4 # This code is free software; you can redistribute it and/or modify it
5 # under the terms of the GNU General Public License version 2 only, as
6 # published by the Free Software Foundation. Oracle designates this
7 # particular file as subject to the "Classpath" exception as provided
8 # by Oracle in the LICENSE file that accompanied this code.
9 #
10 # This code is distributed in the hope that it will be useful, but WITHOUT
11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 # version 2 for more details (a copy is included in the LICENSE file that
14 # accompanied this code).
15 #
16 # You should have received a copy of the GNU General Public License version
17 # 2 along with this work; if not, write to the Free Software Foundation,
18 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 #
20 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 # or visit www.oracle.com if you need additional information or have any
22 # questions.
23 #
24 # <pre>
25 # This file is in the public domain, so clarified as of
26 # 2009-05-17 by Arthur David Olson.
27
28 # also includes Central America and the Caribbean
29
30 # This data is by no means authoritative; if you think you know better,
31 # go ahead and edit the file (and please send any changes to
32 # tz@iana.org for general use in the future).
33
34 # From Paul Eggert (1999-03-22):
35 # A reliable and entertaining source about time zones is
36 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
37
38 ###############################################################################
39
40 # United States
41
42 # From Paul Eggert (1999-03-31):
43 # Howse writes (pp 121-125) that time zones were invented by
44 # Professor Charles Ferdinand Dowd (1825-1904),
45 # Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
46 # His pamphlet "A System of National Time for Railroads" (1870)
47 # was the result of his proposals at the Convention of Railroad Trunk Lines
48 # in New York City (1869-10). His 1870 proposal was based on Washington, DC,
49 # but in 1872-05 he moved the proposed origin to Greenwich.
50 # His proposal was adopted by the railroads on 1883-11-18 at 12:00,
51 # and the most of the country soon followed suit.
52
65 # Daylight Saving Time was first suggested as a joke by Benjamin Franklin
66 # in his whimsical essay "An Economical Project for Diminishing the Cost
67 # of Light" published in the Journal de Paris (1784-04-26).
68 # Not everyone is happy with the results:
69 #
70 # I don't really care how time is reckoned so long as there is some
71 # agreement about it, but I object to being told that I am saving
72 # daylight when my reason tells me that I am doing nothing of the kind.
73 # I even object to the implication that I am wasting something
74 # valuable if I stay in bed after the sun has risen. As an admirer
75 # of moonlight I resent the bossy insistence of those who want to
76 # reduce my time for enjoying it. At the back of the Daylight Saving
77 # scheme I detect the bony, blue-fingered hand of Puritanism, eager
78 # to push people into bed earlier, and get them up earlier, to make
79 # them healthy, wealthy and wise in spite of themselves.
80 #
81 # -- Robertson Davies, The diary of Samuel Marchbanks,
82 # Clarke, Irwin (1947), XIX, Sunday
83 #
84 # For more about the first ten years of DST in the United States, see
85 # Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html">
86 # Ten years of daylight saving from the Pittsburgh standpoint
87 # (Carnegie Library of Pittsburgh, 1927)</a>.
88 #
89 # Shanks says that DST was called "War Time" in the US in 1918 and 1919.
90 # However, DST was imposed by the Standard Time Act of 1918, which
91 # was the first nationwide legal time standard, and apparently
92 # time was just called "Standard Time" or "Daylight Saving Time".
93
94 # From Arthur David Olson:
95 # US Daylight Saving Time ended on the last Sunday of *October* in 1974.
96 # See, for example, the front page of the Saturday, 1974-10-26
97 # and Sunday, 1974-10-27 editions of the Washington Post.
98
99 # From Arthur David Olson:
100 # Before the Uniform Time Act of 1966 took effect in 1967, observance of
101 # Daylight Saving Time in the US was by local option, except during wartime.
102
103 # From Arthur David Olson (2000-09-25):
104 # Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama.
105 # In the introduction, Oboler spoke of "Eastern Peace Time."
106 # An AltaVista search turned up
107 # <a href="http://rowayton.org/rhs/hstaug45.html">:
108 # "When the time is announced over the radio now, it is 'Eastern Peace
109 # Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful."
110 # </a> (August 1945) by way of confirmation.
111
112 # From Joseph Gallant citing
113 # George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
114 # At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
115 # to switch to London for Attlee's address, but the American people
116 # never got to hear his speech live. According to one press account,
117 # CBS' Bob Trout was first to announce the word of Japan's surrender,
118 # but a few seconds later, NBC, ABC and Mutual also flashed the word
119 # of surrender, all of whom interrupting the bells of Big Ben in
120 # London which were to precede Mr. Attlee's speech.
121
122 # From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From
123 # Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times:
124 #
125 # ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender.
126 # Any announcement from Asia would reach St. John's New York newsroom on a
127 # wire service teletype machine, which had prescribed signals for major news.
128 # Associated Press, for example, would ring five bells before spewing out
129 # typed copy of an important story, and 10 bells for news "of transcendental
130 # importance."
188 # ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
189 # The YST zone now covers nearly all of the state, AHST just part
190 # of the Aleutian islands. No DST.
191
192 # From Paul Eggert (1995-12-19):
193 # The tables below use 'NST', not 'NT', for Nome Standard Time.
194 # I invented 'CAWT' for Central Alaska War Time.
195
196 # From U. S. Naval Observatory (1989-01-19):
197 # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
198 # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
199 # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
200 # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
201 # USA MOUNTAIN 7 H BEHIND UTC DENVER
202 # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
203 # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
204 # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
205 # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
206 # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
207 # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
208 # USA - " - 9 H BEHIND UTC APR 3 - OCT 30
209 # USA HAWAII 10 H BEHIND UTC
210 # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
211
212 # From Arthur David Olson (1989-01-21):
213 # The above dates are for 1988.
214 # Note the "AKST" and "AKDT" abbreviations, the claim that there's
215 # no DST in Samoa, and the claim that there is DST in Alaska and the
216 # Aleutians.
217
218 # From Arthur David Olson (1988-02-13):
219 # Legal standard time zone names, from United States Code (1982 Edition and
220 # Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
221 # up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
222 # took effect), as explained in sections 263 and 261:
223 # (none)
224 # United States standard eastern time
225 # United States standard mountain time
226 # United States standard central time
227 # United States standard Pacific time
228 # (none)
241 # And after 1983-11-30:
242 # Atlantic standard time
243 # eastern standard time
244 # central standard time
245 # mountain standard time
246 # Pacific standard time
247 # Alaska standard time
248 # Hawaii-Aleutian standard time
249 # Samoa standard time
250 # The law doesn't give abbreviations.
251 #
252 # From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
253 # Public law 106-564 (2000-12-23) introduced the abbreviation
254 # "Chamorro Standard Time" for time in Guam and the Northern Marianas.
255 # See the file "australasia".
256
257 # From Arthur David Olson, 2005-08-09
258 # The following was signed into law on 2005-08-08.
259 #
260 # H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
261 # (a) Amendment- Section 3(a) of the Uniform Time Act of 1966 (15
262 # U.S.C. 260a(a)) is amended--
263 # (1) by striking 'first Sunday of April' and inserting 'second
264 # Sunday of March'; and
265 # (2) by striking 'last Sunday of October' and inserting 'first
266 # Sunday of November'.
267 # (b) Effective Date- Subsection (a) shall take effect 1 year after the
268 # date of enactment of this Act or March 1, 2007, whichever is later.
269 # (c) Report to Congress- Not later than 9 months after the effective
270 # date stated in subsection (b), the Secretary shall report to Congress
271 # on the impact of this section on energy consumption in the United
272 # States.
273 # (d) Right to Revert- Congress retains the right to revert the
274 # Daylight Saving Time back to the 2005 time schedules once the
275 # Department study is complete.
276
277 # US eastern time, represented by New York
278
279 # Connecticut, Delaware, District of Columbia, most of Florida,
280 # Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky
281 # (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts,
282 # New Hampshire, New Jersey, New York, North Carolina, Ohio,
283 # Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
284 # Vermont, Virginia, West Virginia
285
286 # From Dave Cantor (2004-11-02):
287 # Early this summer I had the occasion to visit the Mount Washington
288 # Observatory weather station atop (of course!) Mount Washington [, NH]....
289 # One of the staff members said that the station was on Eastern Standard Time
290 # and didn't change their clocks for Daylight Saving ... so that their
291 # reports will always have times which are 5 hours behind UTC.
292
293 # From Paul Eggert (2005-08-26):
294 # According to today's Huntsville Times
295 # <http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1>
296 # a few towns on Alabama's "eastern border with Georgia, such as Phenix City
297 # in Russell County, Lanett in Chambers County and some towns in Lee County,
298 # set their watches and clocks on Eastern time." It quotes H.H. "Bubba"
299 # Roberts, city administrator in Phenix City. as saying "We are in the Central
300 # time zone, but we do go by the Eastern time zone because so many people work
301 # in Columbus."
302
303 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
304 Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
305 Rule NYC 1920 only - Oct lastSun 2:00 0 S
306 Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
307 Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
308 Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
309 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
310 Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58
311 -5:00 US E%sT 1920
312 -5:00 NYC E%sT 1942
313 -5:00 US E%sT 1946
314 -5:00 NYC E%sT 1967
315 -5:00 US E%sT
338 # http://www.legis.state.wi.us/2007/data/acts/07Act3.pdf
339
340 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
341 Rule Chicago 1920 only - Jun 13 2:00 1:00 D
342 Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
343 Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
344 Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
345 Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
346 Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
347 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
348 Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24
349 -6:00 US C%sT 1920
350 -6:00 Chicago C%sT 1936 Mar 1 2:00
351 -5:00 - EST 1936 Nov 15 2:00
352 -6:00 Chicago C%sT 1942
353 -6:00 US C%sT 1946
354 -6:00 Chicago C%sT 1967
355 -6:00 US C%sT
356 # Oliver County, ND switched from mountain to central time on 1992-10-25.
357 Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48
358 -7:00 US M%sT 1992 Oct 25 02:00
359 -6:00 US C%sT
360 # Morton County, ND, switched from mountain to central time on
361 # 2003-10-26, except for the area around Mandan which was already central time.
362 # See <http://dmses.dot.gov/docimages/p63/135818.pdf>.
363 # Officially this switch also included part of Sioux County, and
364 # Jones, Mellette, and Todd Counties in South Dakota;
365 # but in practice these other counties were already observing central time.
366 # See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>.
367 Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21
368 -7:00 US M%sT 2003 Oct 26 02:00
369 -6:00 US C%sT
370
371 # From Josh Findley (2011-01-21):
372 # ...it appears that Mercer County, North Dakota, changed from the
373 # mountain time zone to the central time zone at the last transition from
374 # daylight-saving to standard time (on Nov. 7, 2010):
375 # <a href="http://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm">
376 # http://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm
377 # </a>
378 # <a href="http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html">
379 # http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html
380 # </a>
381
382 # From Andy Lipscomb (2011-01-24):
383 # ...according to the Census Bureau, the largest city is Beulah (although
384 # it's commonly referred to as Beulah-Hazen, with Hazen being the next
385 # largest city in Mercer County). Google Maps places Beulah's city hall
386 # at 4715'51" north, 10146'40" west, which yields an offset of 6h47'07".
387
388 Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
389 -7:00 US M%sT 2010 Nov 7 2:00
390 -6:00 US C%sT
391
392 # US mountain time, represented by Denver
393 #
394 # Colorado, far western Kansas, Montana, western
395 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
396 # New Mexico, southwestern North Dakota,
397 # western South Dakota, far western Texas (El Paso County, Hudspeth County,
398 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
399 #
400 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
401 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
402 Rule Denver 1920 only - Oct lastSun 2:00 0 S
403 Rule Denver 1921 only - May 22 2:00 0 S
404 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
405 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
406 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
431 -8:00 CA P%sT 1967
432 -8:00 US P%sT
433
434 # Alaska
435 # AK%sT is the modern abbreviation for -9:00 per USNO.
436 #
437 # From Paul Eggert (2001-05-30):
438 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
439 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
440 # This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
441 # also a Friday. Include only the time zone part of this transition,
442 # ignoring the switch from Julian to Gregorian, since we can't represent
443 # the Julian calendar.
444 #
445 # As far as we know, none of the exact locations mentioned below were
446 # permanently inhabited in 1867 by anyone using either calendar.
447 # (Yakutat was colonized by the Russians in 1799, but the settlement
448 # was destroyed in 1805 by a Yakutat-kon war party.) However, there
449 # were nearby inhabitants in some cases and for our purposes perhaps
450 # it's best to simply use the official transition.
451 #
452
453 # From Steve Ferguson (2011-01-31):
454 # The author lives in Alaska and many of the references listed are only
455 # available to Alaskan residents.
456 #
457 # <a href="http://www.alaskahistoricalsociety.org/index.cfm?section=discover%20alaska&page=Glimpses%20of%20the%20Past&viewpost=2&ContentId=98">
458 # http://www.alaskahistoricalsociety.org/index.cfm?section=discover%20alaska&page=Glimpses%20of%20the%20Past&viewpost=2&ContentId=98
459 # </a>
460
461 # From Arthur David Olson (2011-02-01):
462 # Here's database-relevant material from the 2001 "Alaska History" article:
463 #
464 # On September 20 [1979]...DOT...officials decreed that on April 27,
465 # 1980, Juneau and other nearby communities would move to Yukon Time.
466 # Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on
467 # Pacific Time.
468 #
469 # ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the
470 # Department's September 1979 decision. Juneau and other communities in
471 # northern Southeast reverted to Pacific Time on October 26.
472 #
473 # On October 28 [1983]...the Metlakatla Indian Community Council voted
474 # unanimously to keep the reservation on Pacific Time.
475 #
476 # According to DOT official Joanne Petrie, Indian reservations are not
477 # bound to follow time zones imposed by neighboring jurisdictions.
478 #
479 # (The last is consistent with how the database now handles the Navajo
480 # Nation.)
481
482 # From Arthur David Olson (2011-02-09):
483 # I just spoke by phone with a staff member at the Metlakatla Indian
484 # Community office (using contact information available at
485 # <a href="http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla">
486 # http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla
487 # </a>).
488 # It's shortly after 1:00 here on the east coast of the United States;
489 # the staffer said it was shortly after 10:00 there. When I asked whether
490 # that meant they were on Pacific time, they said no--they were on their
491 # own time. I asked about daylight saving; they said it wasn't used. I
492 # did not inquire about practices in the past.
493
494 # From Arthur David Olson (2011-08-17):
495 # For lack of better information, assume that Metlakatla's
496 # abandonment of use of daylight saving resulted from the 1983 vote.
497
498 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
499 Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
500 -8:57:41 - LMT 1900 Aug 20 12:00
501 -8:00 - PST 1942
502 -8:00 US P%sT 1946
503 -8:00 - PST 1969
504 -8:00 US P%sT 1980 Apr 27 2:00
505 -9:00 US Y%sT 1980 Oct 26 2:00
506 -8:00 US P%sT 1983 Oct 30 2:00
507 -9:00 US Y%sT 1983 Nov 30
508 -9:00 US AK%sT
509 Zone America/Sitka 14:58:47 - LMT 1867 Oct 18
510 -9:01:13 - LMT 1900 Aug 20 12:00
511 -8:00 - PST 1942
512 -8:00 US P%sT 1946
513 -8:00 - PST 1969
514 -8:00 US P%sT 1983 Oct 30 2:00
515 -9:00 US Y%sT 1983 Nov 30
516 -9:00 US AK%sT
517 Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18
518 -8:46:18 - LMT 1900 Aug 20 12:00
519 -8:00 - PST 1942
520 -8:00 US P%sT 1946
521 -8:00 - PST 1969
522 -8:00 US P%sT 1983 Oct 30 2:00
523 -8:00 - MeST
524 Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
525 -9:18:55 - LMT 1900 Aug 20 12:00
526 -9:00 - YST 1942
527 -9:00 US Y%sT 1946
528 -9:00 - YST 1969
529 -9:00 US Y%sT 1983 Nov 30
530 -9:00 US AK%sT
531 Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
532 -9:59:36 - LMT 1900 Aug 20 12:00
533 -10:00 - CAT 1942
534 -10:00 US CAT/CAWT 1945 Aug 14 23:00u
535 -10:00 US CAT/CAPT 1946 # Peace
536 -10:00 - CAT 1967 Apr
537 -10:00 - AHST 1969
538 -10:00 US AH%sT 1983 Oct 30 2:00
539 -9:00 US Y%sT 1983 Nov 30
540 -9:00 US AK%sT
541 Zone America/Nome 12:58:21 - LMT 1867 Oct 18
542 -11:01:38 - LMT 1900 Aug 20 12:00
543 -11:00 - NST 1942
566 # In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
567 # Historic Preservation Commission, provided this information, which
568 # suggests that Unalaska deviated from statutory time from early 1967
569 # possibly until 1983:
570 #
571 # Minutes of the Unalaska City Council Meeting, January 10, 1967:
572 # "Except for St. Paul and Akutan, Unalaska is the only important
573 # location not on Alaska Standard Time. The following resolution was
574 # made by William Robinson and seconded by Henry Swanson: Be it
575 # resolved that the City of Unalaska hereby goes to Alaska Standard
576 # Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
577 # January 14, Alaska Standard Time.) This resolution was passed with
578 # three votes for and one against."
579
580 # Hawaii
581
582 # From Arthur David Olson (2010-12-09):
583 # "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225
584 # of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09,
585 # the article is available at
586 # <a href="http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf">
587 # http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf
588 # </a>
589 # and indicates that standard time was adopted effective noon, January
590 # 13, 1896 (page 218), that in "1933, the Legislature decreed daylight
591 # saving for the period between the last Sunday of each April and the
592 # last Sunday of each September, but less than a month later repealed the
593 # act," (page 220), that year-round daylight saving time was in effect
594 # from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for
595 # when clocks changed) and that clocks were changed by 30 minutes
596 # effective the second Sunday of June, 1947 (page 219, with no time of
597 # day given for when clocks changed). A footnote for the 1933 changes
598 # cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933)
599 # and Act 163 (approved 21 May 1933)."
600
601 # From Arthur David Olson (2011-01-19):
602 # The following is from "Laws of the Territory of Hawaii Passed by the
603 # Seventeenth Legislature: Regular Session 1933," available (as of
604 # 2011-01-19) at American University's Pence Law Library. Page 85: "Act
605 # 90...At 2 o'clock ante meridian of the last Sunday in April of each
606 # year, the standard time of this Territory shall be advanced one
607 # hour...This Act shall take effect upon its approval. Approved this 26th
608 # day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
609 # Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is
610 # hereby repealed...This Act shall take effect upon its approval, upon
611 # which date the standard time of this Territory shall be restored to
612 # that existing immediately prior to the taking effect of said Act 90.
613 # Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
614 # of the Territory of Hawaii."
615 #
616 # Note that 1933-05-21 was a Sunday.
617 # We're left to guess the time of day when Act 163 was approved; guess noon.
618
619 Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 #Schmitt&Cox
620 -10:30 - HST 1933 Apr 30 2:00 #Laws 1933
621 -10:30 1:00 HDT 1933 May 21 12:00 #Laws 1933+12
622 -10:30 - HST 1942 Feb 09 2:00 #Schmitt&Cox+2
623 -10:30 1:00 HDT 1945 Sep 30 2:00 #Schmitt&Cox+2
624 -10:30 - HST 1947 Jun 8 2:00 #Schmitt&Cox+2
625 -10:00 - HST
626
627 Link Pacific/Honolulu Pacific/Johnston
628
629 # Now we turn to US areas that have diverged from the consensus since 1970.
630
631 # Arizona mostly uses MST.
632
633 # From Paul Eggert (2002-10-20):
634 #
635 # The information in the rest of this paragraph is derived from the
636 # <a href="http://www.dlapr.lib.az.us/links/daylight.htm">
637 # Daylight Saving Time web page (2002-01-23)</a> maintained by the
638 # Arizona State Library, Archives and Public Records.
639 # Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
640 # time, but by federal law railroads, airlines, bus lines, military
641 # personnel, and some engaged in interstate commerce continued to
642 # observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
643 # Gazette says that was the date the law changed, and that 04-01 was
644 # the date the state's clocks would change. In 1945 the State of
645 # Arizona used standard time all year, again with exceptions only as
646 # mandated by federal law. Arizona observed DST in 1967, but Arizona
647 # Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
648 #
649 # Shanks says the 1944 experiment came to an end on 1944-03-17.
650 # Go with the Arizona State Library instead.
651
652 Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42
653 -7:00 US M%sT 1944 Jan 1 00:01
654 -7:00 - MST 1944 Apr 1 00:01
655 -7:00 US M%sT 1944 Oct 1 00:01
656 -7:00 - MST 1967
657 -7:00 US M%sT 1968 Mar 21
658 -7:00 - MST
659 # From Arthur David Olson (1988-02-13):
660 # A writer from the Inter Tribal Council of Arizona, Inc.,
661 # notes in private correspondence dated 1987-12-28 that "Presently, only the
662 # Navajo Nation participates in the Daylight Saving Time policy, due to its
663 # large size and location in three states." (The "only" means that other
664 # tribal nations don't use DST.)
665 #
666 # From Paul Eggert (2013-08-26):
667 # See America/Denver for a zone appropriate for the Navajo Nation.
668
669 # Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
670 # Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
671 # Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
672 # Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
673 # Teton, Twin Falls, Valley, Washington counties, and the southern
674 # quarter of Idaho county) and eastern Oregon (most of Malheur County)
675 # switched four weeks late in 1974.
676 #
677 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
678 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
679 -8:00 US P%sT 1923 May 13 2:00
680 -7:00 US M%sT 1974
681 -7:00 - MST 1974 Feb 3 2:00
682 -7:00 US M%sT
683
684 # Indiana
685 #
686 # For a map of Indiana's time zone regions, see:
687 # <a href="http://www.mccsc.edu/time.html">
688 # What time is it in Indiana?
689 # </a> (2006-03-01)
690 #
691 # From Paul Eggert (2007-08-17):
692 # Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
693 # with the following exceptions:
694 #
695 # - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
696 # Vandenburgh, and Warrick counties have been like America/Chicago.
697 #
698 # - Dearborn and Ohio counties have been like America/New_York.
699 #
700 # - Clark, Floyd, and Harrison counties have been like
701 # America/Kentucky/Louisville.
702 #
703 # - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
704 # and Switzerland counties have their own time zone histories as noted below.
705 #
706 # Shanks partitioned Indiana into 345 regions, each with its own time history,
707 # and wrote "Even newspaper reports present contradictory information."
708 # Those Hoosiers! Such a flighty and changeable people!
709 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
710 #
711 # Other than Indianapolis, the Indiana place names are so nondescript
712 # that they would be ambiguous if we left them at the 'America' level.
713 # So we reluctantly put them all in a subdirectory 'America/Indiana'.
714
715 # From Paul Eggert (2005-08-16):
716 # http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006.
717
718 # From Nathan Stratton Treadway (2006-03-30):
719 # http://www.dot.gov/affairs/dot0406.htm [3705 B]
720 # From Deborah Goldsmith (2006-01-18):
721 # http://dmses.dot.gov/docimages/pdf95/382329_web.pdf [2.9 MB]
722 # From Paul Eggert (2006-01-20):
723 # It says "DOT is relocating the time zone boundary in Indiana to move Starke,
724 # Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
725 # Eastern Time Zone to the Central Time Zone.... The effective date of
726 # this rule is 2:OO a.m. EST Sunday, April 2, 2006, which is the
727 # changeover date from standard time to Daylight Saving Time."
728 # Strictly speaking, this means the affected counties will change their
729 # clocks twice that night, but this obviously is in error. The intent
730 # is that 01:59:59 EST be followed by 02:00:00 CDT.
731
732 # From Gwillim Law (2007-02-10):
733 # The Associated Press has been reporting that Pulaski County, Indiana is
734 # going to switch from Central to Eastern Time on March 11, 2007....
735 # http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL
736
737 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
738 Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
739 Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
740 Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
741 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
742 Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22
743 -6:00 US C%sT 1920
744 -6:00 Indianapolis C%sT 1942
745 -6:00 US C%sT 1946
746 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
747 -5:00 - EST 1957 Sep 29 2:00
748 -6:00 - CST 1958 Apr 27 2:00
749 -5:00 - EST 1969
750 -5:00 US E%sT 1971
882 Rule Louisville 1921 only - May 1 2:00 1:00 D
883 Rule Louisville 1921 only - Sep 1 2:00 0 S
884 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
885 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
886 Rule Louisville 1946 only - Jun 2 2:00 0 S
887 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
888 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
889 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
890 Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
891 -6:00 US C%sT 1921
892 -6:00 Louisville C%sT 1942
893 -6:00 US C%sT 1946
894 -6:00 Louisville C%sT 1961 Jul 23 2:00
895 -5:00 - EST 1968
896 -5:00 US E%sT 1974 Jan 6 2:00
897 -6:00 1:00 CDT 1974 Oct 27 2:00
898 -5:00 US E%sT
899 #
900 # Wayne County, Kentucky
901 #
902 # From
903 # <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml">
904 # Lake Cumberland LIFE
905 # </a> (1999-01-29) via WKYM-101.7:
906 # Clinton County has joined Wayne County in asking the DoT to change from
907 # the Central to the Eastern time zone.... The Wayne County government made
908 # the same request in December. And while Russell County officials have not
909 # taken action, the majority of respondents to a poll conducted there in
910 # August indicated they would like to change to "fast time" also.
911 # The three Lake Cumberland counties are the farthest east of any U.S.
912 # location in the Central time zone.
913 #
914 # From Rich Wales (2000-08-29):
915 # After prolonged debate, and despite continuing deep differences of opinion,
916 # Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
917 # (-0500) time. They won't "fall back" this year. See Sara Shipley,
918 # The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
919 #
920 # From Paul Eggert (2001-07-16):
921 # The final rule was published in the
922 # <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22">
923 # Federal Register 65, 160 (2000-08-17), page 50154-50158.
924 # </a>
925 #
926 Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
927 -6:00 US C%sT 1946
928 -6:00 - CST 1968
929 -6:00 US C%sT 2000 Oct 29 2:00
930 -5:00 US E%sT
931
932
933 # From Rives McDow (2000-08-30):
934 # Here ... are all the changes in the US since 1985.
935 # Kearny County, KS (put all of county on central;
936 # previously split between MST and CST) ... 1990-10
937 # Starke County, IN (from CST to EST) ... 1991-10
938 # Oliver County, ND (from MST to CST) ... 1992-10
939 # West Wendover, NV (from PST TO MST) ... 1999-10
940 # Wayne County, KY (from CST to EST) ... 2000-10
941 #
942 # From Paul Eggert (2001-07-17):
943 # We don't know where the line used to be within Kearny County, KS,
944 # so omit that change for now.
945 # See America/Indiana/Knox for the Starke County, IN change.
946 # See America/North_Dakota/Center for the Oliver County, ND change.
947 # West Wendover, NV officially switched from Pacific to mountain time on
948 # 1999-10-31. See the
949 # <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15">
950 # Federal Register 64, 203 (1999-10-21), page 56705-56707.
951 # </a>
952 # However, the Federal Register says that West Wendover already operated
953 # on mountain time, and the rule merely made this official;
954 # hence a separate tz entry is not needed.
955
956 # Michigan
957 #
958 # From Bob Devine (1988-01-28):
959 # Michigan didn't observe DST from 1968 to 1973.
960 #
961 # From Paul Eggert (1999-03-31):
962 # Shanks writes that Michigan started using standard time on 1885-09-18,
963 # but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
964 # that Detroit kept
965 #
966 # local time until 1900 when the City Council decreed that clocks should
967 # be put back twenty-eight minutes to Central Standard Time. Half the
968 # city obeyed, half refused. After considerable debate, the decision
969 # was rescinded and the city reverted to Sun time. A derisive offer to
970 # erect a sundial in front of the city hall was referred to the
971 # Committee on Sewers. Then, in 1905, Central time was adopted
1025 # From Paul Eggert (2006-03-22):
1026 # A good source for time zone historical data outside the U.S. is
1027 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
1028 # San Diego: ACS Publications, Inc. (2003).
1029 #
1030 # Gwillim Law writes that a good source
1031 # for recent time zone data is the International Air Transport
1032 # Association's Standard Schedules Information Manual (IATA SSIM),
1033 # published semiannually. Law sent in several helpful summaries
1034 # of the IATA's data after 1990.
1035 #
1036 # Except where otherwise noted, Shanks & Pottenger is the source for
1037 # entries through 1990, and IATA SSIM is the source for entries afterwards.
1038 #
1039 # Other sources occasionally used include:
1040 #
1041 # Edward W. Whitman, World Time Differences,
1042 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
1043 # which I found in the UCLA library.
1044 #
1045 # <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf">
1046 # William Willett, The Waste of Daylight, 19th edition
1047 # </a> (1914-03)
1048 #
1049 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
1050 # <http://www.jstor.org/stable/1774359>.
1051 #
1052 # See the 'europe' file for Greenland.
1053
1054 # Canada
1055
1056 # From Alain LaBont<e'> (1994-11-14):
1057 # I post here the time zone abbreviations standardized in Canada
1058 # for both English and French in the CAN/CSA-Z234.4-89 standard....
1059 #
1060 # UTC Standard time Daylight savings time
1061 # offset French English French English
1062 # -2:30 - - HAT NDT
1063 # -3 - - HAA ADT
1064 # -3:30 HNT NST - -
1065 # -4 HNA AST HAE EDT
1066 # -5 HNE EST HAC CDT
1067 # -6 HNC CST HAR MDT
1068 # -7 HNR MST HAP PDT
1069 # -8 HNP PST HAY YDT
1070 # -9 HNY YST - -
1071 #
1072 # HN: Heure Normale ST: Standard Time
1073 # HA: Heure Avanc<e'>e DT: Daylight saving Time
1074 #
1075 # A: de l'Atlantique Atlantic
1076 # C: du Centre Central
1077 # E: de l'Est Eastern
1078 # M: Mountain
1079 # N: Newfoundland
1080 # P: du Pacifique Pacific
1081 # R: des Rocheuses
1082 # T: de Terre-Neuve
1083 # Y: du Yukon Yukon
1084 #
1085 # From Paul Eggert (1994-11-22):
1086 # Alas, this sort of thing must be handled by localization software.
1087
1088 # Unless otherwise specified, the data for Canada are all from Shanks
1089 # & Pottenger.
1090
1091 # From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
1092 # 2007-03-01):
1093 # The British Columbia government announced yesterday that it will
1094 # adjust daylight savings next year to align with changes in the
1095 # U.S. and the rest of Canada....
1096 # http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
1097 # ...
1098 # Nova Scotia
1099 # Daylight saving time will be extended by four weeks starting in 2007....
1100 # http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf
1101 #
1102 # [For New Brunswick] the new legislation dictates that the time change is to
1103 # be done at 02:00 instead of 00:01.
1104 # http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
1105 # ...
1106 # Manitoba has traditionally changed the clock every fall at 03:00.
1107 # As of 2006, the transition is to take place one hour earlier at 02:00.
1108 # http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
1117 # ...
1118 # Province of Newfoundland and Labrador....
1119 # http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
1120 # ...
1121 # Yukon
1122 # http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
1123 # ...
1124 # N.W.T. will follow US rules. Whoever maintains the government web site
1125 # does not seem to believe in bookmarks. To see the news release, click the
1126 # following link and search for "Daylight Savings Time Change". Press the
1127 # "Daylight Savings Time Change" link; it will fire off a popup using
1128 # JavaScript.
1129 # http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
1130 # ...
1131 # Nunavut
1132 # An amendment to the Interpretation Act was registered on February 19/2007....
1133 # http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
1134
1135 # From Paul Eggert (2006-04-25):
1136 # H. David Matthews and Mary Vincent's map
1137 # <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp">
1138 # "It's about TIME", _Canadian Geographic_ (September-October 1998)
1139 # </a> contains detailed boundaries for regions observing nonstandard
1140 # time and daylight saving time arrangements in Canada circa 1998.
1141 #
1142 # INMS, the Institute for National Measurement Standards in Ottawa, has <a
1143 # href="http://inms-ienm.nrc-cnrc.gc.ca/en/time_services/daylight_saving_e.php">
1144 # information about standard and daylight saving time zones in Canada.
1145 # </a> (updated periodically).
1146 # Its unofficial information is often taken from Matthews and Vincent.
1147
1148 # From Paul Eggert (2006-06-27):
1149 # For now, assume all of DST-observing Canada will fall into line with the
1150 # new US DST rules,
1151
1152 # From Chris Walton (2011-12-01)
1153 # In the first of Tammy Hardwick's articles
1154 # <a href="http://www.ilovecreston.com/?p=articles&t=spec&ar=260">
1155 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1156 # </a>
1157 # she quotes the Friday November 1/1918 edition of the Creston Review.
1158 # The quote includes these two statements:
1159 # 'Sunday the CPR went back to the old system of time...'
1160 # '... The daylight saving scheme was dropped all over Canada at the same time,'
1161 # These statements refer to a transition from daylight time to standard time
1162 # that occurred nationally on Sunday October 27/1918. This transition was
1163 # also documented in the Saturday October 26/1918 edition of the Toronto Star.
1164
1165 # In light of that evidence, we alter the date from the earlier believed
1166 # Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day
1167 # than Thursday) in all Canadian rulesets.
1168
1169 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1170 Rule Canada 1918 only - Apr 14 2:00 1:00 D
1171 Rule Canada 1918 only - Oct 27 2:00 0 S
1172 Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
1173 Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
1174 Rule Canada 1945 only - Sep 30 2:00 0 S
1175 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
1176 Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
1204 # 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
1205 # but go with Shanks & Pottenger and assume they used Canadian rules.
1206 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
1207 # Apr 30 - Sep 24; go with Shanks & Pottenger.
1208 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
1209 Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
1210 Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
1211 Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
1212 Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
1213 # From Paul Eggert (2000-10-02):
1214 # INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
1215 # at 00:01 local time. For now, assume it started in 1987.
1216
1217 # From Michael Pelley (2011-09-12):
1218 # We received today, Monday, September 12, 2011, notification that the
1219 # changes to the Newfoundland Standard Time Act have been proclaimed.
1220 # The change in the Act stipulates that the change from Daylight Savings
1221 # Time to Standard Time and from Standard Time to Daylight Savings Time
1222 # now occurs at 2:00AM.
1223 # ...
1224 # <a href="http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm">
1225 # http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm
1226 # </a>
1227 # ...
1228 # MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery
1229 # Office of the Chief Information Officer
1230 # Executive Council
1231 # Government of Newfoundland & Labrador
1232
1233 Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
1234 Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S
1235 Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
1236 Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D
1237 Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D
1238 Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S
1239 #
1240 # St John's has an apostrophe, but Posix file names can't have apostrophes.
1241 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1242 Zone America/St_Johns -3:30:52 - LMT 1884
1243 -3:30:52 StJohns N%sT 1918
1244 -3:30:52 Canada N%sT 1919
1245 -3:30:52 StJohns N%sT 1935 Mar 30
1246 -3:30 StJohns N%sT 1942 May 11
1362 -4:00 Canada A%sT 1946
1363 -4:00 Moncton A%sT 1973
1364 -4:00 Canada A%sT 1993
1365 -4:00 Moncton A%sT 2007
1366 -4:00 Canada A%sT
1367
1368 # Quebec
1369
1370 # From Paul Eggert (2013-08-30):
1371 # Since 1970 most of Quebec has been like Toronto.
1372 # However, because earlier versions of the tz database mistakenly relied on data
1373 # from Shanks & Pottenger saying that Quebec differed from Ontario after 1970,
1374 # a separate entry was created for most of Quebec. We're loath to lose
1375 # its pre-1970 info, even though the tz database is normally limited to
1376 # zones that differ after 1970, so keep this otherwise out-of-scope entry.
1377
1378 # Matthews and Vincent (1998) also write that Quebec east of the -63
1379 # meridian is supposed to observe AST, but residents as far east as
1380 # Natashquan use EST/EDT, and residents east of Natashquan use AST.
1381 # The Quebec department of justice writes in
1382 # "The situation in Minganie and Basse-Cote-Nord"
1383 # http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm
1384 # that the coastal strip from just east of Natashquan to Blanc-Sablon
1385 # observes Atlantic standard time all year round.
1386 # http://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en
1387 # says this common practice was codified into law as of 2007.
1388 # For lack of better info, guess this practice began around 1970, contra to
1389 # Shanks & Pottenger who have this region observing AST/ADT.
1390 # for post-1970 data America/Puerto_Rico.
1391
1392 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1393 Rule Mont 1917 only - Mar 25 2:00 1:00 D
1394 Rule Mont 1917 only - Apr 24 0:00 0 S
1395 Rule Mont 1919 only - Mar 31 2:30 1:00 D
1396 Rule Mont 1919 only - Oct 25 2:30 0 S
1397 Rule Mont 1920 only - May 2 2:30 1:00 D
1398 Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
1399 Rule Mont 1921 only - May 1 2:00 1:00 D
1400 Rule Mont 1922 only - Apr 30 2:00 1:00 D
1401 Rule Mont 1924 only - May 17 2:00 1:00 D
1402 Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
1403 Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
1404 # The 1927-to-1937 rules can be expressed more simply as
1405 # Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D
1406 # Rule Mont 1927 1937 - Sep lastSat 24:00 0 S
1407 # The rules below avoid use of 24:00
1408 # (which pre-1998 versions of zic cannot handle).
1409 Rule Mont 1927 only - May 1 0:00 1:00 D
1410 Rule Mont 1927 1932 - Sep lastSun 0:00 0 S
1411 Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D
1412 Rule Mont 1932 only - May 1 0:00 1:00 D
1413 Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D
1414 Rule Mont 1933 only - Oct 1 0:00 0 S
1415 Rule Mont 1934 1939 - Sep lastSun 0:00 0 S
1416 Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D
1417 Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
1418 Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
1419 Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
1420 Rule Mont 1957 1973 - Oct lastSun 2:00 0 S
1421
1422 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1423 Zone America/Blanc-Sablon -3:48:28 - LMT 1884
1424 -4:00 Canada A%sT 1970
1425 -4:00 - AST
1426 Zone America/Montreal -4:54:16 - LMT 1884
1427 -5:00 Mont E%sT 1918
1428 -5:00 Canada E%sT 1919
1429 -5:00 Mont E%sT 1942 Feb 9 2:00s
1430 -5:00 Canada E%sT 1946
1431 -5:00 Mont E%sT 1974
1432 -5:00 Canada E%sT
1433
1434 # Ontario
1435
1436 # From Paul Eggert (2006-07-09):
1437 # Shanks & Pottenger write that since 1970 most of Ontario has been like
1438 # Toronto.
1439 # Thunder Bay skipped DST in 1973.
1440 # Many smaller locales did not observe peacetime DST until 1974;
1441 # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1442 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
1443
1444 # From Mark Brader (2003-07-26):
1445 # [According to the Toronto Star] Orillia, Ontario, adopted DST
1446 # effective Saturday, 1912-06-22, 22:00; the article mentions that
1447 # Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
1448 # have already done so. In Orillia DST was to run until Saturday,
1449 # 1912-08-31 (no time mentioned), but it was met with considerable
1450 # hostility from certain segments of the public, and was revoked after
1451 # only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but
1452 # presumably that should be -07-06. (1912-06-19, -07-12; also letters
1453 # earlier in June).
1454 #
1455 # Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
1456
1457 # From Paul Eggert (1997-10-17):
1458 # Mark Brader writes that an article in the 1997-10-14 Toronto Star
1459 # says that Atikokan, Ontario currently does not observe DST,
1460 # but will vote on 11-10 whether to use EST/EDT.
1461 # He also writes that the
1462 # <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
1463 # Ontario Time Act (1990, Chapter T.9)
1464 # </a>
1465 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
1466 # Officially Atikokan is therefore on CST/CDT, and most likely this report
1467 # concerns a non-official time observed as a matter of local practice.
1468 #
1469 # From Paul Eggert (2000-10-02):
1470 # Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
1471 # New Osnaburgh observe CST all year, that Big Trout Lake observes
1472 # CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
1473 # violation of the official Ontario rules.
1474 #
1475 # From Paul Eggert (2006-07-09):
1476 # Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
1477 # 2005-07-21 Chronicle-Journal, which said:
1478 #
1479 # The clocks in Atikokan stay set on standard time year-round.
1480 # This means they spend about half the time on central time and
1481 # the other half on eastern time.
1482 #
1483 # For the most part, the system works, Mayor Dennis Brown said.
1484 #
1523 #
1524 # The one-hour setback will go into effect throughout most of Ontario,
1525 # except in areas like Windsor which remains on standard time all year.
1526 #
1527 # Windsor is, of course, a lot larger than Nipigon.
1528 #
1529 # I only came across this incidentally. I don't know if Windsor began
1530 # observing DST when Detroit did, or in 1974, or on some other date.
1531 #
1532 # By the way, the article continues by noting that:
1533 #
1534 # Some cities in the United States have pushed the deadline back
1535 # three weeks and will change over from daylight saving in October.
1536
1537 # From Arthur David Olson (2010-07-17):
1538 #
1539 # "Standard Time and Time Zones in Canada" appeared in
1540 # The Journal of The Royal Astronomical Society of Canada,
1541 # volume 26, number 2 (February 1932) and, as of 2010-07-17,
1542 # was available at
1543 # <a href="http://adsabs.harvard.edu/full/1932JRASC..26...49S">
1544 # http://adsabs.harvard.edu/full/1932JRASC..26...49S
1545 # </a>
1546 #
1547 # It includes the text below (starting on page 57):
1548 #
1549 # A list of the places in Canada using daylight saving time would
1550 # require yearly revision. From information kindly furnished by
1551 # the provincial governments and by the postmasters in many cities
1552 # and towns, it is found that the following places used daylight sav-
1553 # ing in 1930. The information for the province of Quebec is definite,
1554 # for the other provinces only approximate:
1555 #
1556 # Province Daylight saving time used
1557 # Prince Edward Island Not used.
1558 # Nova Scotia In Halifax only.
1559 # New Brunswick In St. John only.
1560 # Quebec In the following places:
1561 # Montreal Lachine
1562 # Quebec Mont-Royal
1563 # Levis Iberville
1564 # St. Lambert Cap de la Madeleine
1565 # Verdun Loretteville
1566 # Westmount Richmond
1567 # Outremont St. Jerome
1568 # Longueuil Greenfield Park
1569 # Arvida Waterloo
1570 # Chambly-Canton Beaulieu
1571 # Melbourne La Tuque
1572 # St. Theophile Buckingham
1573 # Ontario Used generally in the cities and towns along
1574 # the southerly part of the province. Not
1575 # used in the northwesterlhy part.
1576 # Manitoba Not used.
1577 # Saskatchewan In Regina only.
1578 # Alberta Not used.
1579 # British Columbia Not used.
1580 #
1581 # With some exceptions, the use of daylight saving may be said to be limited
1582 # to those cities and towns lying between Quebec city and Windsor, Ont.
1583
1584 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1585 Rule Toronto 1919 only - Mar 30 23:30 1:00 D
1586 Rule Toronto 1919 only - Oct 26 0:00 0 S
1587 Rule Toronto 1920 only - May 2 2:00 1:00 D
1588 Rule Toronto 1920 only - Sep 26 0:00 0 S
1589 Rule Toronto 1921 only - May 15 2:00 1:00 D
1590 Rule Toronto 1921 only - Sep 15 2:00 0 S
1591 Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
1592 # Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
1593 # was meant.
1594 Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
1595 Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
1659 Zone America/Rainy_River -6:18:16 - LMT 1895
1660 -6:00 Canada C%sT 1940 Sep 29
1661 -6:00 1:00 CDT 1942 Feb 9 2:00s
1662 -6:00 Canada C%sT
1663 Zone America/Atikokan -6:06:28 - LMT 1895
1664 -6:00 Canada C%sT 1940 Sep 29
1665 -6:00 1:00 CDT 1942 Feb 9 2:00s
1666 -6:00 Canada C%sT 1945 Sep 30 2:00
1667 -5:00 - EST
1668
1669
1670 # Manitoba
1671
1672 # From Rob Douglas (2006-04-06):
1673 # the old Manitoba Time Act - as amended by Bill 2, assented to
1674 # March 27, 1987 ... said ...
1675 # "between two o'clock Central Standard Time in the morning of
1676 # the first Sunday of April of each year and two o'clock Central
1677 # Standard Time in the morning of the last Sunday of October next
1678 # following, one hour in advance of Central Standard Time."...
1679 # I believe that the English legislation [of the old time act] had =
1680 # been assented to (March 22, 1967)....
1681 # Also, as far as I can tell, there was no order-in-council varying
1682 # the time of Daylight Saving Time for 2005 and so the provisions of
1683 # the 1987 version would apply - the changeover was at 2:00 Central
1684 # Standard Time (i.e. not until 3:00 Central Daylight Time).
1685
1686 # From Paul Eggert (2006-04-10):
1687 # Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
1688 # starting 1966. Since 02:00s is clearly correct for 1967 on, assume
1689 # it was also 02:00s in 1966.
1690
1691 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1692 Rule Winn 1916 only - Apr 23 0:00 1:00 D
1693 Rule Winn 1916 only - Sep 17 0:00 0 S
1694 Rule Winn 1918 only - Apr 14 2:00 1:00 D
1695 Rule Winn 1918 only - Oct 27 2:00 0 S
1696 Rule Winn 1937 only - May 16 2:00 1:00 D
1697 Rule Winn 1937 only - Sep 26 2:00 0 S
1698 Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
1699 Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
1837 # British Columbia
1838
1839 # From Paul Eggert (2006-03-22):
1840 # Shanks & Pottenger write that since 1970 most of this region has
1841 # been like Vancouver.
1842 # Dawson Creek uses MST. Much of east BC is like Edmonton.
1843 # Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1844
1845 # It seems though that (re: Creston) is not entirely correct:
1846
1847 # From Chris Walton (2011-12-01):
1848 # There are two areas within the Canadian province of British Columbia
1849 # that do not currently observe daylight saving:
1850 # a) The Creston Valley (includes the town of Creston and surrounding area)
1851 # b) The eastern half of the Peace River Regional District
1852 # (includes the cities of Dawson Creek and Fort St. John)
1853
1854 # Earlier this year I stumbled across a detailed article about the time
1855 # keeping history of Creston; it was written by Tammy Hardwick who is the
1856 # manager of the Creston & District Museum. The article was written in May 2009.
1857 # <a href="http://www.ilovecreston.com/?p=articles&t=spec&ar=260">
1858 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1859 # </a>
1860 # According to the article, Creston has not changed its clocks since June 1918.
1861 # i.e. Creston has been stuck on UTC-7 for 93 years.
1862 # Dawson Creek, on the other hand, changed its clocks as recently as April 1972.
1863
1864 # Unfortunately the exact date for the time change in June 1918 remains
1865 # unknown and will be difficult to ascertain. I e-mailed Tammy a few months
1866 # ago to ask if Sunday June 2 was a reasonable guess. She said it was just
1867 # as plausible as any other date (in June). She also said that after writing the
1868 # article she had discovered another time change in 1916; this is the subject
1869 # of another article which she wrote in October 2010.
1870 # <a href="http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56">
1871 # http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56
1872 # </a>
1873
1874 # Here is a summary of the three clock change events in Creston's history:
1875 # 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7)
1876 # Exact date unknown
1877 # 2. Oct 1916: switch to Pacific Standard Time (GMT-8)
1878 # Exact date in October unknown; Sunday October 1 is a reasonable guess.
1879 # 3. June 1918: switch to Pacific Daylight Time (GMT-7)
1880 # Exact date in June unknown; Sunday June 2 is a reasonable guess.
1881 # note#1:
1882 # On Oct 27/1918 when daylight saving ended in the rest of Canada,
1883 # Creston did not change its clocks.
1884 # note#2:
1885 # During WWII when the Federal Government legislated a mandatory clock change,
1886 # Creston did not oblige.
1887 # note#3:
1888 # There is no guarantee that Creston will remain on Mountain Standard Time
1889 # (UTC-7) forever.
1890 # The subject was debated at least once this year by the town Council.
1891 # <a href="http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html">
1892 # http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html
1893 # </a>
1894
1895 # During a period WWII, summer time (Daylight saying) was mandatory in Canada.
1896 # In Creston, that was handled by shifting the area to PST (-8:00) then applying
1897 # summer time to cause the offset to be -7:00, the same as it had been before
1898 # the change. It can be argued that the timezone abbreviation during this
1899 # period should be PDT rather than MST, but that doesn't seem important enough
1900 # (to anyone) to further complicate the rules.
1901
1902 # The transition dates (and times) are guesses.
1903
1904 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1905 Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1906 Rule Vanc 1918 only - Oct 27 2:00 0 S
1907 Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
1908 Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
1909 Rule Vanc 1945 only - Sep 30 2:00 0 S
1910 Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1911 Rule Vanc 1946 only - Oct 13 2:00 0 S
1912 Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1913 Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S
1927 # Northwest Territories, Nunavut, Yukon
1928
1929 # From Paul Eggert (2006-03-22):
1930 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1931 # Mathew Englander (1996-10-07) gives the following refs:
1932 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1933 # c. 7 defines Yukon standard time as UTC-9. This is still valid;
1934 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1935 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1936 # * O.I.C. 1980/02 established DST.
1937 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1938 # Shanks & Pottenger say Yukon's 1973-10-28 switch was at 2:00; go
1939 # with Englander.
1940 # From Chris Walton (2006-06-26):
1941 # Here is a link to the old daylight saving portion of the interpretation
1942 # act which was last updated in 1987:
1943 # http://www.gov.yk.ca/legislation/regs/oic1987_056.pdf
1944
1945 # From Rives McDow (1999-09-04):
1946 # Nunavut ... moved ... to incorporate the whole territory into one time zone.
1947 # <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
1948 # Nunavut moves to single time zone Oct. 31
1949 # </a>
1950 #
1951 # From Antoine Leca (1999-09-06):
1952 # We then need to create a new timezone for the Kitikmeot region of Nunavut
1953 # to differentiate it from the Yellowknife region.
1954
1955 # From Paul Eggert (1999-09-20):
1956 # <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
1957 # Basic Facts: The New Territory
1958 # </a> (1999) reports that Pangnirtung operates on eastern time,
1959 # and that Coral Harbour does not observe DST. We don't know when
1960 # Pangnirtung switched to eastern time; we'll guess 1995.
1961
1962 # From Rives McDow (1999-11-08):
1963 # On October 31, when the rest of Nunavut went to Central time,
1964 # Pangnirtung wobbled. Here is the result of their wobble:
1965 #
1966 # The following businesses and organizations in Pangnirtung use Central Time:
1967 #
1968 # First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
1969 # Eastern Arctic National Parks, A & D Specialist
1970 #
1971 # The following businesses and organizations in Pangnirtung use Eastern Time:
1972 #
1973 # Hamlet office, All other businesses, Both schools, Airport operator
1974 #
1975 # This has made for an interesting situation there, which warranted the news.
1976 # No one there that I spoke with seems concerned, or has plans to
1977 # change the local methods of keeping time, as it evidently does not
1978 # really interfere with any activities or make things difficult locally.
1979 # They plan to celebrate New Year's turn-over twice, one hour apart,
1980 # so it appears that the situation will last at least that long.
1981 # The Nunavut Intergovernmental Affairs hopes that they will "come to
1982 # their senses", but the locals evidently don't see any problem with
1983 # the current state of affairs.
1984
1985 # From Michaela Rodrigue, writing in the
1986 # <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html">
1987 # Nunatsiaq News (1999-11-19)</a>:
1988 # Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
1989 # central - or Nunavut time - for government offices, and eastern time
1990 # for municipal offices and schools.... Igloolik [was similar but then]
1991 # made the switch to central time on Saturday, Nov. 6.
1992
1993 # From Paul Eggert (2000-10-02):
1994 # Matthews and Vincent (1998) say the following, but we lack histories
1995 # for these potential new Zones.
1996 #
1997 # The Canadian Forces station at Alert uses Eastern Time while the
1998 # handful of residents at the Eureka weather station [in the Central
1999 # zone] skip daylight savings. Baffin Island, which is crossed by the
2000 # Central, Eastern and Atlantic Time zones only uses Eastern Time.
2001 # Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
2002 # Central Time and Southampton Island [in the Central zone] is not
2003 # required to use daylight savings.
2004
2005 # From
2006 # <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html">
2007 # Nunavut now has two time zones
2008 # </a> (2000-11-10):
2009 # The Nunavut government would allow its employees in Kugluktuk and
2010 # Cambridge Bay to operate on central time year-round, putting them
2011 # one hour behind the rest of Nunavut for six months during the winter.
2012 # At the end of October the two communities had rebelled against
2013 # Nunavut's unified time zone, refusing to shift to eastern time with
2014 # the rest of the territory for the winter. Cambridge Bay remained on
2015 # central time, while Kugluktuk, even farther west, reverted to
2016 # mountain time, which they had used before the advent of Nunavut's
2017 # unified time zone in 1999.
2018 #
2019 # From Rives McDow (2001-01-20), quoting the Nunavut government:
2020 # The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
2021
2022 # From Paul Eggert (2000-12-04):
2023 # Let's just keep track of the official times for now.
2024
2025 # From Rives McDow (2001-03-07):
2026 # The premier of Nunavut has issued a ministerial statement advising
2027 # that effective 2001-04-01, the territory of Nunavut will revert
2028 # back to three time zones (mountain, central, and eastern). Of the
2079 # phoned the Resolute Bay hamlet office...[D]ue to the challenging nature
2080 # of the phone call, I decided to seek out an alternate source of
2081 # information. I found an e-mail address for somebody by the name of
2082 # Stephanie Adams whose job was listed as "Inns North Support Officer for
2083 # Arctic Co-operatives." I was under the impression that Stephanie lived
2084 # and worked in Resolute Bay...
2085 #
2086 # On March 14/2011 I phoned the hamlet office again. I was told that
2087 # Resolute Bay had been using Central Standard Time over the winter of
2088 # 2010-2011 and that the clocks had therefore been moved one hour ahead
2089 # on March 13/2011. The person I talked to was aware that Resolute Bay
2090 # had previously experimented with Eastern Standard Time but he could not
2091 # tell me when the practice had stopped.
2092 #
2093 # On March 17/2011 I searched the Web to find an e-mail address of
2094 # somebody that might be able to tell me exactly when Resolute Bay went
2095 # off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz
2096 # used to be the mayor of Resolute Bay and he apparently owns half the
2097 # businesses including "South Camp Inn." This website has some info on
2098 # Aziz:
2099 # <a href="http://www.uphere.ca/node/493">
2100 # http://www.uphere.ca/node/493
2101 # </a>
2102 #
2103 # I sent Aziz an e-mail asking when Resolute Bay had stopped using
2104 # Eastern Standard Time.
2105 #
2106 # Aziz responded quickly with this: "hi, The time was not changed for the
2107 # 1 year only, the following year, the community went back to the old way
2108 # of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in
2109 # the winter Zulu plus 6 hrs"
2110 #
2111 # This of course conflicted with everything I had ascertained in November 2008.
2112 #
2113 # I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz
2114 # responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You
2115 # may want to check with the weather office in Resolute Bay or do a
2116 # search on the weather through Env. Canada. web site"
2117 #
2118 # If I had realized the Stephanie did not live in Resolute Bay I would
2119 # never have contacted her. I now believe that all the information I
2120 # obtained in November 2008 should be ignored...
2121 # I apologize for reporting incorrect information in 2008.
2171 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
2172 -7:00 NT_YK M%sT 1980
2173 -7:00 Canada M%sT
2174 Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
2175 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
2176 -8:00 NT_YK P%sT 1980
2177 -8:00 Canada P%sT
2178 Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
2179 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
2180 -8:00 NT_YK P%sT 1980
2181 -8:00 Canada P%sT
2182
2183
2184 ###############################################################################
2185
2186 # Mexico
2187
2188 # From Paul Eggert (2001-03-05):
2189 # The Investigation and Analysis Service of the
2190 # Mexican Library of Congress (MLoC) has published a
2191 # <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/">
2192 # history of Mexican local time (in Spanish)
2193 # </a>.
2194 #
2195 # Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
2196 # (In all cases we go with the MLoC.)
2197 # S&P report that Baja was at -8:00 in 1922/1923.
2198 # S&P say the 1930 transition in Baja was 1930-11-16.
2199 # S&P report no DST during summer 1931.
2200 # S&P report a transition at 1932-03-30 23:00, not 1932-04-01.
2201
2202 # From Gwillim Law (2001-02-20):
2203 # There are some other discrepancies between the Decrees page and the
2204 # tz database. I think they can best be explained by supposing that
2205 # the researchers who prepared the Decrees page failed to find some of
2206 # the relevant documents.
2207
2208 # From Alan Perry (1996-02-15):
2209 # A guy from our Mexico subsidiary finally found the Presidential Decree
2210 # outlining the timezone changes in Mexico.
2211 #
2212 # ------------- Begin Forwarded Message -------------
2213 #
2218 # - Baja California Norte (the Mexico/BajaNorte TZ)
2219 # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
2220 # - The rest of the country (the Mexico/General TZ)
2221 #
2222 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
2223 # at 2:00 AM, the times in each zone are as follows:
2224 # BajaNorte: GMT+7
2225 # BajaSur: GMT+6
2226 # General: GMT+5
2227 #
2228 # 3. The rest of the year, the times are as follows:
2229 # BajaNorte: GMT+8
2230 # BajaSur: GMT+7
2231 # General: GMT+6
2232 #
2233 # The Decree was published in Mexico's Official Newspaper on January 4th.
2234 #
2235 # -------------- End Forwarded Message --------------
2236 # From Paul Eggert (1996-06-12):
2237 # For an English translation of the decree, see
2238 # <a href="http://mexico-travel.com/extra/timezone_eng.html">
2239 # "Diario Oficial: Time Zone Changeover" (1996-01-04).
2240 # </a>
2241
2242 # From Rives McDow (1998-10-08):
2243 # The State of Quintana Roo has reverted back to central STD and DST times
2244 # (i.e. UTC -0600 and -0500 as of 1998-08-02).
2245
2246 # From Rives McDow (2000-01-10):
2247 # Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
2248 # zone 5 hours from the International Date Line, and will not observe daylight
2249 # savings time so as to stay on the same time zone as the southern part of
2250 # Arizona year round.
2251
2252 # From Jesper Norgaard, translating
2253 # <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
2254 # In Oaxaca, the 55.000 teachers from the Section 22 of the National
2255 # Syndicate of Education Workers, refuse to apply daylight saving each
2256 # year, so that the more than 10,000 schools work at normal hour the
2257 # whole year.
2258
2259 # From Gwillim Law (2001-01-19):
2260 # <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
2261 # (translated):...
2262 # January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
2263 # that Summer Time will be reduced from seven to five months, starting
2264 # this year....
2265 # <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001>
2266 # [translated], says "summer time will ... take effect on the first Sunday
2267 # in May, and end on the last Sunday of September.
2268
2269 # From Arthur David Olson (2001-01-25):
2270 # The 2001-01-24 traditional Washington Post contained the page one
2271 # story "Timely Issue Divides Mexicans."...
2272 # http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
2273 # ... Mexico City Mayor Lopez Obrador "...is threatening to keep
2274 # Mexico City and its 20 million residents on a different time than
2275 # the rest of the country..." In particular, Lopez Obrador would abolish
2276 # observation of Daylight Saving Time.
2277
2278 # <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre">
2279 # Official statute published by the Energy Department
2280 # </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
2281 # and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03).
2282
2283 # From Paul Eggert (2001-03-03):
2284 #
2285 # <a href="http://www.latimes.com/news/nation/20010303/t000018766.html">
2286 # James F. Smith writes in today's LA Times
2287 # </a>
2288 # * Sonora will continue to observe standard time.
2289 # * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that
2290 # the Federal District will not adopt DST.
2291 # * 4 of 16 district leaders announced they'll ignore the decree.
2292 # * The decree does not affect federal-controlled facilities including
2293 # the airport, banks, hospitals, and schools.
2294 #
2295 # For now we'll assume that the Federal District will bow to federal rules.
2296
2297 # From Jesper Norgaard (2001-04-01):
2298 # I found some references to the Mexican application of daylight
2299 # saving, which modifies what I had already sent you, stating earlier
2300 # that a number of northern Mexican states would go on daylight
2301 # saving. The modification reverts this to only cover Baja California
2302 # (Norte), while all other states (except Sonora, who has no daylight
2303 # saving all year) will follow the original decree of president
2304 # Vicente Fox, starting daylight saving May 6, 2001 and ending
2305 # September 30, 2001.
2306 # References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp>
2307 # Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
2308
2309 # From Reuters (2001-09-04):
2310 # Mexico's Supreme Court on Tuesday declared that daylight savings was
2311 # unconstitutional in Mexico City, creating the possibility the
2312 # capital will be in a different time zone from the rest of the nation
2313 # next year.... The Supreme Court's ruling takes effect at 2:00
2314 # a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
2315 # standard time. "This is so residents of the Federal District are not
2316 # subject to unexpected time changes," a statement from the court said.
2317
2318 # From Jesper Norgaard Welen (2002-03-12):
2319 # ... consulting my local grocery store(!) and my coworkers, they all insisted
2320 # that a new decision had been made to reinstate US style DST in Mexico....
2321 # http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
2322 # confirms this. Sonora as usual is the only state where DST is not applied.
2323
2324 # From Steffen Thorsen (2009-12-28):
2325 #
2326 # Steffen Thorsen wrote:
2327 # > Mexico's House of Representatives has approved a proposal for northern
2328 # > Mexico's border cities to share the same daylight saving schedule as
2329 # > the United States.
2330 # Now this has passed both the Congress and the Senate, so starting from
2331 # 2010, some border regions will be the same:
2332 # <a href="http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/">
2333 # http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/
2334 # </a>
2335 # <a href="http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939">
2336 # http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939
2337 # </a>
2338 # (Spanish)
2339 #
2340 # Could not find the new law text, but the proposed law text changes are here:
2341 # <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf">
2342 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf
2343 # </a>
2344 # (Gaceta Parlamentaria)
2345 #
2346 # There is also a list of the votes here:
2347 # <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html">
2348 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html
2349 # </a>
2350 #
2351 # Our page:
2352 # <a href="http://www.timeanddate.com/news/time/north-mexico-dst-change.html">
2353 # http://www.timeanddate.com/news/time/north-mexico-dst-change.html
2354 # </a>
2355
2356 # From Arthur David Olson (2010-01-20):
2357 # The page
2358 # <a href="http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010">
2359 # http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
2360 # </a>
2361 # includes this text:
2362 # En los municipios fronterizos de Tijuana y Mexicali en Baja California;
2363 # Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila;
2364 # Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en
2365 # Tamaulipas, la aplicación de este horario estacional surtirá efecto
2366 # desde las dos horas del segundo domingo de marzo y concluirá a las dos
2367 # horas del primer domingo de noviembre.
2368 # En los municipios fronterizos que se encuentren ubicados en la franja
2369 # fronteriza norte en el territorio comprendido entre la línea
2370 # internacional y la línea paralela ubicada a una distancia de veinte
2371 # kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el
2372 # interior del país, la aplicación de este horario estacional surtirá
2373 # efecto desde las dos horas del segundo domingo de marzo y concluirá a
2374 # las dos horas del primer domingo de noviembre.
2375
2376 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2377 Rule Mexico 1939 only - Feb 5 0:00 1:00 D
2378 Rule Mexico 1939 only - Jun 25 0:00 0 S
2379 Rule Mexico 1940 only - Dec 9 0:00 1:00 D
2380 Rule Mexico 1941 only - Apr 1 0:00 0 S
2381 Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
2382 Rule Mexico 1944 only - May 1 0:00 0 S
2383 Rule Mexico 1950 only - Feb 12 0:00 1:00 D
2384 Rule Mexico 1950 only - Jul 30 0:00 0 S
2385 Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
2386 Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
2387 Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
2388 Rule Mexico 2001 only - Sep lastSun 2:00 0 S
2389 Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
2390 Rule Mexico 2002 max - Oct lastSun 2:00 0 S
2391 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2392 # Quintana Roo
2393 Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
2394 -6:00 - CST 1981 Dec 23
2395 -5:00 Mexico E%sT 1998 Aug 2 2:00
2396 -6:00 Mexico C%sT
2397 # Campeche, Yucatan
2398 Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
2399 -6:00 - CST 1981 Dec 23
2400 -5:00 - EST 1982 Dec 2
2401 -6:00 Mexico C%sT
2402 # Coahuila, Durango, Nuevo Leon, Tamaulipas (near US border)
2403 Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00
2404 -6:00 - CST 1988
2405 -6:00 US C%sT 1989
2406 -6:00 Mexico C%sT 2010
2407 -6:00 US C%sT
2408 # Coahuila, Durango, Nuevo Leon, Tamaulipas (away from US border)
2409 Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
2410 -6:00 - CST 1988
2411 -6:00 US C%sT 1989
2412 -6:00 Mexico C%sT
2413 # Central Mexico
2414 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
2415 -7:00 - MST 1927 Jun 10 23:00
2416 -6:00 - CST 1930 Nov 15
2417 -7:00 - MST 1931 May 1 23:00
2418 -6:00 - CST 1931 Oct
2419 -7:00 - MST 1932 Apr 1
2420 -6:00 Mexico C%sT 2001 Sep 30 02:00
2421 -6:00 - CST 2002 Feb 20
2422 -6:00 Mexico C%sT
2423 # Chihuahua (near US border)
2424 Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20
2425 -7:00 - MST 1927 Jun 10 23:00
2426 -6:00 - CST 1930 Nov 15
2427 -7:00 - MST 1931 May 1 23:00
2428 -6:00 - CST 1931 Oct
2429 -7:00 - MST 1932 Apr 1
2430 -6:00 - CST 1996
2431 -6:00 Mexico C%sT 1998
2432 -6:00 - CST 1998 Apr Sun>=1 3:00
2433 -7:00 Mexico M%sT 2010
2434 -7:00 US M%sT
2435 # Chihuahua (away from US border)
2436 Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
2437 -7:00 - MST 1927 Jun 10 23:00
2438 -6:00 - CST 1930 Nov 15
2439 -7:00 - MST 1931 May 1 23:00
2440 -6:00 - CST 1931 Oct
2441 -7:00 - MST 1932 Apr 1
2442 -6:00 - CST 1996
2443 -6:00 Mexico C%sT 1998
2444 -6:00 - CST 1998 Apr Sun>=1 3:00
2445 -7:00 Mexico M%sT
2446 # Sonora
2447 Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
2448 -7:00 - MST 1927 Jun 10 23:00
2449 -6:00 - CST 1930 Nov 15
2450 -7:00 - MST 1931 May 1 23:00
2451 -6:00 - CST 1931 Oct
2452 -7:00 - MST 1932 Apr 1
2453 -6:00 - CST 1942 Apr 24
2454 -7:00 - MST 1949 Jan 14
2455 -8:00 - PST 1970
2456 -7:00 Mexico M%sT 1999
2457 -7:00 - MST
2458
2459 # From Alexander Krivenyshev (2010-04-21):
2460 # According to news, Bahía de Banderas (Mexican state of Nayarit)
2461 # changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to
2462 # share the same time zone as nearby city Puerto Vallarta, Jalisco).
2463 #
2464 # (Spanish)
2465 # Bahía de Banderas homologa su horario al del centro del
2466 # país, a partir de este domingo
2467 # <a href="http://www.nayarit.gob.mx/notes.asp?id=20748">
2468 # http://www.nayarit.gob.mx/notes.asp?id=20748
2469 # </a>
2470 #
2471 # Bahía de Banderas homologa su horario con el del Centro del
2472 # País
2473 # <a href="http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50">
2474 # http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50"
2475 # </a>
2476 #
2477 # (English)
2478 # Puerto Vallarta and Bahía de Banderas: One Time Zone
2479 # <a href="http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml">
2480 # http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml
2481 # </a>
2482 #
2483 # or
2484 # <a href="http://www.worldtimezone.com/dst_news/dst_news_mexico08.html">
2485 # http://www.worldtimezone.com/dst_news/dst_news_mexico08.html
2486 # </a>
2487 #
2488 # "Mexico's Senate approved the amendments to the Mexican Schedule System that
2489 # will allow Bahía de Banderas and Puerto Vallarta to share the same time
2490 # zone ..."
2491 # Baja California Sur, Nayarit, Sinaloa
2492
2493 # From Arthur David Olson (2010-05-01):
2494 # Use "Bahia_Banderas" to keep the name to fourteen characters.
2495
2496 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
2497 -7:00 - MST 1927 Jun 10 23:00
2498 -6:00 - CST 1930 Nov 15
2499 -7:00 - MST 1931 May 1 23:00
2500 -6:00 - CST 1931 Oct
2501 -7:00 - MST 1932 Apr 1
2502 -6:00 - CST 1942 Apr 24
2503 -7:00 - MST 1949 Jan 14
2504 -8:00 - PST 1970
2505 -7:00 Mexico M%sT
2506
2507 Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00
2508 -7:00 - MST 1927 Jun 10 23:00
2509 -6:00 - CST 1930 Nov 15
2510 -7:00 - MST 1931 May 1 23:00
2511 -6:00 - CST 1931 Oct
2512 -7:00 - MST 1932 Apr 1
2513 -6:00 - CST 1942 Apr 24
2514 -7:00 - MST 1949 Jan 14
2515 -8:00 - PST 1970
2516 -7:00 Mexico M%sT 2010 Apr 4 2:00
2517 -6:00 Mexico C%sT
2518
2519 # Baja California (near US border)
2520 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
2521 -7:00 - MST 1924
2522 -8:00 - PST 1927 Jun 10 23:00
2523 -7:00 - MST 1930 Nov 15
2524 -8:00 - PST 1931 Apr 1
2525 -8:00 1:00 PDT 1931 Sep 30
2526 -8:00 - PST 1942 Apr 24
2543 -7:00 - MST 1930 Nov 15
2544 -8:00 - PST 1931 Apr 1
2545 -8:00 1:00 PDT 1931 Sep 30
2546 -8:00 - PST 1942 Apr 24
2547 -8:00 1:00 PWT 1945 Aug 14 23:00u
2548 -8:00 1:00 PPT 1945 Nov 12 # Peace
2549 -8:00 - PST 1948 Apr 5
2550 -8:00 1:00 PDT 1949 Jan 14
2551 -8:00 - PST 1954
2552 -8:00 CA P%sT 1961
2553 -8:00 - PST 1976
2554 -8:00 US P%sT 1996
2555 -8:00 Mexico P%sT 2001
2556 -8:00 US P%sT 2002 Feb 20
2557 -8:00 Mexico P%sT
2558 # From Paul Eggert (2006-03-22):
2559 # Formerly there was an America/Ensenada zone, which differed from
2560 # America/Tijuana only in that it did not observe DST from 1976
2561 # through 1995. This was as per Shanks (1999). But Shanks & Pottenger say
2562 # Ensenada did not observe DST from 1948 through 1975. Guy Harris reports
2563 # that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and
2564 # Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
2565 # DST-observance was a town-by-town matter back then. This concerns
2566 # data after 1970 so most likely there should be at least one Zone
2567 # other than America/Tijuana for Baja, but it's not clear yet what its
2568 # name or contents should be.
2569 #
2570 # Revillagigedo Is
2571 # no information
2572
2573 ###############################################################################
2574
2575 # Anguilla
2576 # See 'southamerica'.
2577
2578 # Antigua and Barbuda
2579 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2580 Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
2581 -5:00 - EST 1951
2582 -4:00 - AST
2583
2584 # Bahamas
2585 #
2586 # For 1899 Milne gives -5:09:29.5; round that.
2587 #
2588 # From Sue Williams (2006-12-07):
2589 # The Bahamas announced about a month ago that they plan to change their DST
2590 # rules to sync with the U.S. starting in 2007....
2591 # http://www.jonesbahamas.com/?c=45&a=10412
2592
2593 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2594 Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S
2595 Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D
2596 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2636 # Next year, however, clocks in the US will go forward on the second Sunday
2637 # in March, until the first Sunday in November. And, after the Time Zone
2638 # (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2639 # Friday, the same thing will happen in Bermuda.
2640 # http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2641
2642 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2643 Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton
2644 -4:00 - AST 1974 Apr 28 2:00
2645 -4:00 Canada A%sT 1976
2646 -4:00 US A%sT
2647
2648 # Cayman Is
2649 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2650 Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
2651 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
2652 -5:00 - EST
2653
2654 # Costa Rica
2655
2656 # Milne gives -5:36:13.3 as San Jose mean time; round to nearest.
2657
2658 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2659 Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
2660 Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
2661 Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
2662 # IATA SSIM (1991-09) says the following was at 1:00;
2663 # go with Shanks & Pottenger.
2664 Rule CR 1991 only - Jul 1 0:00 0 S
2665 Rule CR 1992 only - Mar 15 0:00 0 S
2666 # There are too many San Joses elsewhere, so we'll use 'Costa Rica'.
2667 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2668 Zone America/Costa_Rica -5:36:13 - LMT 1890 # San Jose
2669 -5:36:13 - SJMT 1921 Jan 15 # San Jose Mean Time
2670 -6:00 CR C%sT
2671 # Coco
2672 # no information; probably like America/Costa_Rica
2673
2674 # Cuba
2675
2676 # From Paul Eggert (2013-02-21):
2677 # Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57
2678 # for the port, and -5:30 for meteorological observations.
2679 # For now, stick with Shanks & Pottenger.
2680
2681 # From Arthur David Olson (1999-03-29):
2682 # The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
2683 # the Cuban National Team and the Baltimore Orioles was carried live on
2684 # the Orioles Radio Network, including affiliate WTOP in Washington, DC.
2685 # During the game, play-by-play announcer Jim Hunter noted that
2686 # "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
2687 # Time today." (The "two hour" remark referred to losing one hour of
2688 # sleep on 1999-03-28--when the announcers were in Cuba as it switched
2689 # to DST--and one more hour on 1999-04-04--when the announcers will have
2690 # returned to Baltimore, which switches on that date.)
2691
2692 # From Steffen Thorsen (2013-11-11):
2693 # DST start in Cuba in 2004 ... does not follow the same rules as the
2694 # years before. The correct date should be Sunday 2004-03-28 00:00 ...
2695 # https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html
2696
2697 # From Evert van der Veer via Steffen Thorsen (2004-10-28):
2698 # Cuba is not going back to standard time this year.
2699 # From Paul Eggert (2006-03-22):
2700 # http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
2701 # says that it's due to a problem at the Antonio Guiteras
2702 # thermoelectric plant, and says "This October there will be no return
2703 # to normal hours (after daylight saving time)".
2704 # For now, let's assume that it's a temporary measure.
2705
2706 # From Carlos A. Carnero Delgado (2005-11-12):
2707 # This year (just like in 2004-2005) there's no change in time zone
2708 # adjustment in Cuba. We will stay in daylight saving time:
2709 # http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html
2710
2711 # From Jesper Norgaard Welen (2006-10-21):
2712 # An article in GRANMA INTERNACIONAL claims that Cuba will end
2713 # the 3 years of permanent DST next weekend, see
2714 # http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html
2715 # "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
2716 # watches should be set back one hour -- going back to 00:00 hours -- returning
2717 # to the normal schedule....
2718
2719 # From Paul Eggert (2007-03-02):
2720 # http://www.granma.cubaweb.cu/english/news/art89.html, dated yesterday,
2721 # says Cuban clocks will advance at midnight on March 10.
2722 # For lack of better information, assume Cuba will use US rules,
2723 # except that it switches at midnight standard time as usual.
2724 #
2725 # From Steffen Thorsen (2007-10-25):
2726 # Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
2727 # earlier - on the last Sunday of October, just like in 2006.
2728 #
2729 # He supplied these references:
2730 #
2731 # http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES
2732 # http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm
2733 #
2734 # From Alex Kryvenishev (2007-10-25):
2735 # Here is also article from Granma (Cuba):
2736 #
2737 # [Regira] el Horario Normal desde el [proximo] domingo 28 de octubre
2738 # http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
2739 #
2740 # http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
2741
2742 # From Arthur David Olson (2008-03-09):
2743 # I'm in Maryland which is now observing United States Eastern Daylight
2744 # Time. At 9:44 local time I used RealPlayer to listen to
2745 # <a href="http://media.enet.cu/radioreloj">
2746 # http://media.enet.cu/radioreloj
2747 # </a>, a Cuban information station, and heard
2748 # the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
2749 # indicating that Cuba is still on standard time.
2750
2751 # From Steffen Thorsen (2008-03-12):
2752 # It seems that Cuba will start DST on Sunday, 2007-03-16...
2753 # It was announced yesterday, according to this source (in Spanish):
2754 # <a href="http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm">
2755 # http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
2756 # </a>
2757 #
2758 # Some more background information is posted here:
2759 # <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html">
2760 # http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
2761 # </a>
2762 #
2763 # The article also says that Cuba has been observing DST since 1963,
2764 # while Shanks (and tzdata) has 1965 as the first date (except in the
2765 # 1940's). Many other web pages in Cuba also claim that it has been
2766 # observed since 1963, but with the exception of 1970 - an exception
2767 # which is not present in tzdata/Shanks. So there is a chance we need to
2768 # change some historic records as well.
2769 #
2770 # One example:
2771 # <a href="http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm">
2772 # http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
2773 # </a>
2774
2775 # From Jesper Norgaard Welen (2008-03-13):
2776 # The Cuban time change has just been confirmed on the most authoritative
2777 # web site, the Granma. Please check out
2778 # <a href="http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html">
2779 # http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
2780 # </a>
2781 #
2782 # Basically as expected after Steffen Thorsens information, the change
2783 # will take place midnight between Saturday and Sunday.
2784
2785 # From Arthur David Olson (2008-03-12):
2786 # Assume Sun>=15 (third Sunday) going forward.
2787
2788 # From Alexander Krivenyshev (2009-03-04)
2789 # According to the Radio Reloj - Cuba will start Daylight Saving Time on
2790 # midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009-
2791 # not on midnight March 14 / March 15 as previously thought.
2792 #
2793 # <a href="http://www.worldtimezone.com/dst_news/dst_news_cuba05.html">
2794 # http://www.worldtimezone.com/dst_news/dst_news_cuba05.html
2795 # (in Spanish)
2796 # </a>
2797
2798 # From Arthur David Olson (2009-03-09)
2799 # I listened over the Internet to
2800 # <a href="http://media.enet.cu/readioreloj">
2801 # http://media.enet.cu/readioreloj
2802 # </a>
2803 # this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
2804 # the time was announced as "diez cinco"--the same time as here, indicating
2805 # that has indeed switched to DST. Assume second Sunday from 2009 forward.
2806
2807 # From Steffen Thorsen (2011-03-08):
2808 # Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00
2809 # this year. Nothing about the end date known so far (if that has
2810 # changed at all).
2811 #
2812 # Source:
2813 # <a href="http://granma.co.cu/2011/03/08/nacional/artic01.html">
2814 # http://granma.co.cu/2011/03/08/nacional/artic01.html
2815 # </a>
2816 #
2817 # Our info:
2818 # <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html">
2819 # http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html
2820 # </a>
2821 #
2822 # From Steffen Thorsen (2011-10-30)
2823 # Cuba will end DST two weeks later this year. Instead of going back
2824 # tonight, it has been delayed to 2011-11-13 at 01:00.
2825 #
2826 # One source (Spanish)
2827 # <a href="http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html">
2828 # http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html
2829 # </a>
2830 #
2831 # Our page:
2832 # <a href="http://www.timeanddate.com/news/time/cuba-time-changes-2011.html">
2833 # http://www.timeanddate.com/news/time/cuba-time-changes-2011.html
2834 # </a>
2835 #
2836 # From Steffen Thorsen (2012-03-01)
2837 # According to Radio Reloj, Cuba will start DST on Midnight between March
2838 # 31 and April 1.
2839 #
2840 # Radio Reloj has the following info (Spanish):
2841 # <a href="http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril">
2842 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril
2843 # </a>
2844 #
2845 # Our info on it:
2846 # <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html">
2847 # http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html
2848 # </a>
2849
2850 # From Steffen Thorsen (2012-11-03):
2851 # Radio Reloj and many other sources report that Cuba is changing back
2852 # to standard time on 2012-11-04:
2853 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre
2854 # From Paul Eggert (2012-11-03):
2855 # For now, assume the future rule is first Sunday in November.
2856
2857 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2858 Rule Cuba 1928 only - Jun 10 0:00 1:00 D
2859 Rule Cuba 1928 only - Oct 10 0:00 0 S
2860 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
2861 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
2862 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
2863 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
2864 Rule Cuba 1965 only - Jun 1 0:00 1:00 D
2865 Rule Cuba 1965 only - Sep 30 0:00 0 S
2866 Rule Cuba 1966 only - May 29 0:00 1:00 D
2867 Rule Cuba 1966 only - Oct 2 0:00 0 S
2868 Rule Cuba 1967 only - Apr 8 0:00 1:00 D
2884 Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
2885 Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S
2886 Rule Cuba 2000 2003 - Apr Sun>=1 0:00s 1:00 D
2887 Rule Cuba 2004 only - Mar lastSun 0:00s 1:00 D
2888 Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S
2889 Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D
2890 Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D
2891 Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D
2892 Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D
2893 Rule Cuba 2011 only - Nov 13 0:00s 0 S
2894 Rule Cuba 2012 only - Apr 1 0:00s 1:00 D
2895 Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S
2896 Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D
2897
2898 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2899 Zone America/Havana -5:29:28 - LMT 1890
2900 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
2901 -5:00 Cuba C%sT
2902
2903 # Dominica
2904 # See 'southamerica'.
2905
2906 # Dominican Republic
2907
2908 # From Steffen Thorsen (2000-10-30):
2909 # Enrique Morales reported to me that the Dominican Republic has changed the
2910 # time zone to Eastern Standard Time as of Sunday 29 at 2 am....
2911 # http://www.listin.com.do/antes/261000/republica/princi.html
2912
2913 # From Paul Eggert (2000-12-04):
2914 # That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
2915
2916 # From Rives McDow (2000-12-01):
2917 # Dominican Republic changed its mind and presidential decree on Tuesday,
2918 # November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
2919 # Dominican Republic will be reverting to 8 hours from the International Date
2920 # Line, and will not be using DST in the foreseeable future. The reason they
2921 # decided to use DST was to be in synch with Puerto Rico, who was also going
2922 # to implement DST. When Puerto Rico didn't implement DST, the president
2923 # decided to revert.
2924
2925
2926 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2927 Rule DR 1966 only - Oct 30 0:00 1:00 D
2928 Rule DR 1967 only - Feb 28 0:00 0 S
2929 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
2930 Rule DR 1970 only - Feb 21 0:00 0 S
2931 Rule DR 1971 only - Jan 20 0:00 0 S
2932 Rule DR 1972 1974 - Jan 21 0:00 0 S
2933 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2934 Zone America/Santo_Domingo -4:39:36 - LMT 1890
2935 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
2936 -5:00 DR E%sT 1974 Oct 27
2937 -4:00 - AST 2000 Oct 29 02:00
2938 -5:00 US E%sT 2000 Dec 3 01:00
2939 -4:00 - AST
2940
2941 # El Salvador
2942
2943 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2944 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
2945 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
2946 # There are too many San Salvadors elsewhere, so use America/El_Salvador
2947 # instead of America/San_Salvador.
2948 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2949 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
2950 -6:00 Salv C%sT
2951
2952 # Grenada
2953 # Guadeloupe
2954 # St Barthelemy
2955 # St Martin (French part)
2956 # See 'southamerica'.
2957
2958 # Guatemala
2959 #
2960 # From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
2961 # Diario Co Latino, at
2962 # http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079,
2963 # says in an article dated 2006-04-19 that the Guatemalan government had
2964 # decided on that date to advance official time by 60 minutes, to lessen the
2965 # impact of the elevated cost of oil.... Daylight saving time will last from
2966 # 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
2967 # From Paul Eggert (2006-06-22):
2968 # The Ministry of Energy and Mines, press release CP-15/2006
2969 # (2006-04-19), says DST ends at 24:00. See
2970 # <http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf>.
2971
2972 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2973 Rule Guat 1973 only - Nov 25 0:00 1:00 D
2974 Rule Guat 1974 only - Feb 24 0:00 0 S
2975 Rule Guat 1983 only - May 21 0:00 1:00 D
2976 Rule Guat 1983 only - Sep 22 0:00 0 S
2977 Rule Guat 1991 only - Mar 23 0:00 1:00 D
2978 Rule Guat 1991 only - Sep 7 0:00 0 S
2979 Rule Guat 2006 only - Apr 30 0:00 1:00 D
2980 Rule Guat 2006 only - Oct 1 0:00 0 S
2981 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2982 Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
2983 -6:00 Guat C%sT
2984
2985 # Haiti
2986 # From Gwillim Law (2005-04-15):
2987 # Risto O. Nykanen wrote me that Haiti is now on DST.
2988 # I searched for confirmation, and I found a
2989 # <a href="http://www.haitianconsulate.org/time.doc"> press release
2990 # on the Web page of the Haitian Consulate in Chicago (2005-03-31),
2991 # </a>. Translated from French, it says:
2992 #
2993 # "The Prime Minister's Communication Office notifies the public in general
2994 # and the press in particular that, following a decision of the Interior
2995 # Ministry and the Territorial Collectivities [I suppose that means the
2996 # provinces], Haiti will move to Eastern Daylight Time in the night from next
2997 # Saturday the 2nd to Sunday the 3rd.
2998 #
2999 # "Consequently, the Prime Minister's Communication Office wishes to inform
3000 # the population that the country's clocks will be set forward one hour
3001 # starting at midnight. This provision will hold until the last Saturday in
3002 # October 2005.
3003 #
3004 # "Port-au-Prince, March 31, 2005"
3005 #
3006 # From Steffen Thorsen (2006-04-04):
3007 # I have been informed by users that Haiti observes DST this year like
3008 # last year, so the current "only" rule for 2005 might be changed to a
3009 # "max" rule or to last until 2006. (Who knows if they will observe DST
3010 # next year or if they will extend their DST like US/Canada next year).
3011 #
3048 Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
3049 Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
3050 Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S
3051 Rule Haiti 2012 max - Mar Sun>=8 2:00 1:00 D
3052 Rule Haiti 2012 max - Nov Sun>=1 2:00 0 S
3053 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3054 Zone America/Port-au-Prince -4:49:20 - LMT 1890
3055 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
3056 -5:00 Haiti E%sT
3057
3058 # Honduras
3059 # Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.
3060
3061 # From Paul Eggert (2006-05-05):
3062 # worldtimezone.com reports a 2006-05-02 Spanish-language AP article
3063 # saying Honduras will start using DST midnight Saturday, effective 4
3064 # months until September. La Tribuna reported today
3065 # <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president
3066 # of Honduras, refused to back down on this.
3067
3068 # From Jesper Norgaard Welen (2006-08-08):
3069 # It seems that Honduras has returned from DST to standard time this Monday at
3070 # 00:00 hours (prolonging Sunday to 25 hours duration).
3071 # http://www.worldtimezone.com/dst_news/dst_news_honduras04.html
3072
3073 # From Paul Eggert (2006-08-08):
3074 # Also see Diario El Heraldo, The country returns to standard time (2006-08-08)
3075 # <http://www.elheraldo.hn/nota.php?nid=54941&sec=12>.
3076 # It mentions executive decree 18-2006.
3077
3078 # From Steffen Thorsen (2006-08-17):
3079 # Honduras will observe DST from 2007 to 2009, exact dates are not
3080 # published, I have located this authoritative source:
3081 # http://www.presidencia.gob.hn/noticia.aspx?nId=47
3082
3083 # From Steffen Thorsen (2007-03-30):
3084 # http://www.laprensahn.com/pais_nota.php?id04962=7386
3085 # So it seems that Honduras will not enter DST this year....
3086
3087 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3088 Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D
3089 Rule Hond 1987 1988 - Sep lastSun 0:00 0 S
3090 Rule Hond 2006 only - May Sun>=1 0:00 1:00 D
3091 Rule Hond 2006 only - Aug Mon>=1 0:00 0 S
3092 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3093 Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
3094 -6:00 Hond C%sT
3095 #
3098 # Jamaica
3099 # Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
3100 # unspecified official document, and says "This time is used throughout the
3101 # island". Go with Milne. Round to the nearest second as required by zic.
3102 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3103 Zone America/Jamaica -5:07:11 - LMT 1890 # Kingston
3104 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3105 -5:00 - EST 1974 Apr 28 2:00
3106 -5:00 US E%sT 1984
3107 -5:00 - EST
3108
3109 # Martinique
3110 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3111 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
3112 -4:04:20 - FFMT 1911 May # Fort-de-France MT
3113 -4:00 - AST 1980 Apr 6
3114 -4:00 1:00 ADT 1980 Sep 28
3115 -4:00 - AST
3116
3117 # Montserrat
3118 # See 'southamerica'.
3119
3120 # Nicaragua
3121 #
3122 # This uses Shanks & Pottenger for times before 2005.
3123 #
3124 # From Steffen Thorsen (2005-04-12):
3125 # I've got reports from 8 different people that Nicaragua just started
3126 # DST on Sunday 2005-04-10, in order to save energy because of
3127 # expensive petroleum. The exact end date for DST is not yet
3128 # announced, only "September" but some sites also say "mid-September".
3129 # Some background information is available on the President's official site:
3130 # http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
3131 # The Decree, no 23-2005 is available here:
3132 # http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2005/Decreto%2023-2005%20Se%20adelanta%20en%20una%20hora%20en%20todo%20el%20territorio%20nacional%20apartir%20de%20las%2024horas%20del%2009%20de%20Abril.pdf
3133 #
3134 # From Paul Eggert (2005-05-01):
3135 # The decree doesn't say anything about daylight saving, but for now let's
3136 # assume that it is daylight saving....
3137 #
3138 # From Gwillim Law (2005-04-21):
3139 # The Associated Press story on the time change, which can be found at
3140 # http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
3141 # and elsewhere, says (fifth paragraph, translated from Spanish): "The last
3142 # time that a change of clocks was applied to save energy was in the year 2000
3143 # during the Arnoldo Aleman administration."...
3144 # The northamerica file says that Nicaragua has been on UTC-6 continuously
3145 # since December 1998. I wasn't able to find any details of Nicaraguan time
3146 # changes in 2000. Perhaps a note could be added to the northamerica file, to
3147 # the effect that we have indirect evidence that DST was observed in 2000.
3148 #
3149 # From Jesper Norgaard Welen (2005-11-02):
3150 # Nicaragua left DST the 2005-10-02 at 00:00 (local time).
3151 # http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
3152 # (2005-09-26)
3153 #
3154 # From Jesper Norgaard Welen (2006-05-05):
3155 # http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410
3156 # (my informal translation)
3157 # By order of the president of the republic, Enrique Bolanos, Nicaragua
3158 # advanced by sixty minutes their official time, yesterday at 2 in the
3159 # morning, and will stay that way until 30.th. of september.
3160 #
3161 # From Jesper Norgaard Welen (2006-09-30):
3162 # http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf
3163 # My informal translation runs:
3164 # The natural sun time is restored in all the national territory, in that the
3165 # time is returned one hour at 01:00 am of October 1 of 2006.
3166 #
3167 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3168 Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
3169 Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
3170 Rule Nic 2005 only - Apr 10 0:00 1:00 D
3171 Rule Nic 2005 only - Oct Sun>=1 0:00 0 S
3172 Rule Nic 2006 only - Apr 30 2:00 1:00 D
3173 Rule Nic 2006 only - Oct Sun>=1 1:00 0 S
3174 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3175 Zone America/Managua -5:45:08 - LMT 1890
3176 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
3177 -6:00 - CST 1973 May
3178 -5:00 - EST 1975 Feb 16
3179 -6:00 Nic C%sT 1992 Jan 1 4:00
3180 -5:00 - EST 1992 Sep 24
3181 -6:00 - CST 1993
3182 -5:00 - EST 1997
3183 -6:00 Nic C%sT
3184
3185 # Panama
3186 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3187 Zone America/Panama -5:18:08 - LMT 1890
3188 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
3189 -5:00 - EST
3190
3191 # Puerto Rico
3192 # There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
3193 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3194 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
3195 -4:00 - AST 1942 May 3
3196 -4:00 US A%sT 1946
3197 -4:00 - AST
3198
3199 # St Kitts-Nevis
3200 # St Lucia
3201 # See 'southamerica'.
3202
3203 # St Pierre and Miquelon
3204 # There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
3205 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3206 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3207 -4:00 - AST 1980 May
3208 -3:00 - PMST 1987 # Pierre & Miquelon Time
3209 -3:00 Canada PM%sT
3210
3211 # St Vincent and the Grenadines
3212 # See 'southamerica'.
3213
3214 # Turks and Caicos
3215 #
3216 # From Chris Dunn in
3217 # <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007>
3218 # (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
3219 # daylight saving dates for time changes have been adjusted to match
3220 # the recent U.S. change of dates.
3221 #
3222 # From Brian Inglis (2007-04-28):
3223 # http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
3224 # there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
3225 # rows before that there is an out of date entry for Oct:
3226 # "Eastern Standard Times Begins 2007
3227 # Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
3228 # indicating that the normal ET rules are followed.
3229 #
3230 # From Paul Eggert (2006-05-01):
3231 # Shanks & Pottenger say they use US DST rules, but IATA SSIM (1991/1998)
3232 # says they switch at midnight. Go with Shanks & Pottenger.
3233 #
3234 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3235 Rule TC 1979 1986 - Apr lastSun 2:00 1:00 D
3236 Rule TC 1979 2006 - Oct lastSun 2:00 0 S
3237 Rule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D
3238 Rule TC 2007 max - Mar Sun>=8 2:00 1:00 D
3239 Rule TC 2007 max - Nov Sun>=1 2:00 0 S
3240 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3241 Zone America/Grand_Turk -4:44:32 - LMT 1890
3242 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3243 -5:00 TC E%sT
3244
3245 # British Virgin Is
3246 # Virgin Is
3247 # See 'southamerica'.
|
4 # This code is free software; you can redistribute it and/or modify it
5 # under the terms of the GNU General Public License version 2 only, as
6 # published by the Free Software Foundation. Oracle designates this
7 # particular file as subject to the "Classpath" exception as provided
8 # by Oracle in the LICENSE file that accompanied this code.
9 #
10 # This code is distributed in the hope that it will be useful, but WITHOUT
11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 # version 2 for more details (a copy is included in the LICENSE file that
14 # accompanied this code).
15 #
16 # You should have received a copy of the GNU General Public License version
17 # 2 along with this work; if not, write to the Free Software Foundation,
18 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 #
20 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 # or visit www.oracle.com if you need additional information or have any
22 # questions.
23 #
24 # This file is in the public domain, so clarified as of
25 # 2009-05-17 by Arthur David Olson.
26
27 # also includes Central America and the Caribbean
28
29 # This file is by no means authoritative; if you think you know better,
30 # go ahead and edit the file (and please send any changes to
31 # tz@iana.org for general use in the future). For more, please see
32 # the file CONTRIBUTING in the tz distribution.
33
34 # From Paul Eggert (1999-03-22):
35 # A reliable and entertaining source about time zones is
36 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
37
38 ###############################################################################
39
40 # United States
41
42 # From Paul Eggert (1999-03-31):
43 # Howse writes (pp 121-125) that time zones were invented by
44 # Professor Charles Ferdinand Dowd (1825-1904),
45 # Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
46 # His pamphlet "A System of National Time for Railroads" (1870)
47 # was the result of his proposals at the Convention of Railroad Trunk Lines
48 # in New York City (1869-10). His 1870 proposal was based on Washington, DC,
49 # but in 1872-05 he moved the proposed origin to Greenwich.
50 # His proposal was adopted by the railroads on 1883-11-18 at 12:00,
51 # and the most of the country soon followed suit.
52
65 # Daylight Saving Time was first suggested as a joke by Benjamin Franklin
66 # in his whimsical essay "An Economical Project for Diminishing the Cost
67 # of Light" published in the Journal de Paris (1784-04-26).
68 # Not everyone is happy with the results:
69 #
70 # I don't really care how time is reckoned so long as there is some
71 # agreement about it, but I object to being told that I am saving
72 # daylight when my reason tells me that I am doing nothing of the kind.
73 # I even object to the implication that I am wasting something
74 # valuable if I stay in bed after the sun has risen. As an admirer
75 # of moonlight I resent the bossy insistence of those who want to
76 # reduce my time for enjoying it. At the back of the Daylight Saving
77 # scheme I detect the bony, blue-fingered hand of Puritanism, eager
78 # to push people into bed earlier, and get them up earlier, to make
79 # them healthy, wealthy and wise in spite of themselves.
80 #
81 # -- Robertson Davies, The diary of Samuel Marchbanks,
82 # Clarke, Irwin (1947), XIX, Sunday
83 #
84 # For more about the first ten years of DST in the United States, see
85 # Robert Garland, Ten years of daylight saving from the Pittsburgh standpoint
86 # (Carnegie Library of Pittsburgh, 1927).
87 # http://www.clpgh.org/exhibit/dst.html
88 #
89 # Shanks says that DST was called "War Time" in the US in 1918 and 1919.
90 # However, DST was imposed by the Standard Time Act of 1918, which
91 # was the first nationwide legal time standard, and apparently
92 # time was just called "Standard Time" or "Daylight Saving Time".
93
94 # From Arthur David Olson:
95 # US Daylight Saving Time ended on the last Sunday of *October* in 1974.
96 # See, for example, the front page of the Saturday, 1974-10-26
97 # and Sunday, 1974-10-27 editions of the Washington Post.
98
99 # From Arthur David Olson:
100 # Before the Uniform Time Act of 1966 took effect in 1967, observance of
101 # Daylight Saving Time in the US was by local option, except during wartime.
102
103 # From Arthur David Olson (2000-09-25):
104 # Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama.
105 # In the introduction, Oboler spoke of "Eastern Peace Time."
106 # An AltaVista search turned up:
107 # http://rowayton.org/rhs/hstaug45.html
108 # "When the time is announced over the radio now, it is 'Eastern Peace
109 # Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful."
110 # (August 1945) by way of confirmation.
111
112 # From Joseph Gallant citing
113 # George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
114 # At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
115 # to switch to London for Attlee's address, but the American people
116 # never got to hear his speech live. According to one press account,
117 # CBS' Bob Trout was first to announce the word of Japan's surrender,
118 # but a few seconds later, NBC, ABC and Mutual also flashed the word
119 # of surrender, all of whom interrupting the bells of Big Ben in
120 # London which were to precede Mr. Attlee's speech.
121
122 # From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From
123 # Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times:
124 #
125 # ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender.
126 # Any announcement from Asia would reach St. John's New York newsroom on a
127 # wire service teletype machine, which had prescribed signals for major news.
128 # Associated Press, for example, would ring five bells before spewing out
129 # typed copy of an important story, and 10 bells for news "of transcendental
130 # importance."
188 # ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
189 # The YST zone now covers nearly all of the state, AHST just part
190 # of the Aleutian islands. No DST.
191
192 # From Paul Eggert (1995-12-19):
193 # The tables below use 'NST', not 'NT', for Nome Standard Time.
194 # I invented 'CAWT' for Central Alaska War Time.
195
196 # From U. S. Naval Observatory (1989-01-19):
197 # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
198 # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
199 # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
200 # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
201 # USA MOUNTAIN 7 H BEHIND UTC DENVER
202 # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
203 # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
204 # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
205 # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
206 # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
207 # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
208 # USA " 9 H BEHIND UTC APR 3 - OCT 30
209 # USA HAWAII 10 H BEHIND UTC
210 # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
211
212 # From Arthur David Olson (1989-01-21):
213 # The above dates are for 1988.
214 # Note the "AKST" and "AKDT" abbreviations, the claim that there's
215 # no DST in Samoa, and the claim that there is DST in Alaska and the
216 # Aleutians.
217
218 # From Arthur David Olson (1988-02-13):
219 # Legal standard time zone names, from United States Code (1982 Edition and
220 # Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
221 # up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
222 # took effect), as explained in sections 263 and 261:
223 # (none)
224 # United States standard eastern time
225 # United States standard mountain time
226 # United States standard central time
227 # United States standard Pacific time
228 # (none)
241 # And after 1983-11-30:
242 # Atlantic standard time
243 # eastern standard time
244 # central standard time
245 # mountain standard time
246 # Pacific standard time
247 # Alaska standard time
248 # Hawaii-Aleutian standard time
249 # Samoa standard time
250 # The law doesn't give abbreviations.
251 #
252 # From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
253 # Public law 106-564 (2000-12-23) introduced the abbreviation
254 # "Chamorro Standard Time" for time in Guam and the Northern Marianas.
255 # See the file "australasia".
256
257 # From Arthur David Olson, 2005-08-09
258 # The following was signed into law on 2005-08-08.
259 #
260 # H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
261 # (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15
262 # U.S.C. 260a(a)) is amended--
263 # (1) by striking "first Sunday of April" and inserting "second
264 # Sunday of March"; and
265 # (2) by striking "last Sunday of October" and inserting "first
266 # Sunday of November'.
267 # (b) Effective Date.--Subsection (a) shall take effect 1 year after the
268 # date of enactment of this Act or March 1, 2007, whichever is later.
269 # (c) Report to Congress.--Not later than 9 months after the effective
270 # date stated in subsection (b), the Secretary shall report to Congress
271 # on the impact of this section on energy consumption in the United
272 # States.
273 # (d) Right to Revert.--Congress retains the right to revert the
274 # Daylight Saving Time back to the 2005 time schedules once the
275 # Department study is complete.
276
277 # US eastern time, represented by New York
278
279 # Connecticut, Delaware, District of Columbia, most of Florida,
280 # Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky
281 # (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts,
282 # New Hampshire, New Jersey, New York, North Carolina, Ohio,
283 # Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
284 # Vermont, Virginia, West Virginia
285
286 # From Dave Cantor (2004-11-02):
287 # Early this summer I had the occasion to visit the Mount Washington
288 # Observatory weather station atop (of course!) Mount Washington [, NH]....
289 # One of the staff members said that the station was on Eastern Standard Time
290 # and didn't change their clocks for Daylight Saving ... so that their
291 # reports will always have times which are 5 hours behind UTC.
292
293 # From Paul Eggert (2005-08-26):
294 # According to today's Huntsville Times
295 # http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1
296 # a few towns on Alabama's "eastern border with Georgia, such as Phenix City
297 # in Russell County, Lanett in Chambers County and some towns in Lee County,
298 # set their watches and clocks on Eastern time." It quotes H.H. "Bubba"
299 # Roberts, city administrator in Phenix City. as saying "We are in the Central
300 # time zone, but we do go by the Eastern time zone because so many people work
301 # in Columbus."
302
303 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
304 Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
305 Rule NYC 1920 only - Oct lastSun 2:00 0 S
306 Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
307 Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
308 Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
309 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
310 Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58
311 -5:00 US E%sT 1920
312 -5:00 NYC E%sT 1942
313 -5:00 US E%sT 1946
314 -5:00 NYC E%sT 1967
315 -5:00 US E%sT
338 # http://www.legis.state.wi.us/2007/data/acts/07Act3.pdf
339
340 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
341 Rule Chicago 1920 only - Jun 13 2:00 1:00 D
342 Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
343 Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
344 Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
345 Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
346 Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
347 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
348 Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24
349 -6:00 US C%sT 1920
350 -6:00 Chicago C%sT 1936 Mar 1 2:00
351 -5:00 - EST 1936 Nov 15 2:00
352 -6:00 Chicago C%sT 1942
353 -6:00 US C%sT 1946
354 -6:00 Chicago C%sT 1967
355 -6:00 US C%sT
356 # Oliver County, ND switched from mountain to central time on 1992-10-25.
357 Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48
358 -7:00 US M%sT 1992 Oct 25 2:00
359 -6:00 US C%sT
360 # Morton County, ND, switched from mountain to central time on
361 # 2003-10-26, except for the area around Mandan which was already central time.
362 # See <http://dmses.dot.gov/docimages/p63/135818.pdf>.
363 # Officially this switch also included part of Sioux County, and
364 # Jones, Mellette, and Todd Counties in South Dakota;
365 # but in practice these other counties were already observing central time.
366 # See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>.
367 Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21
368 -7:00 US M%sT 2003 Oct 26 2:00
369 -6:00 US C%sT
370
371 # From Josh Findley (2011-01-21):
372 # ...it appears that Mercer County, North Dakota, changed from the
373 # mountain time zone to the central time zone at the last transition from
374 # daylight-saving to standard time (on Nov. 7, 2010):
375 # http://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm
376 # http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html
377
378 # From Andy Lipscomb (2011-01-24):
379 # ...according to the Census Bureau, the largest city is Beulah (although
380 # it's commonly referred to as Beulah-Hazen, with Hazen being the next
381 # largest city in Mercer County). Google Maps places Beulah's city hall
382 # at 47 degrees 15' 51" N, 101 degrees 46' 40" W, which yields an offset
383 # of 6h47'07".
384
385 Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
386 -7:00 US M%sT 2010 Nov 7 2:00
387 -6:00 US C%sT
388
389 # US mountain time, represented by Denver
390 #
391 # Colorado, far western Kansas, Montana, western
392 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
393 # New Mexico, southwestern North Dakota,
394 # western South Dakota, far western Texas (El Paso County, Hudspeth County,
395 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
396 #
397 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
398 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
399 Rule Denver 1920 only - Oct lastSun 2:00 0 S
400 Rule Denver 1921 only - May 22 2:00 0 S
401 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
402 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
403 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
428 -8:00 CA P%sT 1967
429 -8:00 US P%sT
430
431 # Alaska
432 # AK%sT is the modern abbreviation for -9:00 per USNO.
433 #
434 # From Paul Eggert (2001-05-30):
435 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
436 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
437 # This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
438 # also a Friday. Include only the time zone part of this transition,
439 # ignoring the switch from Julian to Gregorian, since we can't represent
440 # the Julian calendar.
441 #
442 # As far as we know, none of the exact locations mentioned below were
443 # permanently inhabited in 1867 by anyone using either calendar.
444 # (Yakutat was colonized by the Russians in 1799, but the settlement
445 # was destroyed in 1805 by a Yakutat-kon war party.) However, there
446 # were nearby inhabitants in some cases and for our purposes perhaps
447 # it's best to simply use the official transition.
448
449 # From Paul Eggert (2014-07-18):
450 # One opinion of the early-1980s turmoil in Alaska over time zones and
451 # daylight saving time appeared as graffiti on a Juneau airport wall:
452 # "Welcome to Juneau. Please turn your watch back to the 19th century."
453 # See: Turner W. Alaska's four time zones now two. NY Times 1983-11-01.
454 # http://www.nytimes.com/1983/11/01/us/alaska-s-four-time-zones-now-two.html
455 #
456 # Steve Ferguson (2011-01-31) referred to the following source:
457 # Norris F. Keeping time in Alaska: national directives, local response.
458 # Alaska History 2001;16(1-2).
459 # http://alaskahistoricalsociety.org/discover-alaska/glimpses-of-the-past/keeping-time-in-alaska/
460
461 # From Arthur David Olson (2011-02-01):
462 # Here's database-relevant material from the 2001 "Alaska History" article:
463 #
464 # On September 20 [1979]...DOT...officials decreed that on April 27,
465 # 1980, Juneau and other nearby communities would move to Yukon Time.
466 # Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on
467 # Pacific Time.
468 #
469 # ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the
470 # Department's September 1979 decision. Juneau and other communities in
471 # northern Southeast reverted to Pacific Time on October 26.
472 #
473 # On October 28 [1983]...the Metlakatla Indian Community Council voted
474 # unanimously to keep the reservation on Pacific Time.
475 #
476 # According to DOT official Joanne Petrie, Indian reservations are not
477 # bound to follow time zones imposed by neighboring jurisdictions.
478 #
479 # (The last is consistent with how the database now handles the Navajo
480 # Nation.)
481
482 # From Arthur David Olson (2011-02-09):
483 # I just spoke by phone with a staff member at the Metlakatla Indian
484 # Community office (using contact information available at
485 # http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla
486 # It's shortly after 1:00 here on the east coast of the United States;
487 # the staffer said it was shortly after 10:00 there. When I asked whether
488 # that meant they were on Pacific time, they said no - they were on their
489 # own time. I asked about daylight saving; they said it wasn't used. I
490 # did not inquire about practices in the past.
491
492 # From Arthur David Olson (2011-08-17):
493 # For lack of better information, assume that Metlakatla's
494 # abandonment of use of daylight saving resulted from the 1983 vote.
495
496 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
497 Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
498 -8:57:41 - LMT 1900 Aug 20 12:00
499 -8:00 - PST 1942
500 -8:00 US P%sT 1946
501 -8:00 - PST 1969
502 -8:00 US P%sT 1980 Apr 27 2:00
503 -9:00 US Y%sT 1980 Oct 26 2:00
504 -8:00 US P%sT 1983 Oct 30 2:00
505 -9:00 US Y%sT 1983 Nov 30
506 -9:00 US AK%sT
507 Zone America/Sitka 14:58:47 - LMT 1867 Oct 18
508 -9:01:13 - LMT 1900 Aug 20 12:00
509 -8:00 - PST 1942
510 -8:00 US P%sT 1946
511 -8:00 - PST 1969
512 -8:00 US P%sT 1983 Oct 30 2:00
513 -9:00 US Y%sT 1983 Nov 30
514 -9:00 US AK%sT
515 Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18
516 -8:46:18 - LMT 1900 Aug 20 12:00
517 -8:00 - PST 1942
518 -8:00 US P%sT 1946
519 -8:00 - PST 1969
520 -8:00 US P%sT 1983 Oct 30 2:00
521 -8:00 - PST
522 Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
523 -9:18:55 - LMT 1900 Aug 20 12:00
524 -9:00 - YST 1942
525 -9:00 US Y%sT 1946
526 -9:00 - YST 1969
527 -9:00 US Y%sT 1983 Nov 30
528 -9:00 US AK%sT
529 Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
530 -9:59:36 - LMT 1900 Aug 20 12:00
531 -10:00 - CAT 1942
532 -10:00 US CAT/CAWT 1945 Aug 14 23:00u
533 -10:00 US CAT/CAPT 1946 # Peace
534 -10:00 - CAT 1967 Apr
535 -10:00 - AHST 1969
536 -10:00 US AH%sT 1983 Oct 30 2:00
537 -9:00 US Y%sT 1983 Nov 30
538 -9:00 US AK%sT
539 Zone America/Nome 12:58:21 - LMT 1867 Oct 18
540 -11:01:38 - LMT 1900 Aug 20 12:00
541 -11:00 - NST 1942
564 # In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
565 # Historic Preservation Commission, provided this information, which
566 # suggests that Unalaska deviated from statutory time from early 1967
567 # possibly until 1983:
568 #
569 # Minutes of the Unalaska City Council Meeting, January 10, 1967:
570 # "Except for St. Paul and Akutan, Unalaska is the only important
571 # location not on Alaska Standard Time. The following resolution was
572 # made by William Robinson and seconded by Henry Swanson: Be it
573 # resolved that the City of Unalaska hereby goes to Alaska Standard
574 # Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
575 # January 14, Alaska Standard Time.) This resolution was passed with
576 # three votes for and one against."
577
578 # Hawaii
579
580 # From Arthur David Olson (2010-12-09):
581 # "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225
582 # of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09,
583 # the article is available at
584 # http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf
585 # and indicates that standard time was adopted effective noon, January
586 # 13, 1896 (page 218), that in "1933, the Legislature decreed daylight
587 # saving for the period between the last Sunday of each April and the
588 # last Sunday of each September, but less than a month later repealed the
589 # act," (page 220), that year-round daylight saving time was in effect
590 # from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for
591 # when clocks changed) and that clocks were changed by 30 minutes
592 # effective the second Sunday of June, 1947 (page 219, with no time of
593 # day given for when clocks changed). A footnote for the 1933 changes
594 # cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933)
595 # and Act 163 (approved 21 May 1933)."
596
597 # From Arthur David Olson (2011-01-19):
598 # The following is from "Laws of the Territory of Hawaii Passed by the
599 # Seventeenth Legislature: Regular Session 1933," available (as of
600 # 2011-01-19) at American University's Pence Law Library. Page 85: "Act
601 # 90...At 2 o'clock ante meridian of the last Sunday in April of each
602 # year, the standard time of this Territory shall be advanced one
603 # hour...This Act shall take effect upon its approval. Approved this 26th
604 # day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
605 # Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is
606 # hereby repealed...This Act shall take effect upon its approval, upon
607 # which date the standard time of this Territory shall be restored to
608 # that existing immediately prior to the taking effect of said Act 90.
609 # Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
610 # of the Territory of Hawaii."
611 #
612 # Note that 1933-05-21 was a Sunday.
613 # We're left to guess the time of day when Act 163 was approved; guess noon.
614
615 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
616 Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00
617 -10:30 - HST 1933 Apr 30 2:00
618 -10:30 1:00 HDT 1933 May 21 12:00
619 -10:30 - HST 1942 Feb 9 2:00
620 -10:30 1:00 HDT 1945 Sep 30 2:00
621 -10:30 - HST 1947 Jun 8 2:00
622 -10:00 - HST
623 Link Pacific/Honolulu Pacific/Johnston
624
625 # Now we turn to US areas that have diverged from the consensus since 1970.
626
627 # Arizona mostly uses MST.
628
629 # From Paul Eggert (2002-10-20):
630 #
631 # The information in the rest of this paragraph is derived from the
632 # Daylight Saving Time web page
633 # <http://www.dlapr.lib.az.us/links/daylight.htm> (2002-01-23)
634 # maintained by the Arizona State Library, Archives and Public Records.
635 # Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
636 # time, but by federal law railroads, airlines, bus lines, military
637 # personnel, and some engaged in interstate commerce continued to
638 # observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
639 # Gazette says that was the date the law changed, and that 04-01 was
640 # the date the state's clocks would change. In 1945 the State of
641 # Arizona used standard time all year, again with exceptions only as
642 # mandated by federal law. Arizona observed DST in 1967, but Arizona
643 # Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
644 #
645 # Shanks says the 1944 experiment came to an end on 1944-03-17.
646 # Go with the Arizona State Library instead.
647
648 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
649 Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42
650 -7:00 US M%sT 1944 Jan 1 0:01
651 -7:00 - MST 1944 Apr 1 0:01
652 -7:00 US M%sT 1944 Oct 1 0:01
653 -7:00 - MST 1967
654 -7:00 US M%sT 1968 Mar 21
655 -7:00 - MST
656 # From Arthur David Olson (1988-02-13):
657 # A writer from the Inter Tribal Council of Arizona, Inc.,
658 # notes in private correspondence dated 1987-12-28 that "Presently, only the
659 # Navajo Nation participates in the Daylight Saving Time policy, due to its
660 # large size and location in three states." (The "only" means that other
661 # tribal nations don't use DST.)
662 #
663 # From Paul Eggert (2013-08-26):
664 # See America/Denver for a zone appropriate for the Navajo Nation.
665
666 # Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
667 # Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
668 # Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
669 # Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
670 # Teton, Twin Falls, Valley, Washington counties, and the southern
671 # quarter of Idaho county) and eastern Oregon (most of Malheur County)
672 # switched four weeks late in 1974.
673 #
674 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
675 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
676 -8:00 US P%sT 1923 May 13 2:00
677 -7:00 US M%sT 1974
678 -7:00 - MST 1974 Feb 3 2:00
679 -7:00 US M%sT
680
681 # Indiana
682 #
683 # For a map of Indiana's time zone regions, see:
684 # http://en.wikipedia.org/wiki/Time_in_Indiana
685 #
686 # From Paul Eggert (2007-08-17):
687 # Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
688 # with the following exceptions:
689 #
690 # - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
691 # Vanderburgh, and Warrick counties have been like America/Chicago.
692 #
693 # - Dearborn and Ohio counties have been like America/New_York.
694 #
695 # - Clark, Floyd, and Harrison counties have been like
696 # America/Kentucky/Louisville.
697 #
698 # - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
699 # and Switzerland counties have their own time zone histories as noted below.
700 #
701 # Shanks partitioned Indiana into 345 regions, each with its own time history,
702 # and wrote "Even newspaper reports present contradictory information."
703 # Those Hoosiers! Such a flighty and changeable people!
704 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
705 #
706 # Other than Indianapolis, the Indiana place names are so nondescript
707 # that they would be ambiguous if we left them at the 'America' level.
708 # So we reluctantly put them all in a subdirectory 'America/Indiana'.
709
710 # From Paul Eggert (2014-06-26):
711 # https://www.federalregister.gov/articles/2006/01/20/06-563/standard-time-zone-boundary-in-the-state-of-indiana
712 # says "DOT is relocating the time zone boundary in Indiana to move Starke,
713 # Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
714 # Eastern Time Zone to the Central Time Zone.... The effective date of
715 # this rule is 2 a.m. EST Sunday, April 2, 2006, which is the
716 # changeover date from standard time to Daylight Saving Time."
717 # Strictly speaking, this meant the affected counties changed their
718 # clocks twice that night, but this obviously was in error. The intent
719 # was that 01:59:59 EST be followed by 02:00:00 CDT.
720
721 # From Gwillim Law (2007-02-10):
722 # The Associated Press has been reporting that Pulaski County, Indiana is
723 # going to switch from Central to Eastern Time on March 11, 2007....
724 # http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL
725
726 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
727 Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
728 Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
729 Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
730 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
731 Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22
732 -6:00 US C%sT 1920
733 -6:00 Indianapolis C%sT 1942
734 -6:00 US C%sT 1946
735 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
736 -5:00 - EST 1957 Sep 29 2:00
737 -6:00 - CST 1958 Apr 27 2:00
738 -5:00 - EST 1969
739 -5:00 US E%sT 1971
871 Rule Louisville 1921 only - May 1 2:00 1:00 D
872 Rule Louisville 1921 only - Sep 1 2:00 0 S
873 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
874 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
875 Rule Louisville 1946 only - Jun 2 2:00 0 S
876 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
877 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
878 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
879 Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
880 -6:00 US C%sT 1921
881 -6:00 Louisville C%sT 1942
882 -6:00 US C%sT 1946
883 -6:00 Louisville C%sT 1961 Jul 23 2:00
884 -5:00 - EST 1968
885 -5:00 US E%sT 1974 Jan 6 2:00
886 -6:00 1:00 CDT 1974 Oct 27 2:00
887 -5:00 US E%sT
888 #
889 # Wayne County, Kentucky
890 #
891 # From Lake Cumberland LIFE
892 # http://www.lake-cumberland.com/life/archive/news990129time.shtml
893 # (1999-01-29) via WKYM-101.7:
894 # Clinton County has joined Wayne County in asking the DoT to change from
895 # the Central to the Eastern time zone.... The Wayne County government made
896 # the same request in December. And while Russell County officials have not
897 # taken action, the majority of respondents to a poll conducted there in
898 # August indicated they would like to change to "fast time" also.
899 # The three Lake Cumberland counties are the farthest east of any U.S.
900 # location in the Central time zone.
901 #
902 # From Rich Wales (2000-08-29):
903 # After prolonged debate, and despite continuing deep differences of opinion,
904 # Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
905 # (-0500) time. They won't "fall back" this year. See Sara Shipley,
906 # The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
907 #
908 # From Paul Eggert (2001-07-16):
909 # The final rule was published in the
910 # Federal Register 65, 160 (2000-08-17), pp 50154-50158.
911 # http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22
912 #
913 Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
914 -6:00 US C%sT 1946
915 -6:00 - CST 1968
916 -6:00 US C%sT 2000 Oct 29 2:00
917 -5:00 US E%sT
918
919
920 # From Rives McDow (2000-08-30):
921 # Here ... are all the changes in the US since 1985.
922 # Kearny County, KS (put all of county on central;
923 # previously split between MST and CST) ... 1990-10
924 # Starke County, IN (from CST to EST) ... 1991-10
925 # Oliver County, ND (from MST to CST) ... 1992-10
926 # West Wendover, NV (from PST TO MST) ... 1999-10
927 # Wayne County, KY (from CST to EST) ... 2000-10
928 #
929 # From Paul Eggert (2001-07-17):
930 # We don't know where the line used to be within Kearny County, KS,
931 # so omit that change for now.
932 # See America/Indiana/Knox for the Starke County, IN change.
933 # See America/North_Dakota/Center for the Oliver County, ND change.
934 # West Wendover, NV officially switched from Pacific to mountain time on
935 # 1999-10-31. See the
936 # Federal Register 64, 203 (1999-10-21), pp 56705-56707.
937 # http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15
938 # However, the Federal Register says that West Wendover already operated
939 # on mountain time, and the rule merely made this official;
940 # hence a separate tz entry is not needed.
941
942 # Michigan
943 #
944 # From Bob Devine (1988-01-28):
945 # Michigan didn't observe DST from 1968 to 1973.
946 #
947 # From Paul Eggert (1999-03-31):
948 # Shanks writes that Michigan started using standard time on 1885-09-18,
949 # but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
950 # that Detroit kept
951 #
952 # local time until 1900 when the City Council decreed that clocks should
953 # be put back twenty-eight minutes to Central Standard Time. Half the
954 # city obeyed, half refused. After considerable debate, the decision
955 # was rescinded and the city reverted to Sun time. A derisive offer to
956 # erect a sundial in front of the city hall was referred to the
957 # Committee on Sewers. Then, in 1905, Central time was adopted
1011 # From Paul Eggert (2006-03-22):
1012 # A good source for time zone historical data outside the U.S. is
1013 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
1014 # San Diego: ACS Publications, Inc. (2003).
1015 #
1016 # Gwillim Law writes that a good source
1017 # for recent time zone data is the International Air Transport
1018 # Association's Standard Schedules Information Manual (IATA SSIM),
1019 # published semiannually. Law sent in several helpful summaries
1020 # of the IATA's data after 1990.
1021 #
1022 # Except where otherwise noted, Shanks & Pottenger is the source for
1023 # entries through 1990, and IATA SSIM is the source for entries afterwards.
1024 #
1025 # Other sources occasionally used include:
1026 #
1027 # Edward W. Whitman, World Time Differences,
1028 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
1029 # which I found in the UCLA library.
1030 #
1031 # William Willett, The Waste of Daylight, 19th edition
1032 # <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf>
1033 # [PDF] (1914-03)
1034 #
1035 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
1036 # <http://www.jstor.org/stable/1774359>.
1037 #
1038 # See the 'europe' file for Greenland.
1039
1040 # Canada
1041
1042 # From Alain LaBonté (1994-11-14):
1043 # I post here the time zone abbreviations standardized in Canada
1044 # for both English and French in the CAN/CSA-Z234.4-89 standard....
1045 #
1046 # UTC Standard time Daylight saving time
1047 # offset French English French English
1048 # -2:30 - - HAT NDT
1049 # -3 - - HAA ADT
1050 # -3:30 HNT NST - -
1051 # -4 HNA AST HAE EDT
1052 # -5 HNE EST HAC CDT
1053 # -6 HNC CST HAR MDT
1054 # -7 HNR MST HAP PDT
1055 # -8 HNP PST HAY YDT
1056 # -9 HNY YST - -
1057 #
1058 # HN: Heure Normale ST: Standard Time
1059 # HA: Heure Avancée DT: Daylight saving Time
1060 #
1061 # A: de l'Atlantique Atlantic
1062 # C: du Centre Central
1063 # E: de l'Est Eastern
1064 # M: Mountain
1065 # N: Newfoundland
1066 # P: du Pacifique Pacific
1067 # R: des Rocheuses
1068 # T: de Terre-Neuve
1069 # Y: du Yukon Yukon
1070 #
1071 # From Paul Eggert (1994-11-22):
1072 # Alas, this sort of thing must be handled by localization software.
1073
1074 # Unless otherwise specified, the data entries for Canada are all from Shanks
1075 # & Pottenger.
1076
1077 # From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
1078 # 2007-03-01):
1079 # The British Columbia government announced yesterday that it will
1080 # adjust daylight savings next year to align with changes in the
1081 # U.S. and the rest of Canada....
1082 # http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
1083 # ...
1084 # Nova Scotia
1085 # Daylight saving time will be extended by four weeks starting in 2007....
1086 # http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf
1087 #
1088 # [For New Brunswick] the new legislation dictates that the time change is to
1089 # be done at 02:00 instead of 00:01.
1090 # http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
1091 # ...
1092 # Manitoba has traditionally changed the clock every fall at 03:00.
1093 # As of 2006, the transition is to take place one hour earlier at 02:00.
1094 # http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
1103 # ...
1104 # Province of Newfoundland and Labrador....
1105 # http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
1106 # ...
1107 # Yukon
1108 # http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
1109 # ...
1110 # N.W.T. will follow US rules. Whoever maintains the government web site
1111 # does not seem to believe in bookmarks. To see the news release, click the
1112 # following link and search for "Daylight Savings Time Change". Press the
1113 # "Daylight Savings Time Change" link; it will fire off a popup using
1114 # JavaScript.
1115 # http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
1116 # ...
1117 # Nunavut
1118 # An amendment to the Interpretation Act was registered on February 19/2007....
1119 # http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
1120
1121 # From Paul Eggert (2006-04-25):
1122 # H. David Matthews and Mary Vincent's map
1123 # "It's about TIME", _Canadian Geographic_ (September-October 1998)
1124 # http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp
1125 # contains detailed boundaries for regions observing nonstandard
1126 # time and daylight saving time arrangements in Canada circa 1998.
1127 #
1128 # INMS, the Institute for National Measurement Standards in Ottawa, has
1129 # information about standard and daylight saving time zones in Canada.
1130 # http://inms-ienm.nrc-cnrc.gc.ca/en/time_services/daylight_saving_e.php
1131 # (updated periodically).
1132 # Its unofficial information is often taken from Matthews and Vincent.
1133
1134 # From Paul Eggert (2006-06-27):
1135 # For now, assume all of DST-observing Canada will fall into line with the
1136 # new US DST rules,
1137
1138 # From Chris Walton (2011-12-01)
1139 # In the first of Tammy Hardwick's articles
1140 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1141 # she quotes the Friday November 1/1918 edition of the Creston Review.
1142 # The quote includes these two statements:
1143 # 'Sunday the CPR went back to the old system of time...'
1144 # '... The daylight saving scheme was dropped all over Canada at the same time,'
1145 # These statements refer to a transition from daylight time to standard time
1146 # that occurred nationally on Sunday October 27/1918. This transition was
1147 # also documented in the Saturday October 26/1918 edition of the Toronto Star.
1148
1149 # In light of that evidence, we alter the date from the earlier believed
1150 # Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day
1151 # than Thursday) in all Canadian rulesets.
1152
1153 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1154 Rule Canada 1918 only - Apr 14 2:00 1:00 D
1155 Rule Canada 1918 only - Oct 27 2:00 0 S
1156 Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
1157 Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
1158 Rule Canada 1945 only - Sep 30 2:00 0 S
1159 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
1160 Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
1188 # 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
1189 # but go with Shanks & Pottenger and assume they used Canadian rules.
1190 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
1191 # Apr 30 - Sep 24; go with Shanks & Pottenger.
1192 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
1193 Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
1194 Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
1195 Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
1196 Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
1197 # From Paul Eggert (2000-10-02):
1198 # INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
1199 # at 00:01 local time. For now, assume it started in 1987.
1200
1201 # From Michael Pelley (2011-09-12):
1202 # We received today, Monday, September 12, 2011, notification that the
1203 # changes to the Newfoundland Standard Time Act have been proclaimed.
1204 # The change in the Act stipulates that the change from Daylight Savings
1205 # Time to Standard Time and from Standard Time to Daylight Savings Time
1206 # now occurs at 2:00AM.
1207 # ...
1208 # http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm
1209 # ...
1210 # MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery
1211 # Office of the Chief Information Officer
1212 # Executive Council
1213 # Government of Newfoundland & Labrador
1214
1215 Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
1216 Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S
1217 Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
1218 Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D
1219 Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D
1220 Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S
1221 #
1222 # St John's has an apostrophe, but Posix file names can't have apostrophes.
1223 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1224 Zone America/St_Johns -3:30:52 - LMT 1884
1225 -3:30:52 StJohns N%sT 1918
1226 -3:30:52 Canada N%sT 1919
1227 -3:30:52 StJohns N%sT 1935 Mar 30
1228 -3:30 StJohns N%sT 1942 May 11
1344 -4:00 Canada A%sT 1946
1345 -4:00 Moncton A%sT 1973
1346 -4:00 Canada A%sT 1993
1347 -4:00 Moncton A%sT 2007
1348 -4:00 Canada A%sT
1349
1350 # Quebec
1351
1352 # From Paul Eggert (2013-08-30):
1353 # Since 1970 most of Quebec has been like Toronto.
1354 # However, because earlier versions of the tz database mistakenly relied on data
1355 # from Shanks & Pottenger saying that Quebec differed from Ontario after 1970,
1356 # a separate entry was created for most of Quebec. We're loath to lose
1357 # its pre-1970 info, even though the tz database is normally limited to
1358 # zones that differ after 1970, so keep this otherwise out-of-scope entry.
1359
1360 # Matthews and Vincent (1998) also write that Quebec east of the -63
1361 # meridian is supposed to observe AST, but residents as far east as
1362 # Natashquan use EST/EDT, and residents east of Natashquan use AST.
1363 # The Quebec department of justice writes in
1364 # "The situation in Minganie and Basse-Côte-Nord"
1365 # http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm
1366 # that the coastal strip from just east of Natashquan to Blanc-Sablon
1367 # observes Atlantic standard time all year round.
1368 # http://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en
1369 # says this common practice was codified into law as of 2007.
1370 # For lack of better info, guess this practice began around 1970, contra to
1371 # Shanks & Pottenger who have this region observing AST/ADT.
1372
1373 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1374 Rule Mont 1917 only - Mar 25 2:00 1:00 D
1375 Rule Mont 1917 only - Apr 24 0:00 0 S
1376 Rule Mont 1919 only - Mar 31 2:30 1:00 D
1377 Rule Mont 1919 only - Oct 25 2:30 0 S
1378 Rule Mont 1920 only - May 2 2:30 1:00 D
1379 Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
1380 Rule Mont 1921 only - May 1 2:00 1:00 D
1381 Rule Mont 1922 only - Apr 30 2:00 1:00 D
1382 Rule Mont 1924 only - May 17 2:00 1:00 D
1383 Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
1384 Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
1385 Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D
1386 Rule Mont 1927 1937 - Sep lastSat 24:00 0 S
1387 Rule Mont 1938 1940 - Apr lastSun 0:00 1:00 D
1388 Rule Mont 1938 1939 - Sep lastSun 0:00 0 S
1389 Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D
1390 Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
1391 Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
1392 Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
1393 Rule Mont 1957 1973 - Oct lastSun 2:00 0 S
1394
1395 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1396 Zone America/Blanc-Sablon -3:48:28 - LMT 1884
1397 -4:00 Canada A%sT 1970
1398 -4:00 - AST
1399 Zone America/Montreal -4:54:16 - LMT 1884
1400 -5:00 Mont E%sT 1918
1401 -5:00 Canada E%sT 1919
1402 -5:00 Mont E%sT 1942 Feb 9 2:00s
1403 -5:00 Canada E%sT 1946
1404 -5:00 Mont E%sT 1974
1405 -5:00 Canada E%sT
1406
1407 # Ontario
1408
1409 # From Paul Eggert (2006-07-09):
1410 # Shanks & Pottenger write that since 1970 most of Ontario has been like
1411 # Toronto.
1412 # Thunder Bay skipped DST in 1973.
1413 # Many smaller locales did not observe peacetime DST until 1974;
1414 # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1415 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
1416
1417 # From Mark Brader (2003-07-26):
1418 # [According to the Toronto Star] Orillia, Ontario, adopted DST
1419 # effective Saturday, 1912-06-22, 22:00; the article mentions that
1420 # Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
1421 # have already done so. In Orillia DST was to run until Saturday,
1422 # 1912-08-31 (no time mentioned), but it was met with considerable
1423 # hostility from certain segments of the public, and was revoked after
1424 # only two weeks - I copied it as Saturday, 1912-07-07, 22:00, but
1425 # presumably that should be -07-06. (1912-06-19, -07-12; also letters
1426 # earlier in June).
1427 #
1428 # Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
1429
1430 # From Paul Eggert (1997-10-17):
1431 # Mark Brader writes that an article in the 1997-10-14 Toronto Star
1432 # says that Atikokan, Ontario currently does not observe DST,
1433 # but will vote on 11-10 whether to use EST/EDT.
1434 # He also writes that the Ontario Time Act (1990, Chapter T.9)
1435 # http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html
1436 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
1437 # Officially Atikokan is therefore on CST/CDT, and most likely this report
1438 # concerns a non-official time observed as a matter of local practice.
1439 #
1440 # From Paul Eggert (2000-10-02):
1441 # Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
1442 # New Osnaburgh observe CST all year, that Big Trout Lake observes
1443 # CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
1444 # violation of the official Ontario rules.
1445 #
1446 # From Paul Eggert (2006-07-09):
1447 # Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
1448 # 2005-07-21 Chronicle-Journal, which said:
1449 #
1450 # The clocks in Atikokan stay set on standard time year-round.
1451 # This means they spend about half the time on central time and
1452 # the other half on eastern time.
1453 #
1454 # For the most part, the system works, Mayor Dennis Brown said.
1455 #
1494 #
1495 # The one-hour setback will go into effect throughout most of Ontario,
1496 # except in areas like Windsor which remains on standard time all year.
1497 #
1498 # Windsor is, of course, a lot larger than Nipigon.
1499 #
1500 # I only came across this incidentally. I don't know if Windsor began
1501 # observing DST when Detroit did, or in 1974, or on some other date.
1502 #
1503 # By the way, the article continues by noting that:
1504 #
1505 # Some cities in the United States have pushed the deadline back
1506 # three weeks and will change over from daylight saving in October.
1507
1508 # From Arthur David Olson (2010-07-17):
1509 #
1510 # "Standard Time and Time Zones in Canada" appeared in
1511 # The Journal of The Royal Astronomical Society of Canada,
1512 # volume 26, number 2 (February 1932) and, as of 2010-07-17,
1513 # was available at
1514 # http://adsabs.harvard.edu/full/1932JRASC..26...49S
1515 #
1516 # It includes the text below (starting on page 57):
1517 #
1518 # A list of the places in Canada using daylight saving time would
1519 # require yearly revision. From information kindly furnished by
1520 # the provincial governments and by the postmasters in many cities
1521 # and towns, it is found that the following places used daylight sav-
1522 # ing in 1930. The information for the province of Quebec is definite,
1523 # for the other provinces only approximate:
1524 #
1525 # Province Daylight saving time used
1526 # Prince Edward Island Not used.
1527 # Nova Scotia In Halifax only.
1528 # New Brunswick In St. John only.
1529 # Quebec In the following places:
1530 # Montreal Lachine
1531 # Quebec Mont-Royal
1532 # Lévis Iberville
1533 # St. Lambert Cap de la Madelèine
1534 # Verdun Loretteville
1535 # Westmount Richmond
1536 # Outremont St. Jérôme
1537 # Longueuil Greenfield Park
1538 # Arvida Waterloo
1539 # Chambly-Canton Beaulieu
1540 # Melbourne La Tuque
1541 # St. Théophile Buckingham
1542 # Ontario Used generally in the cities and towns along
1543 # the southerly part of the province. Not
1544 # used in the northwesterly part.
1545 # Manitoba Not used.
1546 # Saskatchewan In Regina only.
1547 # Alberta Not used.
1548 # British Columbia Not used.
1549 #
1550 # With some exceptions, the use of daylight saving may be said to be limited
1551 # to those cities and towns lying between Quebec city and Windsor, Ont.
1552
1553 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1554 Rule Toronto 1919 only - Mar 30 23:30 1:00 D
1555 Rule Toronto 1919 only - Oct 26 0:00 0 S
1556 Rule Toronto 1920 only - May 2 2:00 1:00 D
1557 Rule Toronto 1920 only - Sep 26 0:00 0 S
1558 Rule Toronto 1921 only - May 15 2:00 1:00 D
1559 Rule Toronto 1921 only - Sep 15 2:00 0 S
1560 Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
1561 # Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
1562 # was meant.
1563 Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
1564 Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
1628 Zone America/Rainy_River -6:18:16 - LMT 1895
1629 -6:00 Canada C%sT 1940 Sep 29
1630 -6:00 1:00 CDT 1942 Feb 9 2:00s
1631 -6:00 Canada C%sT
1632 Zone America/Atikokan -6:06:28 - LMT 1895
1633 -6:00 Canada C%sT 1940 Sep 29
1634 -6:00 1:00 CDT 1942 Feb 9 2:00s
1635 -6:00 Canada C%sT 1945 Sep 30 2:00
1636 -5:00 - EST
1637
1638
1639 # Manitoba
1640
1641 # From Rob Douglas (2006-04-06):
1642 # the old Manitoba Time Act - as amended by Bill 2, assented to
1643 # March 27, 1987 ... said ...
1644 # "between two o'clock Central Standard Time in the morning of
1645 # the first Sunday of April of each year and two o'clock Central
1646 # Standard Time in the morning of the last Sunday of October next
1647 # following, one hour in advance of Central Standard Time."...
1648 # I believe that the English legislation [of the old time act] had
1649 # been assented to (March 22, 1967)....
1650 # Also, as far as I can tell, there was no order-in-council varying
1651 # the time of Daylight Saving Time for 2005 and so the provisions of
1652 # the 1987 version would apply - the changeover was at 2:00 Central
1653 # Standard Time (i.e. not until 3:00 Central Daylight Time).
1654
1655 # From Paul Eggert (2006-04-10):
1656 # Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
1657 # starting 1966. Since 02:00s is clearly correct for 1967 on, assume
1658 # it was also 02:00s in 1966.
1659
1660 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1661 Rule Winn 1916 only - Apr 23 0:00 1:00 D
1662 Rule Winn 1916 only - Sep 17 0:00 0 S
1663 Rule Winn 1918 only - Apr 14 2:00 1:00 D
1664 Rule Winn 1918 only - Oct 27 2:00 0 S
1665 Rule Winn 1937 only - May 16 2:00 1:00 D
1666 Rule Winn 1937 only - Sep 26 2:00 0 S
1667 Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
1668 Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
1806 # British Columbia
1807
1808 # From Paul Eggert (2006-03-22):
1809 # Shanks & Pottenger write that since 1970 most of this region has
1810 # been like Vancouver.
1811 # Dawson Creek uses MST. Much of east BC is like Edmonton.
1812 # Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1813
1814 # It seems though that (re: Creston) is not entirely correct:
1815
1816 # From Chris Walton (2011-12-01):
1817 # There are two areas within the Canadian province of British Columbia
1818 # that do not currently observe daylight saving:
1819 # a) The Creston Valley (includes the town of Creston and surrounding area)
1820 # b) The eastern half of the Peace River Regional District
1821 # (includes the cities of Dawson Creek and Fort St. John)
1822
1823 # Earlier this year I stumbled across a detailed article about the time
1824 # keeping history of Creston; it was written by Tammy Hardwick who is the
1825 # manager of the Creston & District Museum. The article was written in May 2009.
1826 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1827 # According to the article, Creston has not changed its clocks since June 1918.
1828 # i.e. Creston has been stuck on UTC-7 for 93 years.
1829 # Dawson Creek, on the other hand, changed its clocks as recently as April 1972.
1830
1831 # Unfortunately the exact date for the time change in June 1918 remains
1832 # unknown and will be difficult to ascertain. I e-mailed Tammy a few months
1833 # ago to ask if Sunday June 2 was a reasonable guess. She said it was just
1834 # as plausible as any other date (in June). She also said that after writing
1835 # the article she had discovered another time change in 1916; this is the
1836 # subject of another article which she wrote in October 2010.
1837 # http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56
1838
1839 # Here is a summary of the three clock change events in Creston's history:
1840 # 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7)
1841 # Exact date unknown
1842 # 2. Oct 1916: switch to Pacific Standard Time (GMT-8)
1843 # Exact date in October unknown; Sunday October 1 is a reasonable guess.
1844 # 3. June 1918: switch to Pacific Daylight Time (GMT-7)
1845 # Exact date in June unknown; Sunday June 2 is a reasonable guess.
1846 # note#1:
1847 # On Oct 27/1918 when daylight saving ended in the rest of Canada,
1848 # Creston did not change its clocks.
1849 # note#2:
1850 # During WWII when the Federal Government legislated a mandatory clock change,
1851 # Creston did not oblige.
1852 # note#3:
1853 # There is no guarantee that Creston will remain on Mountain Standard Time
1854 # (UTC-7) forever.
1855 # The subject was debated at least once this year by the town Council.
1856 # http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html
1857
1858 # During a period WWII, summer time (Daylight saying) was mandatory in Canada.
1859 # In Creston, that was handled by shifting the area to PST (-8:00) then applying
1860 # summer time to cause the offset to be -7:00, the same as it had been before
1861 # the change. It can be argued that the timezone abbreviation during this
1862 # period should be PDT rather than MST, but that doesn't seem important enough
1863 # (to anyone) to further complicate the rules.
1864
1865 # The transition dates (and times) are guesses.
1866
1867 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1868 Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1869 Rule Vanc 1918 only - Oct 27 2:00 0 S
1870 Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
1871 Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
1872 Rule Vanc 1945 only - Sep 30 2:00 0 S
1873 Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1874 Rule Vanc 1946 only - Oct 13 2:00 0 S
1875 Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1876 Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S
1890 # Northwest Territories, Nunavut, Yukon
1891
1892 # From Paul Eggert (2006-03-22):
1893 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1894 # Mathew Englander (1996-10-07) gives the following refs:
1895 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1896 # c. 7 defines Yukon standard time as UTC-9. This is still valid;
1897 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1898 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1899 # * O.I.C. 1980/02 established DST.
1900 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1901 # Shanks & Pottenger say Yukon's 1973-10-28 switch was at 2:00; go
1902 # with Englander.
1903 # From Chris Walton (2006-06-26):
1904 # Here is a link to the old daylight saving portion of the interpretation
1905 # act which was last updated in 1987:
1906 # http://www.gov.yk.ca/legislation/regs/oic1987_056.pdf
1907
1908 # From Rives McDow (1999-09-04):
1909 # Nunavut ... moved ... to incorporate the whole territory into one time zone.
1910 # Nunavut moves to single time zone Oct. 31
1911 # http://www.nunatsiaq.com/nunavut/nvt90903_13.html
1912 #
1913 # From Antoine Leca (1999-09-06):
1914 # We then need to create a new timezone for the Kitikmeot region of Nunavut
1915 # to differentiate it from the Yellowknife region.
1916
1917 # From Paul Eggert (1999-09-20):
1918 # Basic Facts: The New Territory
1919 # http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html
1920 # (1999) reports that Pangnirtung operates on eastern time,
1921 # and that Coral Harbour does not observe DST. We don't know when
1922 # Pangnirtung switched to eastern time; we'll guess 1995.
1923
1924 # From Rives McDow (1999-11-08):
1925 # On October 31, when the rest of Nunavut went to Central time,
1926 # Pangnirtung wobbled. Here is the result of their wobble:
1927 #
1928 # The following businesses and organizations in Pangnirtung use Central Time:
1929 #
1930 # First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
1931 # Eastern Arctic National Parks, A & D Specialist
1932 #
1933 # The following businesses and organizations in Pangnirtung use Eastern Time:
1934 #
1935 # Hamlet office, All other businesses, Both schools, Airport operator
1936 #
1937 # This has made for an interesting situation there, which warranted the news.
1938 # No one there that I spoke with seems concerned, or has plans to
1939 # change the local methods of keeping time, as it evidently does not
1940 # really interfere with any activities or make things difficult locally.
1941 # They plan to celebrate New Year's turn-over twice, one hour apart,
1942 # so it appears that the situation will last at least that long.
1943 # The Nunavut Intergovernmental Affairs hopes that they will "come to
1944 # their senses", but the locals evidently don't see any problem with
1945 # the current state of affairs.
1946
1947 # From Michaela Rodrigue, writing in the
1948 # Nunatsiaq News (1999-11-19):
1949 # http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html
1950 # Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
1951 # central - or Nunavut time - for government offices, and eastern time
1952 # for municipal offices and schools.... Igloolik [was similar but then]
1953 # made the switch to central time on Saturday, Nov. 6.
1954
1955 # From Paul Eggert (2000-10-02):
1956 # Matthews and Vincent (1998) say the following, but we lack histories
1957 # for these potential new Zones.
1958 #
1959 # The Canadian Forces station at Alert uses Eastern Time while the
1960 # handful of residents at the Eureka weather station [in the Central
1961 # zone] skip daylight savings. Baffin Island, which is crossed by the
1962 # Central, Eastern and Atlantic Time zones only uses Eastern Time.
1963 # Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
1964 # Central Time and Southampton Island [in the Central zone] is not
1965 # required to use daylight savings.
1966
1967 # From <http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html>
1968 # Nunavut now has two time zones (2000-11-10):
1969 # The Nunavut government would allow its employees in Kugluktuk and
1970 # Cambridge Bay to operate on central time year-round, putting them
1971 # one hour behind the rest of Nunavut for six months during the winter.
1972 # At the end of October the two communities had rebelled against
1973 # Nunavut's unified time zone, refusing to shift to eastern time with
1974 # the rest of the territory for the winter. Cambridge Bay remained on
1975 # central time, while Kugluktuk, even farther west, reverted to
1976 # mountain time, which they had used before the advent of Nunavut's
1977 # unified time zone in 1999.
1978 #
1979 # From Rives McDow (2001-01-20), quoting the Nunavut government:
1980 # The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
1981
1982 # From Paul Eggert (2000-12-04):
1983 # Let's just keep track of the official times for now.
1984
1985 # From Rives McDow (2001-03-07):
1986 # The premier of Nunavut has issued a ministerial statement advising
1987 # that effective 2001-04-01, the territory of Nunavut will revert
1988 # back to three time zones (mountain, central, and eastern). Of the
2039 # phoned the Resolute Bay hamlet office...[D]ue to the challenging nature
2040 # of the phone call, I decided to seek out an alternate source of
2041 # information. I found an e-mail address for somebody by the name of
2042 # Stephanie Adams whose job was listed as "Inns North Support Officer for
2043 # Arctic Co-operatives." I was under the impression that Stephanie lived
2044 # and worked in Resolute Bay...
2045 #
2046 # On March 14/2011 I phoned the hamlet office again. I was told that
2047 # Resolute Bay had been using Central Standard Time over the winter of
2048 # 2010-2011 and that the clocks had therefore been moved one hour ahead
2049 # on March 13/2011. The person I talked to was aware that Resolute Bay
2050 # had previously experimented with Eastern Standard Time but he could not
2051 # tell me when the practice had stopped.
2052 #
2053 # On March 17/2011 I searched the Web to find an e-mail address of
2054 # somebody that might be able to tell me exactly when Resolute Bay went
2055 # off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz
2056 # used to be the mayor of Resolute Bay and he apparently owns half the
2057 # businesses including "South Camp Inn." This website has some info on
2058 # Aziz:
2059 # http://www.uphere.ca/node/493
2060 #
2061 # I sent Aziz an e-mail asking when Resolute Bay had stopped using
2062 # Eastern Standard Time.
2063 #
2064 # Aziz responded quickly with this: "hi, The time was not changed for the
2065 # 1 year only, the following year, the community went back to the old way
2066 # of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in
2067 # the winter Zulu plus 6 hrs"
2068 #
2069 # This of course conflicted with everything I had ascertained in November 2008.
2070 #
2071 # I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz
2072 # responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You
2073 # may want to check with the weather office in Resolute Bay or do a
2074 # search on the weather through Env. Canada. web site"
2075 #
2076 # If I had realized the Stephanie did not live in Resolute Bay I would
2077 # never have contacted her. I now believe that all the information I
2078 # obtained in November 2008 should be ignored...
2079 # I apologize for reporting incorrect information in 2008.
2129 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
2130 -7:00 NT_YK M%sT 1980
2131 -7:00 Canada M%sT
2132 Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
2133 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
2134 -8:00 NT_YK P%sT 1980
2135 -8:00 Canada P%sT
2136 Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
2137 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
2138 -8:00 NT_YK P%sT 1980
2139 -8:00 Canada P%sT
2140
2141
2142 ###############################################################################
2143
2144 # Mexico
2145
2146 # From Paul Eggert (2001-03-05):
2147 # The Investigation and Analysis Service of the
2148 # Mexican Library of Congress (MLoC) has published a
2149 # history of Mexican local time (in Spanish)
2150 # http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/
2151 #
2152 # Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
2153 # (In all cases we go with the MLoC.)
2154 # S&P report that Baja was at -8:00 in 1922/1923.
2155 # S&P say the 1930 transition in Baja was 1930-11-16.
2156 # S&P report no DST during summer 1931.
2157 # S&P report a transition at 1932-03-30 23:00, not 1932-04-01.
2158
2159 # From Gwillim Law (2001-02-20):
2160 # There are some other discrepancies between the Decrees page and the
2161 # tz database. I think they can best be explained by supposing that
2162 # the researchers who prepared the Decrees page failed to find some of
2163 # the relevant documents.
2164
2165 # From Alan Perry (1996-02-15):
2166 # A guy from our Mexico subsidiary finally found the Presidential Decree
2167 # outlining the timezone changes in Mexico.
2168 #
2169 # ------------- Begin Forwarded Message -------------
2170 #
2175 # - Baja California Norte (the Mexico/BajaNorte TZ)
2176 # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
2177 # - The rest of the country (the Mexico/General TZ)
2178 #
2179 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
2180 # at 2:00 AM, the times in each zone are as follows:
2181 # BajaNorte: GMT+7
2182 # BajaSur: GMT+6
2183 # General: GMT+5
2184 #
2185 # 3. The rest of the year, the times are as follows:
2186 # BajaNorte: GMT+8
2187 # BajaSur: GMT+7
2188 # General: GMT+6
2189 #
2190 # The Decree was published in Mexico's Official Newspaper on January 4th.
2191 #
2192 # -------------- End Forwarded Message --------------
2193 # From Paul Eggert (1996-06-12):
2194 # For an English translation of the decree, see
2195 # "Diario Oficial: Time Zone Changeover" (1996-01-04).
2196 # http://mexico-travel.com/extra/timezone_eng.html
2197
2198 # From Rives McDow (1998-10-08):
2199 # The State of Quintana Roo has reverted back to central STD and DST times
2200 # (i.e. UTC -0600 and -0500 as of 1998-08-02).
2201
2202 # From Rives McDow (2000-01-10):
2203 # Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
2204 # zone 5 hours from the International Date Line, and will not observe daylight
2205 # savings time so as to stay on the same time zone as the southern part of
2206 # Arizona year round.
2207
2208 # From Jesper Nørgaard, translating
2209 # <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
2210 # In Oaxaca, the 55.000 teachers from the Section 22 of the National
2211 # Syndicate of Education Workers, refuse to apply daylight saving each
2212 # year, so that the more than 10,000 schools work at normal hour the
2213 # whole year.
2214
2215 # From Gwillim Law (2001-01-19):
2216 # <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
2217 # (translated):...
2218 # January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
2219 # that Summer Time will be reduced from seven to five months, starting
2220 # this year....
2221 # http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001
2222 # [translated], says "summer time will ... take effect on the first Sunday
2223 # in May, and end on the last Sunday of September.
2224
2225 # From Arthur David Olson (2001-01-25):
2226 # The 2001-01-24 traditional Washington Post contained the page one
2227 # story "Timely Issue Divides Mexicans."...
2228 # http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
2229 # ... Mexico City Mayor López Obrador "...is threatening to keep
2230 # Mexico City and its 20 million residents on a different time than
2231 # the rest of the country..." In particular, López Obrador would abolish
2232 # observation of Daylight Saving Time.
2233
2234 # Official statute published by the Energy Department
2235 # http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre
2236 # (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
2237 # and Sonora with no DST. This was reported by Jesper Nørgaard (2001-02-03).
2238
2239 # From Paul Eggert (2001-03-03):
2240 #
2241 # http://www.latimes.com/news/nation/20010303/t000018766.html
2242 # James F. Smith writes in today's LA Times
2243 # * Sonora will continue to observe standard time.
2244 # * Last week Mexico City's mayor Andrés Manuel López Obrador decreed that
2245 # the Federal District will not adopt DST.
2246 # * 4 of 16 district leaders announced they'll ignore the decree.
2247 # * The decree does not affect federal-controlled facilities including
2248 # the airport, banks, hospitals, and schools.
2249 #
2250 # For now we'll assume that the Federal District will bow to federal rules.
2251
2252 # From Jesper Nørgaard (2001-04-01):
2253 # I found some references to the Mexican application of daylight
2254 # saving, which modifies what I had already sent you, stating earlier
2255 # that a number of northern Mexican states would go on daylight
2256 # saving. The modification reverts this to only cover Baja California
2257 # (Norte), while all other states (except Sonora, who has no daylight
2258 # saving all year) will follow the original decree of president
2259 # Vicente Fox, starting daylight saving May 6, 2001 and ending
2260 # September 30, 2001.
2261 # References: "Diario de Monterrey" <http://www.diariodemonterrey.com/index.asp>
2262 # Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
2263
2264 # From Reuters (2001-09-04):
2265 # Mexico's Supreme Court on Tuesday declared that daylight savings was
2266 # unconstitutional in Mexico City, creating the possibility the
2267 # capital will be in a different time zone from the rest of the nation
2268 # next year.... The Supreme Court's ruling takes effect at 2:00
2269 # a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
2270 # standard time. "This is so residents of the Federal District are not
2271 # subject to unexpected time changes," a statement from the court said.
2272
2273 # From Jesper Nørgaard Welen (2002-03-12):
2274 # ... consulting my local grocery store(!) and my coworkers, they all insisted
2275 # that a new decision had been made to reinstate US style DST in Mexico....
2276 # http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
2277 # confirms this. Sonora as usual is the only state where DST is not applied.
2278
2279 # From Steffen Thorsen (2009-12-28):
2280 #
2281 # Steffen Thorsen wrote:
2282 # > Mexico's House of Representatives has approved a proposal for northern
2283 # > Mexico's border cities to share the same daylight saving schedule as
2284 # > the United States.
2285 # Now this has passed both the Congress and the Senate, so starting from
2286 # 2010, some border regions will be the same:
2287 # http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/
2288 # http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939
2289 # (Spanish)
2290 #
2291 # Could not find the new law text, but the proposed law text changes are here:
2292 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf
2293 # (Gaceta Parlamentaria)
2294 #
2295 # There is also a list of the votes here:
2296 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html
2297 #
2298 # Our page:
2299 # http://www.timeanddate.com/news/time/north-mexico-dst-change.html
2300
2301 # From Arthur David Olson (2010-01-20):
2302 # The page
2303 # http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
2304 # includes this text:
2305 # En los municipios fronterizos de Tijuana y Mexicali en Baja California;
2306 # Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila;
2307 # Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en
2308 # Tamaulipas, la aplicación de este horario estacional surtirá efecto
2309 # desde las dos horas del segundo domingo de marzo y concluirá a las dos
2310 # horas del primer domingo de noviembre.
2311 # En los municipios fronterizos que se encuentren ubicados en la franja
2312 # fronteriza norte en el territorio comprendido entre la línea
2313 # internacional y la línea paralela ubicada a una distancia de veinte
2314 # kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el
2315 # interior del país, la aplicación de este horario estacional surtirá
2316 # efecto desde las dos horas del segundo domingo de marzo y concluirá a
2317 # las dos horas del primer domingo de noviembre.
2318
2319 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2320 Rule Mexico 1939 only - Feb 5 0:00 1:00 D
2321 Rule Mexico 1939 only - Jun 25 0:00 0 S
2322 Rule Mexico 1940 only - Dec 9 0:00 1:00 D
2323 Rule Mexico 1941 only - Apr 1 0:00 0 S
2324 Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
2325 Rule Mexico 1944 only - May 1 0:00 0 S
2326 Rule Mexico 1950 only - Feb 12 0:00 1:00 D
2327 Rule Mexico 1950 only - Jul 30 0:00 0 S
2328 Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
2329 Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
2330 Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
2331 Rule Mexico 2001 only - Sep lastSun 2:00 0 S
2332 Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
2333 Rule Mexico 2002 max - Oct lastSun 2:00 0 S
2334 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2335 # Quintana Roo; represented by Cancún
2336 Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
2337 -6:00 - CST 1981 Dec 23
2338 -5:00 Mexico E%sT 1998 Aug 2 2:00
2339 -6:00 Mexico C%sT
2340 # Campeche, Yucatán; represented by Mérida
2341 Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
2342 -6:00 - CST 1981 Dec 23
2343 -5:00 - EST 1982 Dec 2
2344 -6:00 Mexico C%sT
2345 # Coahuila, Durango, Nuevo León, Tamaulipas (near US border)
2346 Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00
2347 -6:00 - CST 1988
2348 -6:00 US C%sT 1989
2349 -6:00 Mexico C%sT 2010
2350 -6:00 US C%sT
2351 # Coahuila, Durango, Nuevo León, Tamaulipas (away from US border)
2352 Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
2353 -6:00 - CST 1988
2354 -6:00 US C%sT 1989
2355 -6:00 Mexico C%sT
2356 # Central Mexico
2357 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
2358 -7:00 - MST 1927 Jun 10 23:00
2359 -6:00 - CST 1930 Nov 15
2360 -7:00 - MST 1931 May 1 23:00
2361 -6:00 - CST 1931 Oct
2362 -7:00 - MST 1932 Apr 1
2363 -6:00 Mexico C%sT 2001 Sep 30 2:00
2364 -6:00 - CST 2002 Feb 20
2365 -6:00 Mexico C%sT
2366 # Chihuahua (near US border)
2367 Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20
2368 -7:00 - MST 1927 Jun 10 23:00
2369 -6:00 - CST 1930 Nov 15
2370 -7:00 - MST 1931 May 1 23:00
2371 -6:00 - CST 1931 Oct
2372 -7:00 - MST 1932 Apr 1
2373 -6:00 - CST 1996
2374 -6:00 Mexico C%sT 1998
2375 -6:00 - CST 1998 Apr Sun>=1 3:00
2376 -7:00 Mexico M%sT 2010
2377 -7:00 US M%sT
2378 # Chihuahua (away from US border)
2379 Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
2380 -7:00 - MST 1927 Jun 10 23:00
2381 -6:00 - CST 1930 Nov 15
2382 -7:00 - MST 1931 May 1 23:00
2383 -6:00 - CST 1931 Oct
2384 -7:00 - MST 1932 Apr 1
2385 -6:00 - CST 1996
2386 -6:00 Mexico C%sT 1998
2387 -6:00 - CST 1998 Apr Sun>=1 3:00
2388 -7:00 Mexico M%sT
2389 # Sonora
2390 Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
2391 -7:00 - MST 1927 Jun 10 23:00
2392 -6:00 - CST 1930 Nov 15
2393 -7:00 - MST 1931 May 1 23:00
2394 -6:00 - CST 1931 Oct
2395 -7:00 - MST 1932 Apr 1
2396 -6:00 - CST 1942 Apr 24
2397 -7:00 - MST 1949 Jan 14
2398 -8:00 - PST 1970
2399 -7:00 Mexico M%sT 1999
2400 -7:00 - MST
2401
2402 # From Alexander Krivenyshev (2010-04-21):
2403 # According to news, Bahía de Banderas (Mexican state of Nayarit)
2404 # changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to
2405 # share the same time zone as nearby city Puerto Vallarta, Jalisco).
2406 #
2407 # (Spanish)
2408 # Bahía de Banderas homologa su horario al del centro del
2409 # país, a partir de este domingo
2410 # http://www.nayarit.gob.mx/notes.asp?id=20748
2411 #
2412 # Bahía de Banderas homologa su horario con el del Centro del
2413 # País
2414 # http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50
2415 #
2416 # (English)
2417 # Puerto Vallarta and Bahía de Banderas: One Time Zone
2418 # http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml
2419 # http://www.worldtimezone.com/dst_news/dst_news_mexico08.html
2420 #
2421 # "Mexico's Senate approved the amendments to the Mexican Schedule System that
2422 # will allow Bahía de Banderas and Puerto Vallarta to share the same time
2423 # zone ..."
2424 # Baja California Sur, Nayarit, Sinaloa
2425
2426 # From Arthur David Olson (2010-05-01):
2427 # Use "Bahia_Banderas" to keep the name to fourteen characters.
2428
2429 # Mazatlán
2430 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
2431 -7:00 - MST 1927 Jun 10 23:00
2432 -6:00 - CST 1930 Nov 15
2433 -7:00 - MST 1931 May 1 23:00
2434 -6:00 - CST 1931 Oct
2435 -7:00 - MST 1932 Apr 1
2436 -6:00 - CST 1942 Apr 24
2437 -7:00 - MST 1949 Jan 14
2438 -8:00 - PST 1970
2439 -7:00 Mexico M%sT
2440
2441 # Bahía de Banderas
2442 Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00
2443 -7:00 - MST 1927 Jun 10 23:00
2444 -6:00 - CST 1930 Nov 15
2445 -7:00 - MST 1931 May 1 23:00
2446 -6:00 - CST 1931 Oct
2447 -7:00 - MST 1932 Apr 1
2448 -6:00 - CST 1942 Apr 24
2449 -7:00 - MST 1949 Jan 14
2450 -8:00 - PST 1970
2451 -7:00 Mexico M%sT 2010 Apr 4 2:00
2452 -6:00 Mexico C%sT
2453
2454 # Baja California (near US border)
2455 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
2456 -7:00 - MST 1924
2457 -8:00 - PST 1927 Jun 10 23:00
2458 -7:00 - MST 1930 Nov 15
2459 -8:00 - PST 1931 Apr 1
2460 -8:00 1:00 PDT 1931 Sep 30
2461 -8:00 - PST 1942 Apr 24
2478 -7:00 - MST 1930 Nov 15
2479 -8:00 - PST 1931 Apr 1
2480 -8:00 1:00 PDT 1931 Sep 30
2481 -8:00 - PST 1942 Apr 24
2482 -8:00 1:00 PWT 1945 Aug 14 23:00u
2483 -8:00 1:00 PPT 1945 Nov 12 # Peace
2484 -8:00 - PST 1948 Apr 5
2485 -8:00 1:00 PDT 1949 Jan 14
2486 -8:00 - PST 1954
2487 -8:00 CA P%sT 1961
2488 -8:00 - PST 1976
2489 -8:00 US P%sT 1996
2490 -8:00 Mexico P%sT 2001
2491 -8:00 US P%sT 2002 Feb 20
2492 -8:00 Mexico P%sT
2493 # From Paul Eggert (2006-03-22):
2494 # Formerly there was an America/Ensenada zone, which differed from
2495 # America/Tijuana only in that it did not observe DST from 1976
2496 # through 1995. This was as per Shanks (1999). But Shanks & Pottenger say
2497 # Ensenada did not observe DST from 1948 through 1975. Guy Harris reports
2498 # that the 1987 OAG says "Only Ensenada, Mexicali, San Felipe and
2499 # Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
2500 # DST-observance was a town-by-town matter back then. This concerns
2501 # data after 1970 so most likely there should be at least one Zone
2502 # other than America/Tijuana for Baja, but it's not clear yet what its
2503 # name or contents should be.
2504 #
2505 # Revillagigedo Is
2506 # no information
2507
2508 ###############################################################################
2509
2510 # Anguilla
2511 # See America/Port_of_Spain.
2512
2513 # Antigua and Barbuda
2514 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2515 Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
2516 -5:00 - EST 1951
2517 -4:00 - AST
2518
2519 # Bahamas
2520 #
2521 # For 1899 Milne gives -5:09:29.5; round that.
2522 #
2523 # From Sue Williams (2006-12-07):
2524 # The Bahamas announced about a month ago that they plan to change their DST
2525 # rules to sync with the U.S. starting in 2007....
2526 # http://www.jonesbahamas.com/?c=45&a=10412
2527
2528 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2529 Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S
2530 Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D
2531 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2571 # Next year, however, clocks in the US will go forward on the second Sunday
2572 # in March, until the first Sunday in November. And, after the Time Zone
2573 # (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2574 # Friday, the same thing will happen in Bermuda.
2575 # http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2576
2577 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2578 Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton
2579 -4:00 - AST 1974 Apr 28 2:00
2580 -4:00 Canada A%sT 1976
2581 -4:00 US A%sT
2582
2583 # Cayman Is
2584 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2585 Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
2586 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
2587 -5:00 - EST
2588
2589 # Costa Rica
2590
2591 # Milne gives -5:36:13.3 as San José mean time; round to nearest.
2592
2593 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2594 Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
2595 Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
2596 Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
2597 # IATA SSIM (1991-09) says the following was at 1:00;
2598 # go with Shanks & Pottenger.
2599 Rule CR 1991 only - Jul 1 0:00 0 S
2600 Rule CR 1992 only - Mar 15 0:00 0 S
2601 # There are too many San Josés elsewhere, so we'll use 'Costa Rica'.
2602 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2603 Zone America/Costa_Rica -5:36:13 - LMT 1890 # San José
2604 -5:36:13 - SJMT 1921 Jan 15 # San José Mean Time
2605 -6:00 CR C%sT
2606 # Coco
2607 # no information; probably like America/Costa_Rica
2608
2609 # Cuba
2610
2611 # From Paul Eggert (2013-02-21):
2612 # Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57
2613 # for the port, and -5:30 for meteorological observations.
2614 # For now, stick with Shanks & Pottenger.
2615
2616 # From Arthur David Olson (1999-03-29):
2617 # The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
2618 # the Cuban National Team and the Baltimore Orioles was carried live on
2619 # the Orioles Radio Network, including affiliate WTOP in Washington, DC.
2620 # During the game, play-by-play announcer Jim Hunter noted that
2621 # "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
2622 # Time today." (The "two hour" remark referred to losing one hour of
2623 # sleep on 1999-03-28 - when the announcers were in Cuba as it switched
2624 # to DST - and one more hour on 1999-04-04 - when the announcers will have
2625 # returned to Baltimore, which switches on that date.)
2626
2627 # From Steffen Thorsen (2013-11-11):
2628 # DST start in Cuba in 2004 ... does not follow the same rules as the
2629 # years before. The correct date should be Sunday 2004-03-28 00:00 ...
2630 # https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html
2631
2632 # From Evert van der Veer via Steffen Thorsen (2004-10-28):
2633 # Cuba is not going back to standard time this year.
2634 # From Paul Eggert (2006-03-22):
2635 # http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
2636 # says that it's due to a problem at the Antonio Guiteras
2637 # thermoelectric plant, and says "This October there will be no return
2638 # to normal hours (after daylight saving time)".
2639 # For now, let's assume that it's a temporary measure.
2640
2641 # From Carlos A. Carnero Delgado (2005-11-12):
2642 # This year (just like in 2004-2005) there's no change in time zone
2643 # adjustment in Cuba. We will stay in daylight saving time:
2644 # http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html
2645
2646 # From Jesper Nørgaard Welen (2006-10-21):
2647 # An article in GRANMA INTERNACIONAL claims that Cuba will end
2648 # the 3 years of permanent DST next weekend, see
2649 # http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html
2650 # "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
2651 # watches should be set back one hour - going back to 00:00 hours - returning
2652 # to the normal schedule....
2653
2654 # From Paul Eggert (2007-03-02):
2655 # <http://www.granma.cubaweb.cu/english/news/art89.html>, dated yesterday,
2656 # says Cuban clocks will advance at midnight on March 10.
2657 # For lack of better information, assume Cuba will use US rules,
2658 # except that it switches at midnight standard time as usual.
2659 #
2660 # From Steffen Thorsen (2007-10-25):
2661 # Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
2662 # earlier - on the last Sunday of October, just like in 2006.
2663 #
2664 # He supplied these references:
2665 #
2666 # http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES
2667 # http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm
2668 #
2669 # From Alex Krivenyshev (2007-10-25):
2670 # Here is also article from Granma (Cuba):
2671 #
2672 # Regirá el Horario Normal desde el próximo domingo 28 de octubre
2673 # http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
2674 #
2675 # http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
2676
2677 # From Arthur David Olson (2008-03-09):
2678 # I'm in Maryland which is now observing United States Eastern Daylight
2679 # Time. At 9:44 local time I used RealPlayer to listen to
2680 # http://media.enet.cu/radioreloj
2681 # a Cuban information station, and heard
2682 # the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
2683 # indicating that Cuba is still on standard time.
2684
2685 # From Steffen Thorsen (2008-03-12):
2686 # It seems that Cuba will start DST on Sunday, 2007-03-16...
2687 # It was announced yesterday, according to this source (in Spanish):
2688 # http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
2689 #
2690 # Some more background information is posted here:
2691 # http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
2692 #
2693 # The article also says that Cuba has been observing DST since 1963,
2694 # while Shanks (and tzdata) has 1965 as the first date (except in the
2695 # 1940's). Many other web pages in Cuba also claim that it has been
2696 # observed since 1963, but with the exception of 1970 - an exception
2697 # which is not present in tzdata/Shanks. So there is a chance we need to
2698 # change some historic records as well.
2699 #
2700 # One example:
2701 # http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
2702
2703 # From Jesper Nørgaard Welen (2008-03-13):
2704 # The Cuban time change has just been confirmed on the most authoritative
2705 # web site, the Granma. Please check out
2706 # http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
2707 #
2708 # Basically as expected after Steffen Thorsen's information, the change
2709 # will take place midnight between Saturday and Sunday.
2710
2711 # From Arthur David Olson (2008-03-12):
2712 # Assume Sun>=15 (third Sunday) going forward.
2713
2714 # From Alexander Krivenyshev (2009-03-04)
2715 # According to the Radio Reloj - Cuba will start Daylight Saving Time on
2716 # midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009-
2717 # not on midnight March 14 / March 15 as previously thought.
2718 #
2719 # http://www.worldtimezone.com/dst_news/dst_news_cuba05.html
2720 # (in Spanish)
2721
2722 # From Arthur David Olson (2009-03-09)
2723 # I listened over the Internet to
2724 # http://media.enet.cu/readioreloj
2725 # this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
2726 # the time was announced as "diez cinco" - the same time as here, indicating
2727 # that has indeed switched to DST. Assume second Sunday from 2009 forward.
2728
2729 # From Steffen Thorsen (2011-03-08):
2730 # Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00
2731 # this year. Nothing about the end date known so far (if that has
2732 # changed at all).
2733 #
2734 # Source:
2735 # http://granma.co.cu/2011/03/08/nacional/artic01.html
2736 #
2737 # Our info:
2738 # http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html
2739 #
2740 # From Steffen Thorsen (2011-10-30)
2741 # Cuba will end DST two weeks later this year. Instead of going back
2742 # tonight, it has been delayed to 2011-11-13 at 01:00.
2743 #
2744 # One source (Spanish)
2745 # http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html
2746 #
2747 # Our page:
2748 # http://www.timeanddate.com/news/time/cuba-time-changes-2011.html
2749 #
2750 # From Steffen Thorsen (2012-03-01)
2751 # According to Radio Reloj, Cuba will start DST on Midnight between March
2752 # 31 and April 1.
2753 #
2754 # Radio Reloj has the following info (Spanish):
2755 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril
2756 #
2757 # Our info on it:
2758 # http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html
2759
2760 # From Steffen Thorsen (2012-11-03):
2761 # Radio Reloj and many other sources report that Cuba is changing back
2762 # to standard time on 2012-11-04:
2763 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre
2764 # From Paul Eggert (2012-11-03):
2765 # For now, assume the future rule is first Sunday in November.
2766
2767 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2768 Rule Cuba 1928 only - Jun 10 0:00 1:00 D
2769 Rule Cuba 1928 only - Oct 10 0:00 0 S
2770 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
2771 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
2772 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
2773 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
2774 Rule Cuba 1965 only - Jun 1 0:00 1:00 D
2775 Rule Cuba 1965 only - Sep 30 0:00 0 S
2776 Rule Cuba 1966 only - May 29 0:00 1:00 D
2777 Rule Cuba 1966 only - Oct 2 0:00 0 S
2778 Rule Cuba 1967 only - Apr 8 0:00 1:00 D
2794 Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
2795 Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S
2796 Rule Cuba 2000 2003 - Apr Sun>=1 0:00s 1:00 D
2797 Rule Cuba 2004 only - Mar lastSun 0:00s 1:00 D
2798 Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S
2799 Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D
2800 Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D
2801 Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D
2802 Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D
2803 Rule Cuba 2011 only - Nov 13 0:00s 0 S
2804 Rule Cuba 2012 only - Apr 1 0:00s 1:00 D
2805 Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S
2806 Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D
2807
2808 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2809 Zone America/Havana -5:29:28 - LMT 1890
2810 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
2811 -5:00 Cuba C%sT
2812
2813 # Dominica
2814 # See America/Port_of_Spain.
2815
2816 # Dominican Republic
2817
2818 # From Steffen Thorsen (2000-10-30):
2819 # Enrique Morales reported to me that the Dominican Republic has changed the
2820 # time zone to Eastern Standard Time as of Sunday 29 at 2 am....
2821 # http://www.listin.com.do/antes/261000/republica/princi.html
2822
2823 # From Paul Eggert (2000-12-04):
2824 # That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
2825
2826 # From Rives McDow (2000-12-01):
2827 # Dominican Republic changed its mind and presidential decree on Tuesday,
2828 # November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
2829 # Dominican Republic will be reverting to 8 hours from the International Date
2830 # Line, and will not be using DST in the foreseeable future. The reason they
2831 # decided to use DST was to be in synch with Puerto Rico, who was also going
2832 # to implement DST. When Puerto Rico didn't implement DST, the president
2833 # decided to revert.
2834
2835
2836 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2837 Rule DR 1966 only - Oct 30 0:00 1:00 D
2838 Rule DR 1967 only - Feb 28 0:00 0 S
2839 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
2840 Rule DR 1970 only - Feb 21 0:00 0 S
2841 Rule DR 1971 only - Jan 20 0:00 0 S
2842 Rule DR 1972 1974 - Jan 21 0:00 0 S
2843 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2844 Zone America/Santo_Domingo -4:39:36 - LMT 1890
2845 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
2846 -5:00 DR E%sT 1974 Oct 27
2847 -4:00 - AST 2000 Oct 29 2:00
2848 -5:00 US E%sT 2000 Dec 3 1:00
2849 -4:00 - AST
2850
2851 # El Salvador
2852
2853 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2854 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
2855 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
2856 # There are too many San Salvadors elsewhere, so use America/El_Salvador
2857 # instead of America/San_Salvador.
2858 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2859 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
2860 -6:00 Salv C%sT
2861
2862 # Grenada
2863 # Guadeloupe
2864 # St Barthélemy
2865 # St Martin (French part)
2866 # See America/Port_of_Spain.
2867
2868 # Guatemala
2869 #
2870 # From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
2871 # Diario Co Latino, at
2872 # <http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079>,
2873 # says in an article dated 2006-04-19 that the Guatemalan government had
2874 # decided on that date to advance official time by 60 minutes, to lessen the
2875 # impact of the elevated cost of oil.... Daylight saving time will last from
2876 # 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
2877 # From Paul Eggert (2006-06-22):
2878 # The Ministry of Energy and Mines, press release CP-15/2006
2879 # (2006-04-19), says DST ends at 24:00. See
2880 # http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf
2881
2882 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2883 Rule Guat 1973 only - Nov 25 0:00 1:00 D
2884 Rule Guat 1974 only - Feb 24 0:00 0 S
2885 Rule Guat 1983 only - May 21 0:00 1:00 D
2886 Rule Guat 1983 only - Sep 22 0:00 0 S
2887 Rule Guat 1991 only - Mar 23 0:00 1:00 D
2888 Rule Guat 1991 only - Sep 7 0:00 0 S
2889 Rule Guat 2006 only - Apr 30 0:00 1:00 D
2890 Rule Guat 2006 only - Oct 1 0:00 0 S
2891 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2892 Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
2893 -6:00 Guat C%sT
2894
2895 # Haiti
2896 # From Gwillim Law (2005-04-15):
2897 # Risto O. Nykänen wrote me that Haiti is now on DST.
2898 # I searched for confirmation, and I found a press release
2899 # on the Web page of the Haitian Consulate in Chicago (2005-03-31),
2900 # <http://www.haitianconsulate.org/time.doc>. Translated from French, it says:
2901 #
2902 # "The Prime Minister's Communication Office notifies the public in general
2903 # and the press in particular that, following a decision of the Interior
2904 # Ministry and the Territorial Collectivities [I suppose that means the
2905 # provinces], Haiti will move to Eastern Daylight Time in the night from next
2906 # Saturday the 2nd to Sunday the 3rd.
2907 #
2908 # "Consequently, the Prime Minister's Communication Office wishes to inform
2909 # the population that the country's clocks will be set forward one hour
2910 # starting at midnight. This provision will hold until the last Saturday in
2911 # October 2005.
2912 #
2913 # "Port-au-Prince, March 31, 2005"
2914 #
2915 # From Steffen Thorsen (2006-04-04):
2916 # I have been informed by users that Haiti observes DST this year like
2917 # last year, so the current "only" rule for 2005 might be changed to a
2918 # "max" rule or to last until 2006. (Who knows if they will observe DST
2919 # next year or if they will extend their DST like US/Canada next year).
2920 #
2957 Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
2958 Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
2959 Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S
2960 Rule Haiti 2012 max - Mar Sun>=8 2:00 1:00 D
2961 Rule Haiti 2012 max - Nov Sun>=1 2:00 0 S
2962 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2963 Zone America/Port-au-Prince -4:49:20 - LMT 1890
2964 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
2965 -5:00 Haiti E%sT
2966
2967 # Honduras
2968 # Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.
2969
2970 # From Paul Eggert (2006-05-05):
2971 # worldtimezone.com reports a 2006-05-02 Spanish-language AP article
2972 # saying Honduras will start using DST midnight Saturday, effective 4
2973 # months until September. La Tribuna reported today
2974 # <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president
2975 # of Honduras, refused to back down on this.
2976
2977 # From Jesper Nørgaard Welen (2006-08-08):
2978 # It seems that Honduras has returned from DST to standard time this Monday at
2979 # 00:00 hours (prolonging Sunday to 25 hours duration).
2980 # http://www.worldtimezone.com/dst_news/dst_news_honduras04.html
2981
2982 # From Paul Eggert (2006-08-08):
2983 # Also see Diario El Heraldo, The country returns to standard time (2006-08-08).
2984 # http://www.elheraldo.hn/nota.php?nid=54941&sec=12
2985 # It mentions executive decree 18-2006.
2986
2987 # From Steffen Thorsen (2006-08-17):
2988 # Honduras will observe DST from 2007 to 2009, exact dates are not
2989 # published, I have located this authoritative source:
2990 # http://www.presidencia.gob.hn/noticia.aspx?nId=47
2991
2992 # From Steffen Thorsen (2007-03-30):
2993 # http://www.laprensahn.com/pais_nota.php?id04962=7386
2994 # So it seems that Honduras will not enter DST this year....
2995
2996 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2997 Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D
2998 Rule Hond 1987 1988 - Sep lastSun 0:00 0 S
2999 Rule Hond 2006 only - May Sun>=1 0:00 1:00 D
3000 Rule Hond 2006 only - Aug Mon>=1 0:00 0 S
3001 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3002 Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
3003 -6:00 Hond C%sT
3004 #
3007 # Jamaica
3008 # Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
3009 # unspecified official document, and says "This time is used throughout the
3010 # island". Go with Milne. Round to the nearest second as required by zic.
3011 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3012 Zone America/Jamaica -5:07:11 - LMT 1890 # Kingston
3013 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3014 -5:00 - EST 1974 Apr 28 2:00
3015 -5:00 US E%sT 1984
3016 -5:00 - EST
3017
3018 # Martinique
3019 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3020 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
3021 -4:04:20 - FFMT 1911 May # Fort-de-France MT
3022 -4:00 - AST 1980 Apr 6
3023 -4:00 1:00 ADT 1980 Sep 28
3024 -4:00 - AST
3025
3026 # Montserrat
3027 # See America/Port_of_Spain.
3028
3029 # Nicaragua
3030 #
3031 # This uses Shanks & Pottenger for times before 2005.
3032 #
3033 # From Steffen Thorsen (2005-04-12):
3034 # I've got reports from 8 different people that Nicaragua just started
3035 # DST on Sunday 2005-04-10, in order to save energy because of
3036 # expensive petroleum. The exact end date for DST is not yet
3037 # announced, only "September" but some sites also say "mid-September".
3038 # Some background information is available on the President's official site:
3039 # http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
3040 # The Decree, no 23-2005 is available here:
3041 # http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2005/Decreto%2023-2005%20Se%20adelanta%20en%20una%20hora%20en%20todo%20el%20territorio%20nacional%20apartir%20de%20las%2024horas%20del%2009%20de%20Abril.pdf
3042 #
3043 # From Paul Eggert (2005-05-01):
3044 # The decree doesn't say anything about daylight saving, but for now let's
3045 # assume that it is daylight saving....
3046 #
3047 # From Gwillim Law (2005-04-21):
3048 # The Associated Press story on the time change, which can be found at
3049 # http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
3050 # and elsewhere, says (fifth paragraph, translated from Spanish): "The last
3051 # time that a change of clocks was applied to save energy was in the year 2000
3052 # during the Arnoldo Alemán administration."...
3053 # The northamerica file says that Nicaragua has been on UTC-6 continuously
3054 # since December 1998. I wasn't able to find any details of Nicaraguan time
3055 # changes in 2000. Perhaps a note could be added to the northamerica file, to
3056 # the effect that we have indirect evidence that DST was observed in 2000.
3057 #
3058 # From Jesper Nørgaard Welen (2005-11-02):
3059 # Nicaragua left DST the 2005-10-02 at 00:00 (local time).
3060 # http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
3061 # (2005-09-26)
3062 #
3063 # From Jesper Nørgaard Welen (2006-05-05):
3064 # http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410
3065 # (my informal translation)
3066 # By order of the president of the republic, Enrique Bolaños, Nicaragua
3067 # advanced by sixty minutes their official time, yesterday at 2 in the
3068 # morning, and will stay that way until 30th of September.
3069 #
3070 # From Jesper Nørgaard Welen (2006-09-30):
3071 # http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf
3072 # My informal translation runs:
3073 # The natural sun time is restored in all the national territory, in that the
3074 # time is returned one hour at 01:00 am of October 1 of 2006.
3075 #
3076 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3077 Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
3078 Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
3079 Rule Nic 2005 only - Apr 10 0:00 1:00 D
3080 Rule Nic 2005 only - Oct Sun>=1 0:00 0 S
3081 Rule Nic 2006 only - Apr 30 2:00 1:00 D
3082 Rule Nic 2006 only - Oct Sun>=1 1:00 0 S
3083 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3084 Zone America/Managua -5:45:08 - LMT 1890
3085 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
3086 -6:00 - CST 1973 May
3087 -5:00 - EST 1975 Feb 16
3088 -6:00 Nic C%sT 1992 Jan 1 4:00
3089 -5:00 - EST 1992 Sep 24
3090 -6:00 - CST 1993
3091 -5:00 - EST 1997
3092 -6:00 Nic C%sT
3093
3094 # Panama
3095 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3096 Zone America/Panama -5:18:08 - LMT 1890
3097 -5:19:36 - CMT 1908 Apr 22 # Colón Mean Time
3098 -5:00 - EST
3099
3100 # Puerto Rico
3101 # There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
3102 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3103 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
3104 -4:00 - AST 1942 May 3
3105 -4:00 US A%sT 1946
3106 -4:00 - AST
3107
3108 # St Kitts-Nevis
3109 # St Lucia
3110 # See America/Port_of_Spain.
3111
3112 # St Pierre and Miquelon
3113 # There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
3114 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3115 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3116 -4:00 - AST 1980 May
3117 -3:00 - PMST 1987 # Pierre & Miquelon Time
3118 -3:00 Canada PM%sT
3119
3120 # St Vincent and the Grenadines
3121 # See America/Port_of_Spain.
3122
3123 # Turks and Caicos
3124 #
3125 # From Chris Dunn in
3126 # http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007
3127 # (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
3128 # daylight saving dates for time changes have been adjusted to match
3129 # the recent U.S. change of dates.
3130 #
3131 # From Brian Inglis (2007-04-28):
3132 # http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
3133 # there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
3134 # rows before that there is an out of date entry for Oct:
3135 # "Eastern Standard Times Begins 2007
3136 # Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
3137 # indicating that the normal ET rules are followed.
3138 #
3139 # From Paul Eggert (2014-08-19):
3140 # The 2014-08-13 Cabinet meeting decided to stay on UTC-4 year-round. See:
3141 # http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm
3142 # Model this as a switch from EST/EDT to AST on 2014-11-02 at 02:00.
3143 #
3144 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3145 Zone America/Grand_Turk -4:44:32 - LMT 1890
3146 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3147 -5:00 - EST 1979
3148 -5:00 US E%sT 2014 Nov 2 2:00
3149 -4:00 - AST
3150
3151 # British Virgin Is
3152 # Virgin Is
3153 # See America/Port_of_Spain.
3154
3155
3156 # Local Variables:
3157 # coding: utf-8
3158 # End:
|