1 #
2 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 #
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
53 # From Paul Eggert (2005-04-16):
54 # That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
55 # See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
56
57 # From Paul Eggert (2006-03-22):
58 # A good source for time zone historical data in the US is
59 # Thomas G. Shanks, The American Atlas (5th edition),
60 # San Diego: ACS Publications, Inc. (1991).
61 # Make sure you have the errata sheet; the book is somewhat useless without it.
62 # It is the source for most of the pre-1991 US entries below.
63
64 # From Paul Eggert (2001-03-06):
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."
131 #
132 # On Aug. 14, stalling while talking steadily into the NBC networks' open
133 # microphone, St. John heard five bells and waited only to hear a sixth bell,
134 # before announcing confidently: "Ladies and gentlemen, World War II is over.
135 # The Japanese have agreed to our surrender terms."
136 #
137 # He had scored a 20-second scoop on other broadcasters.
138
139 # From Arthur David Olson (2005-08-22):
140 # Paul has been careful to use the "US" rules only in those locations
141 # that are part of the United States; this reflects the real scope of
142 # U.S. government action. So even though the "US" rules have changed
143 # in the latest release, other countries won't be affected.
144
145 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
146 Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
147 Rule US 1918 1919 - Oct lastSun 2:00 0 S
148 Rule US 1942 only - Feb 9 2:00 1:00 W # War
149 Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace
150 Rule US 1945 only - Sep 30 2:00 0 S
151 Rule US 1967 2006 - Oct lastSun 2:00 0 S
152 Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
153 Rule US 1974 only - Jan 6 2:00 1:00 D
154 Rule US 1975 only - Feb 23 2:00 1:00 D
155 Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
156 Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D
157 Rule US 2007 max - Mar Sun>=8 2:00 1:00 D
158 Rule US 2007 max - Nov Sun>=1 2:00 0 S
159
160 # From Arthur David Olson, 2005-12-19
161 # We generate the files specified below to guard against old files with
162 # obsolete information being left in the time zone binary directory.
163 # We limit the list to names that have appeared in previous versions of
164 # this time zone package.
165 # We do these as separate Zones rather than as Links to avoid problems if
166 # a particular place changes whether it observes DST.
167 # We put these specifications here in the northamerica file both to
168 # increase the chances that they'll actually get compiled and to
169 # avoid the need to duplicate the US rules in another file.
170
171 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
172 Zone EST -5:00 - EST
173 Zone MST -7:00 - MST
174 Zone HST -10:00 - HST
175 Zone EST5EDT -5:00 US E%sT
176 Zone CST6CDT -6:00 US C%sT
177 Zone MST7MDT -7:00 US M%sT
178 Zone PST8PDT -8:00 US P%sT
179
180 # From Bob Devine (1988-01-28):
181 # ...Alaska (and Hawaii) had the timezone names changed in 1967.
182 # old new
183 # Pacific Standard Time(PST) -same-
184 # Yukon Standard Time(YST) -same-
185 # Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
186 # Nome Standard Time (NT) Bering Standard Time (BST)
187 #
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)
229 # United States standard Alaska time
230 # (none)
231 # Next, names from 1967-04-01 until 1983-11-30 (the date for
232 # public law 98-181):
233 # Atlantic standard time
234 # eastern standard time
235 # central standard time
236 # mountain standard time
237 # Pacific standard time
238 # Yukon standard time
239 # Alaska-Hawaii standard time
240 # Bering standard time
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
316
317 # US central time, represented by Chicago
318
319 # Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia,
320 # Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and
321 # Washington counties), Illinois, western Indiana
322 # (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
323 # Vanderburgh, and Warrick counties), Iowa, most of Kansas, western
324 # Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern
325 # Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota,
326 # western Tennessee, most of Texas, Wisconsin
327
328 # From Larry M. Smith (2006-04-26) re Wisconsin:
329 # http://www.legis.state.wi.us/statutes/Stat0175.pdf ...
330 # is currently enforced at the 01:00 time of change. Because the local
331 # "bar time" in the state corresponds to 02:00, a number of citations
332 # are issued for the "sale of class 'B' alcohol after prohibited
333 # hours" within the deviated hour of this change every year....
334 #
335 # From Douglas R. Bomberg (2007-03-12):
336 # Wisconsin has enacted (nearly eleventh-hour) legislation to get WI
337 # Statue 175 closer in synch with the US Congress' intent....
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]
407 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04
408 -7:00 US M%sT 1920
409 -7:00 Denver M%sT 1942
410 -7:00 US M%sT 1946
411 -7:00 Denver M%sT 1967
412 -7:00 US M%sT
413
414 # US Pacific time, represented by Los Angeles
415 #
416 # California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
417 # Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties,
418 # and the northern three-quarters of Idaho county),
419 # most of Nevada, most of Oregon, and Washington
420 #
421 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
422 Rule CA 1948 only - Mar 14 2:00 1:00 D
423 Rule CA 1949 only - Jan 1 2:00 0 S
424 Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
425 Rule CA 1950 1961 - Sep lastSun 2:00 0 S
426 Rule CA 1962 1966 - Oct lastSun 2:00 0 S
427 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
428 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02
429 -8:00 US P%sT 1946
430 -8:00 CA P%sT 1967
431 -8:00 US P%sT
432
433 # Alaska
434 # AK%sT is the modern abbreviation for -9:00 per USNO.
435 #
436 # From Paul Eggert (2001-05-30):
437 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
438 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
439 # This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
440 # also a Friday. Include only the time zone part of this transition,
441 # ignoring the switch from Julian to Gregorian, since we can't represent
442 # the Julian calendar.
443 #
444 # As far as we know, none of the exact locations mentioned below were
445 # permanently inhabited in 1867 by anyone using either calendar.
446 # (Yakutat was colonized by the Russians in 1799, but the settlement
447 # was destroyed in 1805 by a Yakutat-kon war party.) However, there
448 # were nearby inhabitants in some cases and for our purposes perhaps
449 # it's best to simply use the official transition.
450 #
451
452 # From Steve Ferguson (2011-01-31):
453 # The author lives in Alaska and many of the references listed are only
454 # available to Alaskan residents.
455 #
456 # <a href="http://www.alaskahistoricalsociety.org/index.cfm?section=discover%20alaska&page=Glimpses%20of%20the%20Past&viewpost=2&ContentId=98">
457 # http://www.alaskahistoricalsociety.org/index.cfm?section=discover%20alaska&page=Glimpses%20of%20the%20Past&viewpost=2&ContentId=98
458 # </a>
459
460 # From Arthur David Olson (2011-02-01):
461 # Here's database-relevant material from the 2001 "Alaska History" article:
462 #
463 # On September 20 [1979]...DOT...officials decreed that on April 27,
464 # 1980, Juneau and other nearby communities would move to Yukon Time.
465 # Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on
466 # Pacific Time.
467 #
468 # ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the
469 # Department's September 1979 decision. Juneau and other communities in
470 # northern Southeast reverted to Pacific Time on October 26.
471 #
472 # On October 28 [1983]...the Metlakatla Indian Community Council voted
473 # unanimously to keep the reservation on Pacific Time.
474 #
475 # According to DOT official Joanne Petrie, Indian reservations are not
476 # bound to follow time zones imposed by neighboring jurisdictions.
477 #
478 # (The last is consistent with how the database now handles the Navajo
479 # Nation.)
480
481 # From Arthur David Olson (2011-02-09):
482 # I just spoke by phone with a staff member at the Metlakatla Indian
483 # Community office (using contact information available at
484 # <a href="http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla">
485 # http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla
486 # </a>).
487 # It's shortly after 1:00 here on the east coast of the United States;
488 # the staffer said it was shortly after 10:00 there. When I asked whether
489 # that meant they were on Pacific time, they said no--they were on their
490 # own time. I asked about daylight saving; they said it wasn't used. I
491 # did not inquire about practices in the past.
492
493 # From Arthur David Olson (2011-08-17):
494 # For lack of better information, assume that Metlakatla's
495 # abandonment of use of daylight saving resulted from the 1983 vote.
496
497 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
498 Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
499 -8:57:41 - LMT 1900 Aug 20 12:00
500 -8:00 - PST 1942
501 -8:00 US P%sT 1946
502 -8:00 - PST 1969
503 -8:00 US P%sT 1980 Apr 27 2:00
504 -9:00 US Y%sT 1980 Oct 26 2:00
505 -8:00 US P%sT 1983 Oct 30 2:00
506 -9:00 US Y%sT 1983 Nov 30
507 -9:00 US AK%sT
508 Zone America/Sitka 14:58:47 - LMT 1867 Oct 18
509 -9:01:13 - LMT 1900 Aug 20 12:00
510 -8:00 - PST 1942
511 -8:00 US P%sT 1946
512 -8:00 - PST 1969
513 -8:00 US P%sT 1983 Oct 30 2:00
514 -9:00 US Y%sT 1983 Nov 30
515 -9:00 US AK%sT
516 Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18
517 -8:46:18 - LMT 1900 Aug 20 12:00
518 -8:00 - PST 1942
519 -8:00 US P%sT 1946
520 -8:00 - PST 1969
521 -8:00 US P%sT 1983 Oct 30 2:00
522 -8:00 - MeST
523 Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
524 -9:18:55 - LMT 1900 Aug 20 12:00
525 -9:00 - YST 1942
526 -9:00 US Y%sT 1946
527 -9:00 - YST 1969
528 -9:00 US Y%sT 1983 Nov 30
529 -9:00 US AK%sT
530 Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
531 -9:59:36 - LMT 1900 Aug 20 12:00
532 -10:00 - CAT 1942
533 -10:00 US CAT/CAWT 1945 Aug 14 23:00u
534 -10:00 US CAT/CAPT 1946 # Peace
535 -10:00 - CAT 1967 Apr
536 -10:00 - AHST 1969
537 -10:00 US AH%sT 1983 Oct 30 2:00
538 -9:00 US Y%sT 1983 Nov 30
539 -9:00 US AK%sT
540 Zone America/Nome 12:58:21 - LMT 1867 Oct 18
541 -11:01:38 - LMT 1900 Aug 20 12:00
542 -11:00 - NST 1942
543 -11:00 US N%sT 1946
544 -11:00 - NST 1967 Apr
545 -11:00 - BST 1969
546 -11:00 US B%sT 1983 Oct 30 2:00
547 -9:00 US Y%sT 1983 Nov 30
548 -9:00 US AK%sT
549 Zone America/Adak 12:13:21 - LMT 1867 Oct 18
550 -11:46:38 - LMT 1900 Aug 20 12:00
551 -11:00 - NST 1942
552 -11:00 US N%sT 1946
553 -11:00 - NST 1967 Apr
554 -11:00 - BST 1969
555 -11:00 US B%sT 1983 Oct 30 2:00
556 -10:00 US AH%sT 1983 Nov 30
557 -10:00 US HA%sT
558 # The following switches don't quite make our 1970 cutoff.
559 #
560 # Shanks writes that part of southwest Alaska (e.g. Aniak)
561 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
562 # and another part (e.g. Akiak) made the same switch five weeks later.
563 #
564 # From David Flater (2004-11-09):
565 # In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
566 # Historic Preservation Commission, provided this information, which
567 # suggests that Unalaska deviated from statutory time from early 1967
568 # possibly until 1983:
569 #
570 # Minutes of the Unalaska City Council Meeting, January 10, 1967:
571 # "Except for St. Paul and Akutan, Unalaska is the only important
572 # location not on Alaska Standard Time. The following resolution was
573 # made by William Robinson and seconded by Henry Swanson: Be it
574 # resolved that the City of Unalaska hereby goes to Alaska Standard
575 # Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
576 # January 14, Alaska Standard Time.) This resolution was passed with
577 # three votes for and one against."
578
579 # Hawaii
580
581 # From Arthur David Olson (2010-12-09):
582 # "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225
583 # of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09,
584 # the article is available at
585 # <a href="http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf">
586 # http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf
587 # </a>
588 # and indicates that standard time was adopted effective noon, January
589 # 13, 1896 (page 218), that in "1933, the Legislature decreed daylight
590 # saving for the period between the last Sunday of each April and the
591 # last Sunday of each September, but less than a month later repealed the
592 # act," (page 220), that year-round daylight saving time was in effect
593 # from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for
594 # when clocks changed) and that clocks were changed by 30 minutes
595 # effective the second Sunday of June, 1947 (page 219, with no time of
596 # day given for when clocks changed). A footnote for the 1933 changes
597 # cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933)
598 # and Act 163 (approved 21 May 1933)."
599
600 # From Arthur David Olson (2011-01-19):
601 # The following is from "Laws of the Territory of Hawaii Passed by the
602 # Seventeenth Legislature: Regular Session 1933," available (as of
603 # 2011-01-19) at American University's Pence Law Library. Page 85: "Act
604 # 90...At 2 o'clock ante meridian of the last Sunday in April of each
605 # year, the standard time of this Territory shall be advanced one
606 # hour...This Act shall take effect upon its approval. Approved this 26th
607 # day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
608 # Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is
609 # hereby repealed...This Act shall take effect upon its approval, upon
610 # which date the standard time of this Territory shall be restored to
611 # that existing immediately prior to the taking effect of said Act 90.
612 # Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
613 # of the Territory of Hawaii."
614 #
615 # Note that 1933-05-21 was a Sunday.
616 # We're left to guess the time of day when Act 163 was approved; guess noon.
617
618 Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 #Schmitt&Cox
619 -10:30 - HST 1933 Apr 30 2:00 #Laws 1933
620 -10:30 1:00 HDT 1933 May 21 12:00 #Laws 1933+12
621 -10:30 - HST 1942 Feb 09 2:00 #Schmitt&Cox+2
622 -10:30 1:00 HDT 1945 Sep 30 2:00 #Schmitt&Cox+2
623 -10:30 - HST 1947 Jun 8 2:00 #Schmitt&Cox+2
624 -10:00 - HST
625
626 # Now we turn to US areas that have diverged from the consensus since 1970.
627
628 # Arizona mostly uses MST.
629
630 # From Paul Eggert (2002-10-20):
631 #
632 # The information in the rest of this paragraph is derived from the
633 # <a href="http://www.dlapr.lib.az.us/links/daylight.htm">
634 # Daylight Saving Time web page (2002-01-23)</a> maintained by the
635 # Arizona State Library, Archives and Public Records.
636 # Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
637 # time, but by federal law railroads, airlines, bus lines, military
638 # personnel, and some engaged in interstate commerce continued to
639 # observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
640 # Gazette says that was the date the law changed, and that 04-01 was
641 # the date the state's clocks would change. In 1945 the State of
642 # Arizona used standard time all year, again with exceptions only as
643 # mandated by federal law. Arizona observed DST in 1967, but Arizona
644 # Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
645 #
646 # Shanks says the 1944 experiment came to an end on 1944-03-17.
647 # Go with the Arizona State Library instead.
648
649 Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42
650 -7:00 US M%sT 1944 Jan 1 00:01
651 -7:00 - MST 1944 Apr 1 00:01
652 -7:00 US M%sT 1944 Oct 1 00:01
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 Link America/Denver America/Shiprock
664
665 # Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
666 # Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
667 # Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
668 # Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
669 # Teton, Twin Falls, Valley, Washington counties, and the southern
670 # quarter of Idaho county) and eastern Oregon (most of Malheur County)
671 # switched four weeks late in 1974.
672 #
673 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
674 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
675 -8:00 US P%sT 1923 May 13 2:00
676 -7:00 US M%sT 1974
677 -7:00 - MST 1974 Feb 3 2:00
678 -7:00 US M%sT
679
680 # Indiana
681 #
682 # For a map of Indiana's time zone regions, see:
683 # <a href="http://www.mccsc.edu/time.html">
684 # What time is it in Indiana?
685 # </a> (2006-03-01)
686 #
687 # From Paul Eggert (2007-08-17):
688 # Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
689 # with the following exceptions:
690 #
691 # - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
692 # Vandenburgh, and Warrick counties have been like America/Chicago.
693 #
694 # - Dearborn and Ohio counties have been like America/New_York.
695 #
696 # - Clark, Floyd, and Harrison counties have been like
697 # America/Kentucky/Louisville.
698 #
699 # - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
700 # and Switzerland counties have their own time zone histories as noted below.
701 #
702 # Shanks partitioned Indiana into 345 regions, each with its own time history,
703 # and wrote ``Even newspaper reports present contradictory information.''
704 # Those Hoosiers! Such a flighty and changeable people!
705 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
706 #
707 # Other than Indianapolis, the Indiana place names are so nondescript
708 # that they would be ambiguous if we left them at the `America' level.
709 # So we reluctantly put them all in a subdirectory `America/Indiana'.
710
711 # From Paul Eggert (2005-08-16):
712 # http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006.
713
714 # From Nathan Stratton Treadway (2006-03-30):
715 # http://www.dot.gov/affairs/dot0406.htm [3705 B]
716 # From Deborah Goldsmith (2006-01-18):
717 # http://dmses.dot.gov/docimages/pdf95/382329_web.pdf [2.9 MB]
718 # From Paul Eggert (2006-01-20):
719 # It says "DOT is relocating the time zone boundary in Indiana to move Starke,
720 # Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
721 # Eastern Time Zone to the Central Time Zone.... The effective date of
722 # this rule is 2:OO a.m. EST Sunday, April 2, 2006, which is the
723 # changeover date from standard time to Daylight Saving Time."
724 # Strictly speaking, this means the affected counties will change their
725 # clocks twice that night, but this obviously is in error. The intent
726 # is that 01:59:59 EST be followed by 02:00:00 CDT.
727
728 # From Gwillim Law (2007-02-10):
729 # The Associated Press has been reporting that Pulaski County, Indiana is
730 # going to switch from Central to Eastern Time on March 11, 2007....
731 # http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL
732
733 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
734 Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
735 Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
736 Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
737 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
738 Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22
739 -6:00 US C%sT 1920
740 -6:00 Indianapolis C%sT 1942
741 -6:00 US C%sT 1946
742 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
743 -5:00 - EST 1957 Sep 29 2:00
744 -6:00 - CST 1958 Apr 27 2:00
745 -5:00 - EST 1969
746 -5:00 US E%sT 1971
747 -5:00 - EST 2006
748 -5:00 US E%sT
749 #
750 # Eastern Crawford County, Indiana, left its clocks alone in 1974,
751 # as well as from 1976 through 2005.
752 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
753 Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
754 Rule Marengo 1951 only - Sep lastSun 2:00 0 S
755 Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
756 Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
757 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
758 Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37
759 -6:00 US C%sT 1951
760 -6:00 Marengo C%sT 1961 Apr 30 2:00
761 -5:00 - EST 1969
762 -5:00 US E%sT 1974 Jan 6 2:00
763 -6:00 1:00 CDT 1974 Oct 27 2:00
764 -5:00 US E%sT 1976
765 -5:00 - EST 2006
766 -5:00 US E%sT
767 #
768 # Daviess, Dubois, Knox, and Martin Counties, Indiana,
769 # switched from eastern to central time in April 2006, then switched back
770 # in November 2007.
771 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
772 Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D
773 Rule Vincennes 1946 only - Sep lastSun 2:00 0 S
774 Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D
775 Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S
776 Rule Vincennes 1955 only - May 1 0:00 1:00 D
777 Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D
778 Rule Vincennes 1960 only - Oct lastSun 2:00 0 S
779 Rule Vincennes 1961 only - Sep lastSun 2:00 0 S
780 Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S
781 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
782 Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53
783 -6:00 US C%sT 1946
784 -6:00 Vincennes C%sT 1964 Apr 26 2:00
785 -5:00 - EST 1969
786 -5:00 US E%sT 1971
787 -5:00 - EST 2006 Apr 2 2:00
788 -6:00 US C%sT 2007 Nov 4 2:00
789 -5:00 US E%sT
790 #
791 # Perry County, Indiana, switched from eastern to central time in April 2006.
792 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
793 Rule Perry 1946 only - Apr lastSun 2:00 1:00 D
794 Rule Perry 1946 only - Sep lastSun 2:00 0 S
795 Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D
796 Rule Perry 1953 1959 - Sep lastSun 2:00 0 S
797 Rule Perry 1955 only - May 1 0:00 1:00 D
798 Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D
799 Rule Perry 1960 only - Oct lastSun 2:00 0 S
800 Rule Perry 1961 only - Sep lastSun 2:00 0 S
801 Rule Perry 1962 1963 - Oct lastSun 2:00 0 S
802 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
803 Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57
804 -6:00 US C%sT 1946
805 -6:00 Perry C%sT 1964 Apr 26 2:00
806 -5:00 - EST 1969
807 -5:00 US E%sT 1971
808 -5:00 - EST 2006 Apr 2 2:00
809 -6:00 US C%sT
810 #
811 # Pike County, Indiana moved from central to eastern time in 1977,
812 # then switched back in 2006, then switched back again in 2007.
813 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
814 Rule Pike 1955 only - May 1 0:00 1:00 D
815 Rule Pike 1955 1960 - Sep lastSun 2:00 0 S
816 Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D
817 Rule Pike 1961 1964 - Oct lastSun 2:00 0 S
818 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
819 Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53
820 -6:00 US C%sT 1955
821 -6:00 Pike C%sT 1965 Apr 25 2:00
822 -5:00 - EST 1966 Oct 30 2:00
823 -6:00 US C%sT 1977 Oct 30 2:00
824 -5:00 - EST 2006 Apr 2 2:00
825 -6:00 US C%sT 2007 Nov 4 2:00
826 -5:00 US E%sT
827 #
828 # Starke County, Indiana moved from central to eastern time in 1991,
829 # then switched back in 2006.
830 # From Arthur David Olson (1991-10-28):
831 # An article on page A3 of the Sunday, 1991-10-27 Washington Post
832 # notes that Starke County switched from Central time to Eastern time as of
833 # 1991-10-27.
834 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
835 Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
836 Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
837 Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
838 Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
839 Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
840 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
841 Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30
842 -6:00 US C%sT 1947
843 -6:00 Starke C%sT 1962 Apr 29 2:00
844 -5:00 - EST 1963 Oct 27 2:00
845 -6:00 US C%sT 1991 Oct 27 2:00
846 -5:00 - EST 2006 Apr 2 2:00
847 -6:00 US C%sT
848 #
849 # Pulaski County, Indiana, switched from eastern to central time in
850 # April 2006 and then switched back in March 2007.
851 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
852 Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D
853 Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S
854 Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S
855 Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S
856 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
857 Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35
858 -6:00 US C%sT 1946
859 -6:00 Pulaski C%sT 1961 Apr 30 2:00
860 -5:00 - EST 1969
861 -5:00 US E%sT 1971
862 -5:00 - EST 2006 Apr 2 2:00
863 -6:00 US C%sT 2007 Mar 11 2:00
864 -5:00 US E%sT
865 #
866 # Switzerland County, Indiana, did not observe DST from 1973 through 2005.
867 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
868 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
869 -6:00 US C%sT 1954 Apr 25 2:00
870 -5:00 - EST 1969
871 -5:00 US E%sT 1973
872 -5:00 - EST 2006
873 -5:00 US E%sT
874
875 # Part of Kentucky left its clocks alone in 1974.
876 # This also includes Clark, Floyd, and Harrison counties in Indiana.
877 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
878 Rule Louisville 1921 only - May 1 2:00 1:00 D
879 Rule Louisville 1921 only - Sep 1 2:00 0 S
880 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
881 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
882 Rule Louisville 1946 only - Jun 2 2:00 0 S
883 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
884 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
885 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
886 Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
887 -6:00 US C%sT 1921
888 -6:00 Louisville C%sT 1942
889 -6:00 US C%sT 1946
890 -6:00 Louisville C%sT 1961 Jul 23 2:00
891 -5:00 - EST 1968
892 -5:00 US E%sT 1974 Jan 6 2:00
893 -6:00 1:00 CDT 1974 Oct 27 2:00
894 -5:00 US E%sT
895 #
896 # Wayne County, Kentucky
897 #
898 # From
899 # <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml">
900 # Lake Cumberland LIFE
901 # </a> (1999-01-29) via WKYM-101.7:
902 # Clinton County has joined Wayne County in asking the DoT to change from
903 # the Central to the Eastern time zone.... The Wayne County government made
904 # the same request in December. And while Russell County officials have not
905 # taken action, the majority of respondents to a poll conducted there in
906 # August indicated they would like to change to "fast time" also.
907 # The three Lake Cumberland counties are the farthest east of any U.S.
908 # location in the Central time zone.
909 #
910 # From Rich Wales (2000-08-29):
911 # After prolonged debate, and despite continuing deep differences of opinion,
912 # Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
913 # (-0500) time. They won't "fall back" this year. See Sara Shipley,
914 # The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
915 #
916 # From Paul Eggert (2001-07-16):
917 # The final rule was published in the
918 # <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22">
919 # Federal Register 65, 160 (2000-08-17), page 50154-50158.
920 # </a>
921 #
922 Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
923 -6:00 US C%sT 1946
924 -6:00 - CST 1968
925 -6:00 US C%sT 2000 Oct 29 2:00
926 -5:00 US E%sT
927
928
929 # From Rives McDow (2000-08-30):
930 # Here ... are all the changes in the US since 1985.
931 # Kearny County, KS (put all of county on central;
932 # previously split between MST and CST) ... 1990-10
933 # Starke County, IN (from CST to EST) ... 1991-10
934 # Oliver County, ND (from MST to CST) ... 1992-10
935 # West Wendover, NV (from PST TO MST) ... 1999-10
936 # Wayne County, KY (from CST to EST) ... 2000-10
937 #
938 # From Paul Eggert (2001-07-17):
939 # We don't know where the line used to be within Kearny County, KS,
940 # so omit that change for now.
941 # See America/Indiana/Knox for the Starke County, IN change.
942 # See America/North_Dakota/Center for the Oliver County, ND change.
943 # West Wendover, NV officially switched from Pacific to mountain time on
944 # 1999-10-31. See the
945 # <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15">
946 # Federal Register 64, 203 (1999-10-21), page 56705-56707.
947 # </a>
948 # However, the Federal Register says that West Wendover already operated
949 # on mountain time, and the rule merely made this official;
950 # hence a separate tz entry is not needed.
951
952 # Michigan
953 #
954 # From Bob Devine (1988-01-28):
955 # Michigan didn't observe DST from 1968 to 1973.
956 #
957 # From Paul Eggert (1999-03-31):
958 # Shanks writes that Michigan started using standard time on 1885-09-18,
959 # but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
960 # that Detroit kept
961 #
962 # local time until 1900 when the City Council decreed that clocks should
963 # be put back twenty-eight minutes to Central Standard Time. Half the
964 # city obeyed, half refused. After considerable debate, the decision
965 # was rescinded and the city reverted to Sun time. A derisive offer to
966 # erect a sundial in front of the city hall was referred to the
967 # Committee on Sewers. Then, in 1905, Central time was adopted
968 # by city vote.
969 #
970 # This story is too entertaining to be false, so go with Howse over Shanks.
971 #
972 # From Paul Eggert (2001-03-06):
973 # Garland (1927) writes ``Cleveland and Detroit advanced their clocks
974 # one hour in 1914.'' This change is not in Shanks. We have no more
975 # info, so omit this for now.
976 #
977 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
978 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
979 Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
980 Rule Detroit 1948 only - Sep lastSun 2:00 0 S
981 Rule Detroit 1967 only - Jun 14 2:00 1:00 D
982 Rule Detroit 1967 only - Oct lastSun 2:00 0 S
983 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
984 Zone America/Detroit -5:32:11 - LMT 1905
985 -6:00 - CST 1915 May 15 2:00
986 -5:00 - EST 1942
987 -5:00 US E%sT 1946
988 -5:00 Detroit E%sT 1973
989 -5:00 US E%sT 1975
990 -5:00 - EST 1975 Apr 27 2:00
991 -5:00 US E%sT
992 #
993 # Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
994 # switched from EST to CST/CDT in 1973.
995 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
996 Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
997 Rule Menominee 1946 only - Sep lastSun 2:00 0 S
998 Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
999 Rule Menominee 1966 only - Oct lastSun 2:00 0 S
1000 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1001 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
1002 -6:00 US C%sT 1946
1003 -6:00 Menominee C%sT 1969 Apr 27 2:00
1004 -5:00 - EST 1973 Apr 29 2:00
1005 -6:00 US C%sT
1006
1007 # Navassa
1008 # administered by the US Fish and Wildlife Service
1009 # claimed by US under the provisions of the 1856 Guano Islands Act
1010 # also claimed by Haiti
1011 # occupied 1857/1900 by the Navassa Phosphate Co
1012 # US lighthouse 1917/1996-09
1013 # currently uninhabited
1014 # see Mark Fineman, ``An Isle Rich in Guano and Discord'',
1015 # _Los Angeles Times_ (1998-11-10), A1, A10; it cites
1016 # Jimmy Skaggs, _The Great Guano Rush_ (1994).
1017
1018 ################################################################################
1019
1020
1021 # From Paul Eggert (2006-03-22):
1022 # A good source for time zone historical data outside the U.S. is
1023 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
1024 # San Diego: ACS Publications, Inc. (2003).
1025 #
1026 # Gwillim Law writes that a good source
1027 # for recent time zone data is the International Air Transport
1028 # Association's Standard Schedules Information Manual (IATA SSIM),
1029 # published semiannually. Law sent in several helpful summaries
1030 # of the IATA's data after 1990.
1031 #
1032 # Except where otherwise noted, Shanks & Pottenger is the source for
1033 # entries through 1990, and IATA SSIM is the source for entries afterwards.
1034 #
1035 # Other sources occasionally used include:
1036 #
1037 # Edward W. Whitman, World Time Differences,
1038 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
1039 # which I found in the UCLA library.
1040 #
1041 # <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf">
1042 # William Willett, The Waste of Daylight, 19th edition
1043 # </a> (1914-03)
1044 #
1045 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
1046 # <http://www.jstor.org/stable/1774359>.
1047 #
1048 # See the `europe' file for Greenland.
1049
1050 # Canada
1051
1052 # From Alain LaBont<e'> (1994-11-14):
1053 # I post here the time zone abbreviations standardized in Canada
1054 # for both English and French in the CAN/CSA-Z234.4-89 standard....
1055 #
1056 # UTC Standard time Daylight savings time
1057 # offset French English French English
1058 # -2:30 - - HAT NDT
1059 # -3 - - HAA ADT
1060 # -3:30 HNT NST - -
1061 # -4 HNA AST HAE EDT
1062 # -5 HNE EST HAC CDT
1063 # -6 HNC CST HAR MDT
1064 # -7 HNR MST HAP PDT
1065 # -8 HNP PST HAY YDT
1066 # -9 HNY YST - -
1067 #
1068 # HN: Heure Normale ST: Standard Time
1069 # HA: Heure Avanc<e'>e DT: Daylight saving Time
1070 #
1071 # A: de l'Atlantique Atlantic
1072 # C: du Centre Central
1073 # E: de l'Est Eastern
1074 # M: Mountain
1075 # N: Newfoundland
1076 # P: du Pacifique Pacific
1077 # R: des Rocheuses
1078 # T: de Terre-Neuve
1079 # Y: du Yukon Yukon
1080 #
1081 # From Paul Eggert (1994-11-22):
1082 # Alas, this sort of thing must be handled by localization software.
1083
1084 # Unless otherwise specified, the data for Canada are all from Shanks
1085 # & Pottenger.
1086
1087 # From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
1088 # 2007-03-01):
1089 # The British Columbia government announced yesterday that it will
1090 # adjust daylight savings next year to align with changes in the
1091 # U.S. and the rest of Canada....
1092 # http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
1093 # ...
1094 # Nova Scotia
1095 # Daylight saving time will be extended by four weeks starting in 2007....
1096 # http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf
1097 #
1098 # [For New Brunswick] the new legislation dictates that the time change is to
1099 # be done at 02:00 instead of 00:01.
1100 # http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
1101 # ...
1102 # Manitoba has traditionally changed the clock every fall at 03:00.
1103 # As of 2006, the transition is to take place one hour earlier at 02:00.
1104 # http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
1105 # ...
1106 # [Alberta, Ontario, Quebec] will follow US rules.
1107 # http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
1108 # http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
1109 # http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
1110 # ...
1111 # P.E.I. will follow US rules....
1112 # http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
1113 # ...
1114 # Province of Newfoundland and Labrador....
1115 # http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
1116 # ...
1117 # Yukon
1118 # http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
1119 # ...
1120 # N.W.T. will follow US rules. Whoever maintains the government web site
1121 # does not seem to believe in bookmarks. To see the news release, click the
1122 # following link and search for "Daylight Savings Time Change". Press the
1123 # "Daylight Savings Time Change" link; it will fire off a popup using
1124 # JavaScript.
1125 # http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
1126 # ...
1127 # Nunavut
1128 # An amendment to the Interpretation Act was registered on February 19/2007....
1129 # http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
1130
1131 # From Paul Eggert (2006-04-25):
1132 # H. David Matthews and Mary Vincent's map
1133 # <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp">
1134 # "It's about TIME", _Canadian Geographic_ (September-October 1998)
1135 # </a> contains detailed boundaries for regions observing nonstandard
1136 # time and daylight saving time arrangements in Canada circa 1998.
1137 #
1138 # INMS, the Institute for National Measurement Standards in Ottawa, has <a
1139 # href="http://inms-ienm.nrc-cnrc.gc.ca/en/time_services/daylight_saving_e.php">
1140 # information about standard and daylight saving time zones in Canada.
1141 # </a> (updated periodically).
1142 # Its unofficial information is often taken from Matthews and Vincent.
1143
1144 # From Paul Eggert (2006-06-27):
1145 # For now, assume all of DST-observing Canada will fall into line with the
1146 # new US DST rules,
1147
1148 # From Chris Walton (2011-12-01)
1149 # In the first of Tammy Hardwick's articles
1150 # <a href="http://www.ilovecreston.com/?p=articles&t=spec&ar=260">
1151 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1152 # </a>
1153 # she quotes the Friday November 1/1918 edition of the Creston Review.
1154 # The quote includes these two statements:
1155 # 'Sunday the CPR went back to the old system of time...'
1156 # '... The daylight saving scheme was dropped all over Canada at the same time,'
1157 # These statements refer to a transition from daylight time to standard time
1158 # that occurred nationally on Sunday October 27/1918. This transition was
1159 # also documented in the Saturday October 26/1918 edition of the Toronto Star.
1160
1161 # In light of that evidence, we alter the date from the earlier believed
1162 # Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day
1163 # than Thursday) in all Canadian rulesets.
1164
1165 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1166 Rule Canada 1918 only - Apr 14 2:00 1:00 D
1167 Rule Canada 1918 only - Oct 27 2:00 0 S
1168 Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
1169 Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
1170 Rule Canada 1945 only - Sep 30 2:00 0 S
1171 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
1172 Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
1173 Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D
1174 Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D
1175 Rule Canada 2007 max - Nov Sun>=1 2:00 0 S
1176
1177
1178 # Newfoundland and Labrador
1179
1180 # From Paul Eggert (2000-10-02):
1181 # Matthews and Vincent (1998) write that Labrador should use NST/NDT,
1182 # but the only part of Labrador that follows the rules is the
1183 # southeast corner, including Port Hope Simpson and Mary's Harbour,
1184 # but excluding, say, Black Tickle.
1185
1186 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1187 Rule StJohns 1917 only - Apr 8 2:00 1:00 D
1188 Rule StJohns 1917 only - Sep 17 2:00 0 S
1189 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
1190 Rule StJohns 1919 only - May 5 23:00 1:00 D
1191 Rule StJohns 1919 only - Aug 12 23:00 0 S
1192 # For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
1193 Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
1194 Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
1195 # For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
1196 # Pottenger.
1197 Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
1198 Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
1199 # Whitman gives the following transitions:
1200 # 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
1201 # but go with Shanks & Pottenger and assume they used Canadian rules.
1202 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
1203 # Apr 30 - Sep 24; go with Shanks & Pottenger.
1204 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
1205 Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
1206 Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
1207 Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
1208 Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
1209 # From Paul Eggert (2000-10-02):
1210 # INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
1211 # at 00:01 local time. For now, assume it started in 1987.
1212
1213 # From Michael Pelley (2011-09-12):
1214 # We received today, Monday, September 12, 2011, notification that the
1215 # changes to the Newfoundland Standard Time Act have been proclaimed.
1216 # The change in the Act stipulates that the change from Daylight Savings
1217 # Time to Standard Time and from Standard Time to Daylight Savings Time
1218 # now occurs at 2:00AM.
1219 # ...
1220 # <a href="http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm">
1221 # http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm
1222 # </a>
1223 # ...
1224 # MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery
1225 # Office of the Chief Information Officer
1226 # Executive Council
1227 # Government of Newfoundland & Labrador
1228
1229 Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
1230 Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S
1231 Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
1232 Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D
1233 Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D
1234 Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S
1235 #
1236 # St John's has an apostrophe, but Posix file names can't have apostrophes.
1237 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1238 Zone America/St_Johns -3:30:52 - LMT 1884
1239 -3:30:52 StJohns N%sT 1918
1240 -3:30:52 Canada N%sT 1919
1241 -3:30:52 StJohns N%sT 1935 Mar 30
1242 -3:30 StJohns N%sT 1942 May 11
1243 -3:30 Canada N%sT 1946
1244 -3:30 StJohns N%sT 2011 Nov
1245 -3:30 Canada N%sT
1246
1247 # most of east Labrador
1248
1249 # The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
1250 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1251 Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
1252 -3:30:52 - NST 1918
1253 -3:30:52 Canada N%sT 1919
1254 -3:30:52 - NST 1935 Mar 30
1255 -3:30 - NST 1936
1256 -3:30 StJohns N%sT 1942 May 11
1257 -3:30 Canada N%sT 1946
1258 -3:30 StJohns N%sT 1966 Mar 15 2:00
1259 -4:00 StJohns A%sT 2011 Nov
1260 -4:00 Canada A%sT
1261
1262
1263 # west Labrador, Nova Scotia, Prince Edward I
1264
1265 # From Paul Eggert (2006-03-22):
1266 # Shanks & Pottenger write that since 1970 most of this region has been like
1267 # Halifax. Many locales did not observe peacetime DST until 1972;
1268 # Glace Bay, NS is the largest that we know of.
1269 # Shanks & Pottenger also write that Liverpool, NS was the only town
1270 # in Canada to observe DST in 1971 but not 1970; for now we'll assume
1271 # this is a typo.
1272
1273 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1274 Rule Halifax 1916 only - Apr 1 0:00 1:00 D
1275 Rule Halifax 1916 only - Oct 1 0:00 0 S
1276 Rule Halifax 1920 only - May 9 0:00 1:00 D
1277 Rule Halifax 1920 only - Aug 29 0:00 0 S
1278 Rule Halifax 1921 only - May 6 0:00 1:00 D
1279 Rule Halifax 1921 1922 - Sep 5 0:00 0 S
1280 Rule Halifax 1922 only - Apr 30 0:00 1:00 D
1281 Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
1282 Rule Halifax 1923 only - Sep 4 0:00 0 S
1283 Rule Halifax 1924 only - Sep 15 0:00 0 S
1284 Rule Halifax 1925 only - Sep 28 0:00 0 S
1285 Rule Halifax 1926 only - May 16 0:00 1:00 D
1286 Rule Halifax 1926 only - Sep 13 0:00 0 S
1287 Rule Halifax 1927 only - May 1 0:00 1:00 D
1288 Rule Halifax 1927 only - Sep 26 0:00 0 S
1289 Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
1290 Rule Halifax 1928 only - Sep 9 0:00 0 S
1291 Rule Halifax 1929 only - Sep 3 0:00 0 S
1292 Rule Halifax 1930 only - Sep 15 0:00 0 S
1293 Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
1294 Rule Halifax 1932 only - May 1 0:00 1:00 D
1295 Rule Halifax 1933 only - Apr 30 0:00 1:00 D
1296 Rule Halifax 1933 only - Oct 2 0:00 0 S
1297 Rule Halifax 1934 only - May 20 0:00 1:00 D
1298 Rule Halifax 1934 only - Sep 16 0:00 0 S
1299 Rule Halifax 1935 only - Jun 2 0:00 1:00 D
1300 Rule Halifax 1935 only - Sep 30 0:00 0 S
1301 Rule Halifax 1936 only - Jun 1 0:00 1:00 D
1302 Rule Halifax 1936 only - Sep 14 0:00 0 S
1303 Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
1304 Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
1305 Rule Halifax 1939 only - May 28 0:00 1:00 D
1306 Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
1307 Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D
1308 Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S
1309 Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D
1310 Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S
1311 Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D
1312 Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S
1313 Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D
1314 Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S
1315 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1316 Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
1317 -4:00 Halifax A%sT 1918
1318 -4:00 Canada A%sT 1919
1319 -4:00 Halifax A%sT 1942 Feb 9 2:00s
1320 -4:00 Canada A%sT 1946
1321 -4:00 Halifax A%sT 1974
1322 -4:00 Canada A%sT
1323 Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
1324 -4:00 Canada A%sT 1953
1325 -4:00 Halifax A%sT 1954
1326 -4:00 - AST 1972
1327 -4:00 Halifax A%sT 1974
1328 -4:00 Canada A%sT
1329
1330 # New Brunswick
1331
1332 # From Paul Eggert (2007-01-31):
1333 # The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf>
1334 # says they changed at 00:01 through 2006, and
1335 # <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it
1336 # clear that this was the case since at least 1993.
1337 # For now, assume it started in 1993.
1338
1339 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1340 Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D
1341 Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S
1342 Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D
1343 Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S
1344 Rule Moncton 1939 only - May 27 1:00 1:00 D
1345 Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S
1346 Rule Moncton 1940 only - May 19 1:00 1:00 D
1347 Rule Moncton 1941 only - May 4 1:00 1:00 D
1348 Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D
1349 Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S
1350 Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S
1351 Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D
1352 Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S
1353 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1354 Zone America/Moncton -4:19:08 - LMT 1883 Dec 9
1355 -5:00 - EST 1902 Jun 15
1356 -4:00 Canada A%sT 1933
1357 -4:00 Moncton A%sT 1942
1358 -4:00 Canada A%sT 1946
1359 -4:00 Moncton A%sT 1973
1360 -4:00 Canada A%sT 1993
1361 -4:00 Moncton A%sT 2007
1362 -4:00 Canada A%sT
1363
1364 # Quebec
1365
1366 # From Paul Eggert (2006-07-09):
1367 # Shanks & Pottenger write that since 1970 most of Quebec has been
1368 # like Montreal.
1369
1370 # From Paul Eggert (2006-06-27):
1371 # Matthews and Vincent (1998) also write that Quebec east of the -63
1372 # meridian is supposed to observe AST, but residents as far east as
1373 # Natashquan use EST/EDT, and residents east of Natashquan use AST.
1374 # In "Official time in Quebec" the Quebec department of justice writes in
1375 # http://www.justice.gouv.qc.ca/english/publications/generale/temps-regl-1-a.htm
1376 # that "The residents of the Municipality of the
1377 # Cote-Nord-du-Golfe-Saint-Laurent and the municipalities of Saint-Augustin,
1378 # Bonne-Esperance and Blanc-Sablon apply the Official Time Act as it is
1379 # written and use Atlantic standard time all year round. The same applies to
1380 # the residents of the Native facilities along the lower North Shore."
1381 # <http://www.assnat.qc.ca/eng/37legislature2/Projets-loi/Publics/06-a002.htm>
1382 # says this common practice was codified into law as of 2007.
1383 # For lack of better info, guess this practice began around 1970, contra to
1384 # Shanks & Pottenger who have this region observing AST/ADT.
1385
1386 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1387 Rule Mont 1917 only - Mar 25 2:00 1:00 D
1388 Rule Mont 1917 only - Apr 24 0:00 0 S
1389 Rule Mont 1919 only - Mar 31 2:30 1:00 D
1390 Rule Mont 1919 only - Oct 25 2:30 0 S
1391 Rule Mont 1920 only - May 2 2:30 1:00 D
1392 Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
1393 Rule Mont 1921 only - May 1 2:00 1:00 D
1394 Rule Mont 1922 only - Apr 30 2:00 1:00 D
1395 Rule Mont 1924 only - May 17 2:00 1:00 D
1396 Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
1397 Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
1398 # The 1927-to-1937 rules can be expressed more simply as
1399 # Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D
1400 # Rule Mont 1927 1937 - Sep lastSat 24:00 0 S
1401 # The rules below avoid use of 24:00
1402 # (which pre-1998 versions of zic cannot handle).
1403 Rule Mont 1927 only - May 1 0:00 1:00 D
1404 Rule Mont 1927 1932 - Sep lastSun 0:00 0 S
1405 Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D
1406 Rule Mont 1932 only - May 1 0:00 1:00 D
1407 Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D
1408 Rule Mont 1933 only - Oct 1 0:00 0 S
1409 Rule Mont 1934 1939 - Sep lastSun 0:00 0 S
1410 Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D
1411 Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
1412 Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
1413 Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
1414 Rule Mont 1957 1973 - Oct lastSun 2:00 0 S
1415
1416 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1417 Zone America/Blanc-Sablon -3:48:28 - LMT 1884
1418 -4:00 Canada A%sT 1970
1419 -4:00 - AST
1420 Zone America/Montreal -4:54:16 - LMT 1884
1421 -5:00 Mont E%sT 1918
1422 -5:00 Canada E%sT 1919
1423 -5:00 Mont E%sT 1942 Feb 9 2:00s
1424 -5:00 Canada E%sT 1946
1425 -5:00 Mont E%sT 1974
1426 -5:00 Canada E%sT
1427
1428
1429 # Ontario
1430
1431 # From Paul Eggert (2006-07-09):
1432 # Shanks & Pottenger write that since 1970 most of Ontario has been like
1433 # Toronto.
1434 # Thunder Bay skipped DST in 1973.
1435 # Many smaller locales did not observe peacetime DST until 1974;
1436 # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1437 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
1438
1439 # From Mark Brader (2003-07-26):
1440 # [According to the Toronto Star] Orillia, Ontario, adopted DST
1441 # effective Saturday, 1912-06-22, 22:00; the article mentions that
1442 # Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
1443 # have already done so. In Orillia DST was to run until Saturday,
1444 # 1912-08-31 (no time mentioned), but it was met with considerable
1445 # hostility from certain segments of the public, and was revoked after
1446 # only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but
1447 # presumably that should be -07-06. (1912-06-19, -07-12; also letters
1448 # earlier in June).
1449 #
1450 # Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
1451
1452 # From Paul Eggert (1997-10-17):
1453 # Mark Brader writes that an article in the 1997-10-14 Toronto Star
1454 # says that Atikokan, Ontario currently does not observe DST,
1455 # but will vote on 11-10 whether to use EST/EDT.
1456 # He also writes that the
1457 # <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
1458 # Ontario Time Act (1990, Chapter T.9)
1459 # </a>
1460 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
1461 # Officially Atikokan is therefore on CST/CDT, and most likely this report
1462 # concerns a non-official time observed as a matter of local practice.
1463 #
1464 # From Paul Eggert (2000-10-02):
1465 # Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
1466 # New Osnaburgh observe CST all year, that Big Trout Lake observes
1467 # CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
1468 # violation of the official Ontario rules.
1469 #
1470 # From Paul Eggert (2006-07-09):
1471 # Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
1472 # 2005-07-21 Chronicle-Journal, which said:
1473 #
1474 # The clocks in Atikokan stay set on standard time year-round.
1475 # This means they spend about half the time on central time and
1476 # the other half on eastern time.
1477 #
1478 # For the most part, the system works, Mayor Dennis Brown said.
1479 #
1480 # "The majority of businesses in Atikokan deal more with Eastern
1481 # Canada, but there are some that deal with Western Canada," he
1482 # said. "I don't see any changes happening here."
1483 #
1484 # Walton also writes "Supposedly Pickle Lake and Mishkeegogamang
1485 # [New Osnaburgh] follow the same practice."
1486
1487 # From Garry McKinnon (2006-07-14) via Chris Walton:
1488 # I chatted with a member of my board who has an outstanding memory
1489 # and a long history in Atikokan (and in the telecom industry) and he
1490 # can say for certain that Atikokan has been practicing the current
1491 # time keeping since 1952, at least.
1492
1493 # From Paul Eggert (2006-07-17):
1494 # Shanks & Pottenger say that Atikokan has agreed with Rainy River
1495 # ever since standard time was introduced, but the information from
1496 # McKinnon sounds more authoritative. For now, assume that Atikokan
1497 # switched to EST immediately after WWII era daylight saving time
1498 # ended. This matches the old (less-populous) America/Coral_Harbour
1499 # entry since our cutoff date of 1970, so we can move
1500 # America/Coral_Harbour to the 'backward' file.
1501
1502 # From Mark Brader (2010-03-06):
1503 #
1504 # Currently the database has:
1505 #
1506 # # Ontario
1507 #
1508 # # From Paul Eggert (2006-07-09):
1509 # # Shanks & Pottenger write that since 1970 most of Ontario has been like
1510 # # Toronto.
1511 # # Thunder Bay skipped DST in 1973.
1512 # # Many smaller locales did not observe peacetime DST until 1974;
1513 # # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1514 #
1515 # In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom
1516 # right corner of page 1, it says that Toronto will return to standard
1517 # time at 2 am Sunday morning (which agrees with the database), and that:
1518 #
1519 # The one-hour setback will go into effect throughout most of Ontario,
1520 # except in areas like Windsor which remains on standard time all year.
1521 #
1522 # Windsor is, of course, a lot larger than Nipigon.
1523 #
1524 # I only came across this incidentally. I don't know if Windsor began
1525 # observing DST when Detroit did, or in 1974, or on some other date.
1526 #
1527 # By the way, the article continues by noting that:
1528 #
1529 # Some cities in the United States have pushed the deadline back
1530 # three weeks and will change over from daylight saving in October.
1531
1532 # From Arthur David Olson (2010-07-17):
1533 #
1534 # "Standard Time and Time Zones in Canada" appeared in
1535 # The Journal of The Royal Astronomical Society of Canada,
1536 # volume 26, number 2 (February 1932) and, as of 2010-07-17,
1537 # was available at
1538 # <a href="http://adsabs.harvard.edu/full/1932JRASC..26...49S">
1539 # http://adsabs.harvard.edu/full/1932JRASC..26...49S
1540 # </a>
1541 #
1542 # It includes the text below (starting on page 57):
1543 #
1544 # A list of the places in Canada using daylight saving time would
1545 # require yearly revision. From information kindly furnished by
1546 # the provincial governments and by the postmasters in many cities
1547 # and towns, it is found that the following places used daylight sav-
1548 # ing in 1930. The information for the province of Quebec is definite,
1549 # for the other provinces only approximate:
1550 #
1551 # Province Daylight saving time used
1552 # Prince Edward Island Not used.
1553 # Nova Scotia In Halifax only.
1554 # New Brunswick In St. John only.
1555 # Quebec In the following places:
1556 # Montreal Lachine
1557 # Quebec Mont-Royal
1558 # Levis Iberville
1559 # St. Lambert Cap de la Madeleine
1560 # Verdun Loretteville
1561 # Westmount Richmond
1562 # Outremont St. Jerome
1563 # Longueuil Greenfield Park
1564 # Arvida Waterloo
1565 # Chambly-Canton Beaulieu
1566 # Melbourne La Tuque
1567 # St. Theophile Buckingham
1568 # Ontario Used generally in the cities and towns along
1569 # the southerly part of the province. Not
1570 # used in the northwesterlhy part.
1571 # Manitoba Not used.
1572 # Saskatchewan In Regina only.
1573 # Alberta Not used.
1574 # British Columbia Not used.
1575 #
1576 # With some exceptions, the use of daylight saving may be said to be limited
1577 # to those cities and towns lying between Quebec city and Windsor, Ont.
1578
1579 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1580 Rule Toronto 1919 only - Mar 30 23:30 1:00 D
1581 Rule Toronto 1919 only - Oct 26 0:00 0 S
1582 Rule Toronto 1920 only - May 2 2:00 1:00 D
1583 Rule Toronto 1920 only - Sep 26 0:00 0 S
1584 Rule Toronto 1921 only - May 15 2:00 1:00 D
1585 Rule Toronto 1921 only - Sep 15 2:00 0 S
1586 Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
1587 # Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
1588 # was meant.
1589 Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
1590 Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
1591 # The 1927-to-1939 rules can be expressed more simply as
1592 # Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S
1593 # Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D
1594 # Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D
1595 # Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S
1596 # The rules below avoid use of Sun>=25
1597 # (which pre-2004 versions of zic cannot handle).
1598 Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S
1599 Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D
1600 Rule Toronto 1932 only - May 1 2:00 1:00 D
1601 Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D
1602 Rule Toronto 1933 only - Oct 1 2:00 0 S
1603 Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S
1604 Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S
1605 Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D
1606 Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D
1607 Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S
1608 Rule Toronto 1949 only - Nov lastSun 0:00 0 S
1609 Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D
1610 Rule Toronto 1950 only - Nov lastSun 2:00 0 S
1611 Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S
1612 # Shanks & Pottenger say Toronto ended DST a week early in 1971,
1613 # namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this
1614 # is wrong, and that he had confirmed it by checking the 1971-10-30
1615 # Toronto Star, which said that DST was ending 1971-10-31 as usual.
1616 Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S
1617
1618 # From Paul Eggert (2003-07-27):
1619 # Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
1620 # Port Arthur, Ontario, the principle of the Bill has been in
1621 # operation for the past three years, and in the City of Moose Jaw,
1622 # Saskatchewan, for one year."
1623
1624 # From David Bryan via Tory Tronrud, Director/Curator,
1625 # Thunder Bay Museum (2003-11-12):
1626 # There is some suggestion, however, that, by-law or not, daylight
1627 # savings time was being practiced in Fort William and Port Arthur
1628 # before 1909.... [I]n 1910, the line between the Eastern and Central
1629 # Time Zones was permanently moved about two hundred miles west to
1630 # include the Thunder Bay area.... When Canada adopted daylight
1631 # savings time in 1916, Fort William and Port Arthur, having done so
1632 # already, did not change their clocks.... During the Second World
1633 # War,... [t]he cities agreed to implement DST during the summer
1634 # months for the remainder of the war years.
1635
1636 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1637 Zone America/Toronto -5:17:32 - LMT 1895
1638 -5:00 Canada E%sT 1919
1639 -5:00 Toronto E%sT 1942 Feb 9 2:00s
1640 -5:00 Canada E%sT 1946
1641 -5:00 Toronto E%sT 1974
1642 -5:00 Canada E%sT
1643 Zone America/Thunder_Bay -5:57:00 - LMT 1895
1644 -6:00 - CST 1910
1645 -5:00 - EST 1942
1646 -5:00 Canada E%sT 1970
1647 -5:00 Mont E%sT 1973
1648 -5:00 - EST 1974
1649 -5:00 Canada E%sT
1650 Zone America/Nipigon -5:53:04 - LMT 1895
1651 -5:00 Canada E%sT 1940 Sep 29
1652 -5:00 1:00 EDT 1942 Feb 9 2:00s
1653 -5:00 Canada E%sT
1654 Zone America/Rainy_River -6:18:16 - LMT 1895
1655 -6:00 Canada C%sT 1940 Sep 29
1656 -6:00 1:00 CDT 1942 Feb 9 2:00s
1657 -6:00 Canada C%sT
1658 Zone America/Atikokan -6:06:28 - LMT 1895
1659 -6:00 Canada C%sT 1940 Sep 29
1660 -6:00 1:00 CDT 1942 Feb 9 2:00s
1661 -6:00 Canada C%sT 1945 Sep 30 2:00
1662 -5:00 - EST
1663
1664
1665 # Manitoba
1666
1667 # From Rob Douglas (2006-04-06):
1668 # the old Manitoba Time Act - as amended by Bill 2, assented to
1669 # March 27, 1987 ... said ...
1670 # "between two o'clock Central Standard Time in the morning of
1671 # the first Sunday of April of each year and two o'clock Central
1672 # Standard Time in the morning of the last Sunday of October next
1673 # following, one hour in advance of Central Standard Time."...
1674 # I believe that the English legislation [of the old time act] had =
1675 # been assented to (March 22, 1967)....
1676 # Also, as far as I can tell, there was no order-in-council varying
1677 # the time of Daylight Saving Time for 2005 and so the provisions of
1678 # the 1987 version would apply - the changeover was at 2:00 Central
1679 # Standard Time (i.e. not until 3:00 Central Daylight Time).
1680
1681 # From Paul Eggert (2006-04-10):
1682 # Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
1683 # starting 1966. Since 02:00s is clearly correct for 1967 on, assume
1684 # it was also 02:00s in 1966.
1685
1686 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1687 Rule Winn 1916 only - Apr 23 0:00 1:00 D
1688 Rule Winn 1916 only - Sep 17 0:00 0 S
1689 Rule Winn 1918 only - Apr 14 2:00 1:00 D
1690 Rule Winn 1918 only - Oct 27 2:00 0 S
1691 Rule Winn 1937 only - May 16 2:00 1:00 D
1692 Rule Winn 1937 only - Sep 26 2:00 0 S
1693 Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
1694 Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
1695 Rule Winn 1945 only - Sep lastSun 2:00 0 S
1696 Rule Winn 1946 only - May 12 2:00 1:00 D
1697 Rule Winn 1946 only - Oct 13 2:00 0 S
1698 Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
1699 Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
1700 Rule Winn 1950 only - May 1 2:00 1:00 D
1701 Rule Winn 1950 only - Sep 30 2:00 0 S
1702 Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
1703 Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
1704 Rule Winn 1959 only - Oct lastSun 2:00 0 S
1705 Rule Winn 1960 only - Sep lastSun 2:00 0 S
1706 Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
1707 Rule Winn 1963 only - Sep 22 2:00 0 S
1708 Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D
1709 Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S
1710 Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D
1711 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1712 Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
1713 -6:00 Winn C%sT 2006
1714 -6:00 Canada C%sT
1715
1716
1717 # Saskatchewan
1718
1719 # From Mark Brader (2003-07-26):
1720 # The first actual adoption of DST in Canada was at the municipal
1721 # level. As the [Toronto] Star put it (1912-06-07), "While people
1722 # elsewhere have long been talking of legislation to save daylight,
1723 # the city of Moose Jaw [Saskatchewan] has acted on its own hook."
1724 # DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
1725 # presumably late evening, as below), and would run until "the end of
1726 # the summer". The discrepancy between municipal time and railroad
1727 # time was noted.
1728
1729 # From Paul Eggert (2003-07-27):
1730 # Willett (1914-03) notes that DST "has been in operation ... in the
1731 # City of Moose Jaw, Saskatchewan, for one year."
1732
1733 # From Paul Eggert (2006-03-22):
1734 # Shanks & Pottenger say that since 1970 this region has mostly been as Regina.
1735 # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
1736 # Other western towns (e.g. Lloydminster) are like Edmonton.
1737 # Matthews and Vincent (1998) write that Denare Beach and Creighton
1738 # are like Winnipeg, in violation of Saskatchewan law.
1739
1740 # From W. Jones (1992-11-06):
1741 # The. . .below is based on information I got from our law library, the
1742 # provincial archives, and the provincial Community Services department.
1743 # A precise history would require digging through newspaper archives, and
1744 # since you didn't say what you wanted, I didn't bother.
1745 #
1746 # Saskatchewan is split by a time zone meridian (105W) and over the years
1747 # the boundary became pretty ragged as communities near it reevaluated
1748 # their affiliations in one direction or the other. In 1965 a provincial
1749 # referendum favoured legislating common time practices.
1750 #
1751 # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
1752 # Saskatchewan 1978) was proclaimed, and established that the eastern
1753 # part of Saskatchewan would use CST year round, that districts in
1754 # northwest Saskatchewan would by default follow CST but could opt to
1755 # follow Mountain Time rules (thus 1 hour difference in the winter and
1756 # zero in the summer), and that districts in southwest Saskatchewan would
1757 # by default follow MT but could opt to follow CST.
1758 #
1759 # It took a few years for the dust to settle (I know one story of a town
1760 # on one time zone having its school in another, such that a mom had to
1761 # serve her family lunch in two shifts), but presently it seems that only
1762 # a few towns on the border with Alberta (e.g. Lloydminster) follow MT
1763 # rules any more; all other districts appear to have used CST year round
1764 # since sometime in the 1960s.
1765
1766 # From Chris Walton (2006-06-26):
1767 # The Saskatchewan time act which was last updated in 1996 is about 30 pages
1768 # long and rather painful to read.
1769 # http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf
1770
1771 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1772 Rule Regina 1918 only - Apr 14 2:00 1:00 D
1773 Rule Regina 1918 only - Oct 27 2:00 0 S
1774 Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
1775 Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
1776 Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
1777 Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
1778 Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
1779 Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
1780 Rule Regina 1942 only - Feb 9 2:00 1:00 W # War
1781 Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace
1782 Rule Regina 1945 only - Sep lastSun 2:00 0 S
1783 Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
1784 Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
1785 Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D
1786 Rule Regina 1947 1957 - Sep lastSun 2:00 0 S
1787 Rule Regina 1959 only - Apr lastSun 2:00 1:00 D
1788 Rule Regina 1959 only - Oct lastSun 2:00 0 S
1789 #
1790 Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
1791 Rule Swift 1957 only - Oct lastSun 2:00 0 S
1792 Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
1793 Rule Swift 1959 only - Oct lastSun 2:00 0 S
1794 Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
1795 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1796 Zone America/Regina -6:58:36 - LMT 1905 Sep
1797 -7:00 Regina M%sT 1960 Apr lastSun 2:00
1798 -6:00 - CST
1799 Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
1800 -7:00 Canada M%sT 1946 Apr lastSun 2:00
1801 -7:00 Regina M%sT 1950
1802 -7:00 Swift M%sT 1972 Apr lastSun 2:00
1803 -6:00 - CST
1804
1805
1806 # Alberta
1807
1808 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1809 Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
1810 Rule Edm 1918 only - Oct 27 2:00 0 S
1811 Rule Edm 1919 only - May 27 2:00 0 S
1812 Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
1813 Rule Edm 1920 only - Oct lastSun 2:00 0 S
1814 Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
1815 Rule Edm 1942 only - Feb 9 2:00 1:00 W # War
1816 Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace
1817 Rule Edm 1945 only - Sep lastSun 2:00 0 S
1818 Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
1819 Rule Edm 1947 only - Sep lastSun 2:00 0 S
1820 Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
1821 Rule Edm 1967 only - Oct lastSun 2:00 0 S
1822 Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
1823 Rule Edm 1969 only - Oct lastSun 2:00 0 S
1824 Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
1825 Rule Edm 1972 2006 - Oct lastSun 2:00 0 S
1826 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1827 Zone America/Edmonton -7:33:52 - LMT 1906 Sep
1828 -7:00 Edm M%sT 1987
1829 -7:00 Canada M%sT
1830
1831
1832 # British Columbia
1833
1834 # From Paul Eggert (2006-03-22):
1835 # Shanks & Pottenger write that since 1970 most of this region has
1836 # been like Vancouver.
1837 # Dawson Creek uses MST. Much of east BC is like Edmonton.
1838 # Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1839
1840 # It seems though that (re: Creston) is not entirely correct:
1841
1842 # From Chris Walton (2011-12-01):
1843 # There are two areas within the Canadian province of British Columbia
1844 # that do not currently observe daylight saving:
1845 # a) The Creston Valley (includes the town of Creston and surrounding area)
1846 # b) The eastern half of the Peace River Regional District
1847 # (includes the cities of Dawson Creek and Fort St. John)
1848
1849 # Earlier this year I stumbled across a detailed article about the time
1850 # keeping history of Creston; it was written by Tammy Hardwick who is the
1851 # manager of the Creston & District Museum. The article was written in May 2009.
1852 # <a href="http://www.ilovecreston.com/?p=articles&t=spec&ar=260">
1853 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1854 # </a>
1855 # According to the article, Creston has not changed its clocks since June 1918.
1856 # i.e. Creston has been stuck on UTC-7 for 93 years.
1857 # Dawson Creek, on the other hand, changed its clocks as recently as April 1972.
1858
1859 # Unfortunately the exact date for the time change in June 1918 remains
1860 # unknown and will be difficult to ascertain. I e-mailed Tammy a few months
1861 # ago to ask if Sunday June 2 was a reasonable guess. She said it was just
1862 # as plausible as any other date (in June). She also said that after writing the
1863 # article she had discovered another time change in 1916; this is the subject
1864 # of another article which she wrote in October 2010.
1865 # <a href="http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56">
1866 # http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56
1867 # </a>
1868
1869 # Here is a summary of the three clock change events in Creston's history:
1870 # 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7)
1871 # Exact date unknown
1872 # 2. Oct 1916: switch to Pacific Standard Time (GMT-8)
1873 # Exact date in October unknown; Sunday October 1 is a reasonable guess.
1874 # 3. June 1918: switch to Pacific Daylight Time (GMT-7)
1875 # Exact date in June unknown; Sunday June 2 is a reasonable guess.
1876 # note#1:
1877 # On Oct 27/1918 when daylight saving ended in the rest of Canada,
1878 # Creston did not change its clocks.
1879 # note#2:
1880 # During WWII when the Federal Government legislated a mandatory clock change,
1881 # Creston did not oblige.
1882 # note#3:
1883 # There is no guarantee that Creston will remain on Mountain Standard Time
1884 # (UTC-7) forever.
1885 # The subject was debated at least once this year by the town Council.
1886 # <a href="http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html">
1887 # http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html
1888 # </a>
1889
1890 # During a period WWII, summer time (Daylight saying) was mandatory in Canada.
1891 # In Creston, that was handled by shifting the area to PST (-8:00) then applying
1892 # summer time to cause the offset to be -7:00, the same as it had been before
1893 # the change. It can be argued that the timezone abbreviation during this
1894 # period should be PDT rather than MST, but that doesn't seem important enough
1895 # (to anyone) to further complicate the rules.
1896
1897 # The transition dates (and times) are guesses.
1898
1899 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1900 Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1901 Rule Vanc 1918 only - Oct 27 2:00 0 S
1902 Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
1903 Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
1904 Rule Vanc 1945 only - Sep 30 2:00 0 S
1905 Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1906 Rule Vanc 1946 only - Oct 13 2:00 0 S
1907 Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1908 Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S
1909 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1910 Zone America/Vancouver -8:12:28 - LMT 1884
1911 -8:00 Vanc P%sT 1987
1912 -8:00 Canada P%sT
1913 Zone America/Dawson_Creek -8:00:56 - LMT 1884
1914 -8:00 Canada P%sT 1947
1915 -8:00 Vanc P%sT 1972 Aug 30 2:00
1916 -7:00 - MST
1917 Zone America/Creston -7:46:04 - LMT 1884
1918 -7:00 - MST 1916 Oct 1
1919 -8:00 - PST 1918 Jun 2
1920 -7:00 - MST
1921
1922 # Northwest Territories, Nunavut, Yukon
1923
1924 # From Paul Eggert (2006-03-22):
1925 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1926 # Mathew Englander (1996-10-07) gives the following refs:
1927 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1928 # c. 7 defines Yukon standard time as UTC-9. This is still valid;
1929 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1930 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1931 # * O.I.C. 1980/02 established DST.
1932 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1933 # Shanks & Pottenger say Yukon's 1973-10-28 switch was at 2:00; go
1934 # with Englander.
1935 # From Chris Walton (2006-06-26):
1936 # Here is a link to the old daylight saving portion of the interpretation
1937 # act which was last updated in 1987:
1938 # http://www.gov.yk.ca/legislation/regs/oic1987_056.pdf
1939
1940 # From Rives McDow (1999-09-04):
1941 # Nunavut ... moved ... to incorporate the whole territory into one time zone.
1942 # <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
1943 # Nunavut moves to single time zone Oct. 31
1944 # </a>
1945 #
1946 # From Antoine Leca (1999-09-06):
1947 # We then need to create a new timezone for the Kitikmeot region of Nunavut
1948 # to differentiate it from the Yellowknife region.
1949
1950 # From Paul Eggert (1999-09-20):
1951 # <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
1952 # Basic Facts: The New Territory
1953 # </a> (1999) reports that Pangnirtung operates on eastern time,
1954 # and that Coral Harbour does not observe DST. We don't know when
1955 # Pangnirtung switched to eastern time; we'll guess 1995.
1956
1957 # From Rives McDow (1999-11-08):
1958 # On October 31, when the rest of Nunavut went to Central time,
1959 # Pangnirtung wobbled. Here is the result of their wobble:
1960 #
1961 # The following businesses and organizations in Pangnirtung use Central Time:
1962 #
1963 # First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
1964 # Eastern Arctic National Parks, A & D Specialist
1965 #
1966 # The following businesses and organizations in Pangnirtung use Eastern Time:
1967 #
1968 # Hamlet office, All other businesses, Both schools, Airport operator
1969 #
1970 # This has made for an interesting situation there, which warranted the news.
1971 # No one there that I spoke with seems concerned, or has plans to
1972 # change the local methods of keeping time, as it evidently does not
1973 # really interfere with any activities or make things difficult locally.
1974 # They plan to celebrate New Year's turn-over twice, one hour apart,
1975 # so it appears that the situation will last at least that long.
1976 # The Nunavut Intergovernmental Affairs hopes that they will "come to
1977 # their senses", but the locals evidently don't see any problem with
1978 # the current state of affairs.
1979
1980 # From Michaela Rodrigue, writing in the
1981 # <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html">
1982 # Nunatsiaq News (1999-11-19)</a>:
1983 # Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
1984 # central - or Nunavut time - for government offices, and eastern time
1985 # for municipal offices and schools.... Igloolik [was similar but then]
1986 # made the switch to central time on Saturday, Nov. 6.
1987
1988 # From Paul Eggert (2000-10-02):
1989 # Matthews and Vincent (1998) say the following, but we lack histories
1990 # for these potential new Zones.
1991 #
1992 # The Canadian Forces station at Alert uses Eastern Time while the
1993 # handful of residents at the Eureka weather station [in the Central
1994 # zone] skip daylight savings. Baffin Island, which is crossed by the
1995 # Central, Eastern and Atlantic Time zones only uses Eastern Time.
1996 # Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
1997 # Central Time and Southampton Island [in the Central zone] is not
1998 # required to use daylight savings.
1999
2000 # From
2001 # <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html">
2002 # Nunavut now has two time zones
2003 # </a> (2000-11-10):
2004 # The Nunavut government would allow its employees in Kugluktuk and
2005 # Cambridge Bay to operate on central time year-round, putting them
2006 # one hour behind the rest of Nunavut for six months during the winter.
2007 # At the end of October the two communities had rebelled against
2008 # Nunavut's unified time zone, refusing to shift to eastern time with
2009 # the rest of the territory for the winter. Cambridge Bay remained on
2010 # central time, while Kugluktuk, even farther west, reverted to
2011 # mountain time, which they had used before the advent of Nunavut's
2012 # unified time zone in 1999.
2013 #
2014 # From Rives McDow (2001-01-20), quoting the Nunavut government:
2015 # The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
2016
2017 # From Paul Eggert (2000-12-04):
2018 # Let's just keep track of the official times for now.
2019
2020 # From Rives McDow (2001-03-07):
2021 # The premier of Nunavut has issued a ministerial statement advising
2022 # that effective 2001-04-01, the territory of Nunavut will revert
2023 # back to three time zones (mountain, central, and eastern). Of the
2024 # cities in Nunavut, Coral Harbor is the only one that I know of that
2025 # has said it will not observe dst, staying on EST year round. I'm
2026 # checking for more info, and will get back to you if I come up with
2027 # more.
2028 # [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
2029
2030 # From Gwillim Law (2005-05-21):
2031 # According to maps at
2032 # http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SWE.jpg
2033 # http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SSE.jpg
2034 # (both dated 2003), and
2035 # http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp
2036 # (from a 1998 Canadian Geographic article), the de facto and de jure time
2037 # for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year
2038 # round. Using Google, it's easy to find other websites that confirm this.
2039 # I wasn't able to find how far back this time regimen goes, but since it
2040 # predates the creation of Nunavut, it probably goes back many years....
2041 # The Inuktitut name of Coral Harbour is Sallit, but it's rarely used.
2042 #
2043 # From Paul Eggert (2005-07-26):
2044 # For lack of better information, assume that Southampton Island observed
2045 # daylight saving only during wartime.
2046
2047 # From Chris Walton (2007-03-01):
2048 # ... the community of Resolute (located on Cornwallis Island in
2049 # Nunavut) moved from Central Time to Eastern Time last November.
2050 # Basically the community did not change its clocks at the end of
2051 # daylight saving....
2052 # http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html
2053
2054 # From Chris Walton (2011-03-21):
2055 # Back in 2007 I initiated the creation of a new "zone file" for Resolute
2056 # Bay. Resolute Bay is a small community located about 900km north of
2057 # the Arctic Circle. The zone file was required because Resolute Bay had
2058 # decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007.
2059 #
2060 # According to new information which I received last week, Resolute Bay
2061 # went back to using UTC-6 in the winter of 2007-2008...
2062 #
2063 # On March 11/2007 most of Canada went onto daylight saving. On March
2064 # 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I
2065 # talked to somebody that was both knowledgeable and helpful. I was able
2066 # to confirm that Resolute Bay was still operating on UTC-5. It was
2067 # explained to me that Resolute Bay had been on the Eastern Time zone
2068 # (EST) in the winter, and was now back on the Central Time zone (CDT).
2069 # i.e. the time zone had changed twice in the last year but the clocks
2070 # had not moved. The residents had to know which time zone they were in
2071 # so they could follow the correct TV schedule...
2072 #
2073 # On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I
2074 # phoned the Resolute Bay hamlet office...[D]ue to the challenging nature
2075 # of the phone call, I decided to seek out an alternate source of
2076 # information. I found an e-mail address for somebody by the name of
2077 # Stephanie Adams whose job was listed as "Inns North Support Officer for
2078 # Arctic Co-operatives." I was under the impression that Stephanie lived
2079 # and worked in Resolute Bay...
2080 #
2081 # On March 14/2011 I phoned the hamlet office again. I was told that
2082 # Resolute Bay had been using Central Standard Time over the winter of
2083 # 2010-2011 and that the clocks had therefore been moved one hour ahead
2084 # on March 13/2011. The person I talked to was aware that Resolute Bay
2085 # had previously experimented with Eastern Standard Time but he could not
2086 # tell me when the practice had stopped.
2087 #
2088 # On March 17/2011 I searched the Web to find an e-mail address of
2089 # somebody that might be able to tell me exactly when Resolute Bay went
2090 # off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz
2091 # used to be the mayor of Resolute Bay and he apparently owns half the
2092 # businesses including "South Camp Inn." This website has some info on
2093 # Aziz:
2094 # <a href="http://www.uphere.ca/node/493">
2095 # http://www.uphere.ca/node/493
2096 # </a>
2097 #
2098 # I sent Aziz an e-mail asking when Resolute Bay had stopped using
2099 # Eastern Standard Time.
2100 #
2101 # Aziz responded quickly with this: "hi, The time was not changed for the
2102 # 1 year only, the following year, the community went back to the old way
2103 # of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in
2104 # the winter Zulu plus 6 hrs"
2105 #
2106 # This of course conflicted with everything I had ascertained in November 2008.
2107 #
2108 # I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz
2109 # responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You
2110 # may want to check with the weather office in Resolute Bay or do a
2111 # search on the weather through Env. Canada. web site"
2112 #
2113 # If I had realized the Stephanie did not live in Resolute Bay I would
2114 # never have contacted her. I now believe that all the information I
2115 # obtained in November 2008 should be ignored...
2116 # I apologize for reporting incorrect information in 2008.
2117
2118 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2119 Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
2120 Rule NT_YK 1918 only - Oct 27 2:00 0 S
2121 Rule NT_YK 1919 only - May 25 2:00 1:00 D
2122 Rule NT_YK 1919 only - Nov 1 0:00 0 S
2123 Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War
2124 Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace
2125 Rule NT_YK 1945 only - Sep 30 2:00 0 S
2126 Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
2127 Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
2128 Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
2129 Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S
2130 Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D
2131 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2132 # aka Panniqtuuq
2133 Zone America/Pangnirtung 0 - zzz 1921 # trading post est.
2134 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
2135 -5:00 Canada E%sT 1999 Oct 31 2:00
2136 -6:00 Canada C%sT 2000 Oct 29 2:00
2137 -5:00 Canada E%sT
2138 # formerly Frobisher Bay
2139 Zone America/Iqaluit 0 - zzz 1942 Aug # Frobisher Bay est.
2140 -5:00 NT_YK E%sT 1999 Oct 31 2:00
2141 -6:00 Canada C%sT 2000 Oct 29 2:00
2142 -5:00 Canada E%sT
2143 # aka Qausuittuq
2144 Zone America/Resolute 0 - zzz 1947 Aug 31 # Resolute founded
2145 -6:00 NT_YK C%sT 2000 Oct 29 2:00
2146 -5:00 - EST 2001 Apr 1 3:00
2147 -6:00 Canada C%sT 2006 Oct 29 2:00
2148 -5:00 - EST 2007 Mar 11 3:00
2149 -6:00 Canada C%sT
2150 # aka Kangiqiniq
2151 Zone America/Rankin_Inlet 0 - zzz 1957 # Rankin Inlet founded
2152 -6:00 NT_YK C%sT 2000 Oct 29 2:00
2153 -5:00 - EST 2001 Apr 1 3:00
2154 -6:00 Canada C%sT
2155 # aka Iqaluktuuttiaq
2156 Zone America/Cambridge_Bay 0 - zzz 1920 # trading post est.?
2157 -7:00 NT_YK M%sT 1999 Oct 31 2:00
2158 -6:00 Canada C%sT 2000 Oct 29 2:00
2159 -5:00 - EST 2000 Nov 5 0:00
2160 -6:00 - CST 2001 Apr 1 3:00
2161 -7:00 Canada M%sT
2162 Zone America/Yellowknife 0 - zzz 1935 # Yellowknife founded?
2163 -7:00 NT_YK M%sT 1980
2164 -7:00 Canada M%sT
2165 Zone America/Inuvik 0 - zzz 1953 # Inuvik founded
2166 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
2167 -7:00 NT_YK M%sT 1980
2168 -7:00 Canada M%sT
2169 Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
2170 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
2171 -8:00 NT_YK P%sT 1980
2172 -8:00 Canada P%sT
2173 Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
2174 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
2175 -8:00 NT_YK P%sT 1980
2176 -8:00 Canada P%sT
2177
2178
2179 ###############################################################################
2180
2181 # Mexico
2182
2183 # From Paul Eggert (2001-03-05):
2184 # The Investigation and Analysis Service of the
2185 # Mexican Library of Congress (MLoC) has published a
2186 # <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/">
2187 # history of Mexican local time (in Spanish)
2188 # </a>.
2189 #
2190 # Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
2191 # (In all cases we go with the MLoC.)
2192 # S&P report that Baja was at -8:00 in 1922/1923.
2193 # S&P say the 1930 transition in Baja was 1930-11-16.
2194 # S&P report no DST during summer 1931.
2195 # S&P report a transition at 1932-03-30 23:00, not 1932-04-01.
2196
2197 # From Gwillim Law (2001-02-20):
2198 # There are some other discrepancies between the Decrees page and the
2199 # tz database. I think they can best be explained by supposing that
2200 # the researchers who prepared the Decrees page failed to find some of
2201 # the relevant documents.
2202
2203 # From Alan Perry (1996-02-15):
2204 # A guy from our Mexico subsidiary finally found the Presidential Decree
2205 # outlining the timezone changes in Mexico.
2206 #
2207 # ------------- Begin Forwarded Message -------------
2208 #
2209 # I finally got my hands on the Official Presidential Decree that sets up the
2210 # rules for the DST changes. The rules are:
2211 #
2212 # 1. The country is divided in 3 timezones:
2213 # - Baja California Norte (the Mexico/BajaNorte TZ)
2214 # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
2215 # - The rest of the country (the Mexico/General TZ)
2216 #
2217 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
2218 # at 2:00 AM, the times in each zone are as follows:
2219 # BajaNorte: GMT+7
2220 # BajaSur: GMT+6
2221 # General: GMT+5
2222 #
2223 # 3. The rest of the year, the times are as follows:
2224 # BajaNorte: GMT+8
2225 # BajaSur: GMT+7
2226 # General: GMT+6
2227 #
2228 # The Decree was published in Mexico's Official Newspaper on January 4th.
2229 #
2230 # -------------- End Forwarded Message --------------
2231 # From Paul Eggert (1996-06-12):
2232 # For an English translation of the decree, see
2233 # <a href="http://mexico-travel.com/extra/timezone_eng.html">
2234 # ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
2235 # </a>
2236
2237 # From Rives McDow (1998-10-08):
2238 # The State of Quintana Roo has reverted back to central STD and DST times
2239 # (i.e. UTC -0600 and -0500 as of 1998-08-02).
2240
2241 # From Rives McDow (2000-01-10):
2242 # Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
2243 # zone 5 hours from the International Date Line, and will not observe daylight
2244 # savings time so as to stay on the same time zone as the southern part of
2245 # Arizona year round.
2246
2247 # From Jesper Norgaard, translating
2248 # <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
2249 # In Oaxaca, the 55.000 teachers from the Section 22 of the National
2250 # Syndicate of Education Workers, refuse to apply daylight saving each
2251 # year, so that the more than 10,000 schools work at normal hour the
2252 # whole year.
2253
2254 # From Gwillim Law (2001-01-19):
2255 # <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
2256 # (translated):...
2257 # January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
2258 # that Summer Time will be reduced from seven to five months, starting
2259 # this year....
2260 # <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001>
2261 # [translated], says "summer time will ... take effect on the first Sunday
2262 # in May, and end on the last Sunday of September.
2263
2264 # From Arthur David Olson (2001-01-25):
2265 # The 2001-01-24 traditional Washington Post contained the page one
2266 # story "Timely Issue Divides Mexicans."...
2267 # http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
2268 # ... Mexico City Mayor Lopez Obrador "...is threatening to keep
2269 # Mexico City and its 20 million residents on a different time than
2270 # the rest of the country..." In particular, Lopez Obrador would abolish
2271 # observation of Daylight Saving Time.
2272
2273 # <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre">
2274 # Official statute published by the Energy Department
2275 # </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
2276 # and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03).
2277
2278 # From Paul Eggert (2001-03-03):
2279 #
2280 # <a href="http://www.latimes.com/news/nation/20010303/t000018766.html">
2281 # James F. Smith writes in today's LA Times
2282 # </a>
2283 # * Sonora will continue to observe standard time.
2284 # * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that
2285 # the Federal District will not adopt DST.
2286 # * 4 of 16 district leaders announced they'll ignore the decree.
2287 # * The decree does not affect federal-controlled facilities including
2288 # the airport, banks, hospitals, and schools.
2289 #
2290 # For now we'll assume that the Federal District will bow to federal rules.
2291
2292 # From Jesper Norgaard (2001-04-01):
2293 # I found some references to the Mexican application of daylight
2294 # saving, which modifies what I had already sent you, stating earlier
2295 # that a number of northern Mexican states would go on daylight
2296 # saving. The modification reverts this to only cover Baja California
2297 # (Norte), while all other states (except Sonora, who has no daylight
2298 # saving all year) will follow the original decree of president
2299 # Vicente Fox, starting daylight saving May 6, 2001 and ending
2300 # September 30, 2001.
2301 # References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp>
2302 # Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
2303
2304 # From Reuters (2001-09-04):
2305 # Mexico's Supreme Court on Tuesday declared that daylight savings was
2306 # unconstitutional in Mexico City, creating the possibility the
2307 # capital will be in a different time zone from the rest of the nation
2308 # next year.... The Supreme Court's ruling takes effect at 2:00
2309 # a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
2310 # standard time. "This is so residents of the Federal District are not
2311 # subject to unexpected time changes," a statement from the court said.
2312
2313 # From Jesper Norgaard Welen (2002-03-12):
2314 # ... consulting my local grocery store(!) and my coworkers, they all insisted
2315 # that a new decision had been made to reinstate US style DST in Mexico....
2316 # http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
2317 # confirms this. Sonora as usual is the only state where DST is not applied.
2318
2319 # From Steffen Thorsen (2009-12-28):
2320 #
2321 # Steffen Thorsen wrote:
2322 # > Mexico's House of Representatives has approved a proposal for northern
2323 # > Mexico's border cities to share the same daylight saving schedule as
2324 # > the United States.
2325 # Now this has passed both the Congress and the Senate, so starting from
2326 # 2010, some border regions will be the same:
2327 # <a href="http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/">
2328 # http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/
2329 # </a>
2330 # <a href="http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939">
2331 # http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939
2332 # </a>
2333 # (Spanish)
2334 #
2335 # Could not find the new law text, but the proposed law text changes are here:
2336 # <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf">
2337 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf
2338 # </a>
2339 # (Gaceta Parlamentaria)
2340 #
2341 # There is also a list of the votes here:
2342 # <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html">
2343 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html
2344 # </a>
2345 #
2346 # Our page:
2347 # <a href="http://www.timeanddate.com/news/time/north-mexico-dst-change.html">
2348 # http://www.timeanddate.com/news/time/north-mexico-dst-change.html
2349 # </a>
2350
2351 # From Arthur David Olson (2010-01-20):
2352 # The page
2353 # <a href="http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010">
2354 # http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
2355 # </a>
2356 # includes this text:
2357 # En los municipios fronterizos de Tijuana y Mexicali en Baja California;
2358 # Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila;
2359 # Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en
2360 # Tamaulipas, la aplicación de este horario estacional surtirá efecto
2361 # desde las dos horas del segundo domingo de marzo y concluirá a las dos
2362 # horas del primer domingo de noviembre.
2363 # En los municipios fronterizos que se encuentren ubicados en la franja
2364 # fronteriza norte en el territorio comprendido entre la línea
2365 # internacional y la línea paralela ubicada a una distancia de veinte
2366 # kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el
2367 # interior del país, la aplicación de este horario estacional surtirá
2368 # efecto desde las dos horas del segundo domingo de marzo y concluirá a
2369 # las dos horas del primer domingo de noviembre.
2370
2371 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2372 Rule Mexico 1939 only - Feb 5 0:00 1:00 D
2373 Rule Mexico 1939 only - Jun 25 0:00 0 S
2374 Rule Mexico 1940 only - Dec 9 0:00 1:00 D
2375 Rule Mexico 1941 only - Apr 1 0:00 0 S
2376 Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
2377 Rule Mexico 1944 only - May 1 0:00 0 S
2378 Rule Mexico 1950 only - Feb 12 0:00 1:00 D
2379 Rule Mexico 1950 only - Jul 30 0:00 0 S
2380 Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
2381 Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
2382 Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
2383 Rule Mexico 2001 only - Sep lastSun 2:00 0 S
2384 Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
2385 Rule Mexico 2002 max - Oct lastSun 2:00 0 S
2386 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2387 # Quintana Roo
2388 Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
2389 -6:00 - CST 1981 Dec 23
2390 -5:00 Mexico E%sT 1998 Aug 2 2:00
2391 -6:00 Mexico C%sT
2392 # Campeche, Yucatan
2393 Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
2394 -6:00 - CST 1981 Dec 23
2395 -5:00 - EST 1982 Dec 2
2396 -6:00 Mexico C%sT
2397 # Coahuila, Durango, Nuevo Leon, Tamaulipas (near US border)
2398 Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00
2399 -6:00 - CST 1988
2400 -6:00 US C%sT 1989
2401 -6:00 Mexico C%sT 2010
2402 -6:00 US C%sT
2403 # Coahuila, Durango, Nuevo Leon, Tamaulipas (away from US border)
2404 Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
2405 -6:00 - CST 1988
2406 -6:00 US C%sT 1989
2407 -6:00 Mexico C%sT
2408 # Central Mexico
2409 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
2410 -7:00 - MST 1927 Jun 10 23:00
2411 -6:00 - CST 1930 Nov 15
2412 -7:00 - MST 1931 May 1 23:00
2413 -6:00 - CST 1931 Oct
2414 -7:00 - MST 1932 Apr 1
2415 -6:00 Mexico C%sT 2001 Sep 30 02:00
2416 -6:00 - CST 2002 Feb 20
2417 -6:00 Mexico C%sT
2418 # Chihuahua (near US border)
2419 Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20
2420 -7:00 - MST 1927 Jun 10 23:00
2421 -6:00 - CST 1930 Nov 15
2422 -7:00 - MST 1931 May 1 23:00
2423 -6:00 - CST 1931 Oct
2424 -7:00 - MST 1932 Apr 1
2425 -6:00 - CST 1996
2426 -6:00 Mexico C%sT 1998
2427 -6:00 - CST 1998 Apr Sun>=1 3:00
2428 -7:00 Mexico M%sT 2010
2429 -7:00 US M%sT
2430 # Chihuahua (away from US border)
2431 Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
2432 -7:00 - MST 1927 Jun 10 23:00
2433 -6:00 - CST 1930 Nov 15
2434 -7:00 - MST 1931 May 1 23:00
2435 -6:00 - CST 1931 Oct
2436 -7:00 - MST 1932 Apr 1
2437 -6:00 - CST 1996
2438 -6:00 Mexico C%sT 1998
2439 -6:00 - CST 1998 Apr Sun>=1 3:00
2440 -7:00 Mexico M%sT
2441 # Sonora
2442 Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
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 1999
2452 -7:00 - MST
2453
2454 # From Alexander Krivenyshev (2010-04-21):
2455 # According to news, Bahía de Banderas (Mexican state of Nayarit)
2456 # changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to
2457 # share the same time zone as nearby city Puerto Vallarta, Jalisco).
2458 #
2459 # (Spanish)
2460 # Bahía de Banderas homologa su horario al del centro del
2461 # país, a partir de este domingo
2462 # <a href="http://www.nayarit.gob.mx/notes.asp?id=20748">
2463 # http://www.nayarit.gob.mx/notes.asp?id=20748
2464 # </a>
2465 #
2466 # Bahía de Banderas homologa su horario con el del Centro del
2467 # País
2468 # <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">
2469 # 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"
2470 # </a>
2471 #
2472 # (English)
2473 # Puerto Vallarta and Bahía de Banderas: One Time Zone
2474 # <a href="http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml">
2475 # http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml
2476 # </a>
2477 #
2478 # or
2479 # <a href="http://www.worldtimezone.com/dst_news/dst_news_mexico08.html">
2480 # http://www.worldtimezone.com/dst_news/dst_news_mexico08.html
2481 # </a>
2482 #
2483 # "Mexico's Senate approved the amendments to the Mexican Schedule System that
2484 # will allow Bahía de Banderas and Puerto Vallarta to share the same time
2485 # zone ..."
2486 # Baja California Sur, Nayarit, Sinaloa
2487
2488 # From Arthur David Olson (2010-05-01):
2489 # Use "Bahia_Banderas" to keep the name to fourteen characters.
2490
2491 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
2492 -7:00 - MST 1927 Jun 10 23:00
2493 -6:00 - CST 1930 Nov 15
2494 -7:00 - MST 1931 May 1 23:00
2495 -6:00 - CST 1931 Oct
2496 -7:00 - MST 1932 Apr 1
2497 -6:00 - CST 1942 Apr 24
2498 -7:00 - MST 1949 Jan 14
2499 -8:00 - PST 1970
2500 -7:00 Mexico M%sT
2501
2502 Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00
2503 -7:00 - MST 1927 Jun 10 23:00
2504 -6:00 - CST 1930 Nov 15
2505 -7:00 - MST 1931 May 1 23:00
2506 -6:00 - CST 1931 Oct
2507 -7:00 - MST 1932 Apr 1
2508 -6:00 - CST 1942 Apr 24
2509 -7:00 - MST 1949 Jan 14
2510 -8:00 - PST 1970
2511 -7:00 Mexico M%sT 2010 Apr 4 2:00
2512 -6:00 Mexico C%sT
2513
2514 # Baja California (near US border)
2515 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
2516 -7:00 - MST 1924
2517 -8:00 - PST 1927 Jun 10 23:00
2518 -7:00 - MST 1930 Nov 15
2519 -8:00 - PST 1931 Apr 1
2520 -8:00 1:00 PDT 1931 Sep 30
2521 -8:00 - PST 1942 Apr 24
2522 -8:00 1:00 PWT 1945 Aug 14 23:00u
2523 -8:00 1:00 PPT 1945 Nov 12 # Peace
2524 -8:00 - PST 1948 Apr 5
2525 -8:00 1:00 PDT 1949 Jan 14
2526 -8:00 - PST 1954
2527 -8:00 CA P%sT 1961
2528 -8:00 - PST 1976
2529 -8:00 US P%sT 1996
2530 -8:00 Mexico P%sT 2001
2531 -8:00 US P%sT 2002 Feb 20
2532 -8:00 Mexico P%sT 2010
2533 -8:00 US P%sT
2534 # Baja California (away from US border)
2535 Zone America/Santa_Isabel -7:39:28 - LMT 1922 Jan 1 0:20:32
2536 -7:00 - MST 1924
2537 -8:00 - PST 1927 Jun 10 23:00
2538 -7:00 - MST 1930 Nov 15
2539 -8:00 - PST 1931 Apr 1
2540 -8:00 1:00 PDT 1931 Sep 30
2541 -8:00 - PST 1942 Apr 24
2542 -8:00 1:00 PWT 1945 Aug 14 23:00u
2543 -8:00 1:00 PPT 1945 Nov 12 # Peace
2544 -8:00 - PST 1948 Apr 5
2545 -8:00 1:00 PDT 1949 Jan 14
2546 -8:00 - PST 1954
2547 -8:00 CA P%sT 1961
2548 -8:00 - PST 1976
2549 -8:00 US P%sT 1996
2550 -8:00 Mexico P%sT 2001
2551 -8:00 US P%sT 2002 Feb 20
2552 -8:00 Mexico P%sT
2553 # From Paul Eggert (2006-03-22):
2554 # Formerly there was an America/Ensenada zone, which differed from
2555 # America/Tijuana only in that it did not observe DST from 1976
2556 # through 1995. This was as per Shanks (1999). But Shanks & Pottenger say
2557 # Ensenada did not observe DST from 1948 through 1975. Guy Harris reports
2558 # that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and
2559 # Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
2560 # DST-observance was a town-by-town matter back then. This concerns
2561 # data after 1970 so most likely there should be at least one Zone
2562 # other than America/Tijuana for Baja, but it's not clear yet what its
2563 # name or contents should be.
2564 #
2565 # Revillagigedo Is
2566 # no information
2567
2568 ###############################################################################
2569
2570 # Anguilla
2571 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2572 Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
2573 -4:00 - AST
2574
2575 # Antigua and Barbuda
2576 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2577 Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
2578 -5:00 - EST 1951
2579 -4:00 - AST
2580
2581 # Bahamas
2582 #
2583 # For 1899 Milne gives -5:09:29.5; round that.
2584 #
2585 # From Sue Williams (2006-12-07):
2586 # The Bahamas announced about a month ago that they plan to change their DST
2587 # rules to sync with the U.S. starting in 2007....
2588 # http://www.jonesbahamas.com/?c=45&a=10412
2589
2590 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2591 Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S
2592 Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D
2593 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2594 Zone America/Nassau -5:09:30 - LMT 1912 Mar 2
2595 -5:00 Bahamas E%sT 1976
2596 -5:00 US E%sT
2597
2598 # Barbados
2599
2600 # For 1899 Milne gives -3:58:29.2; round that.
2601
2602 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2603 Rule Barb 1977 only - Jun 12 2:00 1:00 D
2604 Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
2605 Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
2606 Rule Barb 1979 only - Sep 30 2:00 0 S
2607 Rule Barb 1980 only - Sep 25 2:00 0 S
2608 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2609 Zone America/Barbados -3:58:29 - LMT 1924 # Bridgetown
2610 -3:58:29 - BMT 1932 # Bridgetown Mean Time
2611 -4:00 Barb A%sT
2612
2613 # Belize
2614 # Whitman entirely disagrees with Shanks; go with Shanks & Pottenger.
2615 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2616 Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
2617 Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
2618 Rule Belize 1973 only - Dec 5 0:00 1:00 D
2619 Rule Belize 1974 only - Feb 9 0:00 0 S
2620 Rule Belize 1982 only - Dec 18 0:00 1:00 D
2621 Rule Belize 1983 only - Feb 12 0:00 0 S
2622 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2623 Zone America/Belize -5:52:48 - LMT 1912 Apr
2624 -6:00 Belize C%sT
2625
2626 # Bermuda
2627
2628 # For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower,
2629 # Bermuda dockyard, Ireland I; round that.
2630
2631 # From Dan Jones, reporting in The Royal Gazette (2006-06-26):
2632
2633 # Next year, however, clocks in the US will go forward on the second Sunday
2634 # in March, until the first Sunday in November. And, after the Time Zone
2635 # (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2636 # Friday, the same thing will happen in Bermuda.
2637 # http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2638
2639 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2640 Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton
2641 -4:00 - AST 1974 Apr 28 2:00
2642 -4:00 Bahamas A%sT 1976
2643 -4:00 US A%sT
2644
2645 # Cayman Is
2646 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2647 Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
2648 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
2649 -5:00 - EST
2650
2651 # Costa Rica
2652
2653 # Milne gives -5:36:13.3 as San Jose mean time; round to nearest.
2654
2655 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2656 Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
2657 Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
2658 Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
2659 # IATA SSIM (1991-09) says the following was at 1:00;
2660 # go with Shanks & Pottenger.
2661 Rule CR 1991 only - Jul 1 0:00 0 S
2662 Rule CR 1992 only - Mar 15 0:00 0 S
2663 # There are too many San Joses elsewhere, so we'll use `Costa Rica'.
2664 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2665 Zone America/Costa_Rica -5:36:13 - LMT 1890 # San Jose
2666 -5:36:13 - SJMT 1921 Jan 15 # San Jose Mean Time
2667 -6:00 CR C%sT
2668 # Coco
2669 # no information; probably like America/Costa_Rica
2670
2671 # Cuba
2672
2673 # From Paul Eggert (2013-02-21):
2674 # Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57
2675 # for the port, and -5:30 for meteorological observations.
2676 # For now, stick with Shanks & Pottenger.
2677
2678 # From Arthur David Olson (1999-03-29):
2679 # The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
2680 # the Cuban National Team and the Baltimore Orioles was carried live on
2681 # the Orioles Radio Network, including affiliate WTOP in Washington, DC.
2682 # During the game, play-by-play announcer Jim Hunter noted that
2683 # "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
2684 # Time today." (The "two hour" remark referred to losing one hour of
2685 # sleep on 1999-03-28--when the announcers were in Cuba as it switched
2686 # to DST--and one more hour on 1999-04-04--when the announcers will have
2687 # returned to Baltimore, which switches on that date.)
2688
2689 # From Evert van der Veer via Steffen Thorsen (2004-10-28):
2690 # Cuba is not going back to standard time this year.
2691 # From Paul Eggert (2006-03-22):
2692 # http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
2693 # says that it's due to a problem at the Antonio Guiteras
2694 # thermoelectric plant, and says "This October there will be no return
2695 # to normal hours (after daylight saving time)".
2696 # For now, let's assume that it's a temporary measure.
2697
2698 # From Carlos A. Carnero Delgado (2005-11-12):
2699 # This year (just like in 2004-2005) there's no change in time zone
2700 # adjustment in Cuba. We will stay in daylight saving time:
2701 # http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html
2702
2703 # From Jesper Norgaard Welen (2006-10-21):
2704 # An article in GRANMA INTERNACIONAL claims that Cuba will end
2705 # the 3 years of permanent DST next weekend, see
2706 # http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html
2707 # "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
2708 # watches should be set back one hour -- going back to 00:00 hours -- returning
2709 # to the normal schedule....
2710
2711 # From Paul Eggert (2007-03-02):
2712 # http://www.granma.cubaweb.cu/english/news/art89.html, dated yesterday,
2713 # says Cuban clocks will advance at midnight on March 10.
2714 # For lack of better information, assume Cuba will use US rules,
2715 # except that it switches at midnight standard time as usual.
2716 #
2717 # From Steffen Thorsen (2007-10-25):
2718 # Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
2719 # earlier - on the last Sunday of October, just like in 2006.
2720 #
2721 # He supplied these references:
2722 #
2723 # http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES
2724 # http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm
2725 #
2726 # From Alex Kryvenishev (2007-10-25):
2727 # Here is also article from Granma (Cuba):
2728 #
2729 # [Regira] el Horario Normal desde el [proximo] domingo 28 de octubre
2730 # http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
2731 #
2732 # http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
2733
2734 # From Arthur David Olson (2008-03-09):
2735 # I'm in Maryland which is now observing United States Eastern Daylight
2736 # Time. At 9:44 local time I used RealPlayer to listen to
2737 # <a href="http://media.enet.cu/radioreloj">
2738 # http://media.enet.cu/radioreloj
2739 # </a>, a Cuban information station, and heard
2740 # the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
2741 # indicating that Cuba is still on standard time.
2742
2743 # From Steffen Thorsen (2008-03-12):
2744 # It seems that Cuba will start DST on Sunday, 2007-03-16...
2745 # It was announced yesterday, according to this source (in Spanish):
2746 # <a href="http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm">
2747 # http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
2748 # </a>
2749 #
2750 # Some more background information is posted here:
2751 # <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html">
2752 # http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
2753 # </a>
2754 #
2755 # The article also says that Cuba has been observing DST since 1963,
2756 # while Shanks (and tzdata) has 1965 as the first date (except in the
2757 # 1940's). Many other web pages in Cuba also claim that it has been
2758 # observed since 1963, but with the exception of 1970 - an exception
2759 # which is not present in tzdata/Shanks. So there is a chance we need to
2760 # change some historic records as well.
2761 #
2762 # One example:
2763 # <a href="http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm">
2764 # http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
2765 # </a>
2766
2767 # From Jesper Norgaard Welen (2008-03-13):
2768 # The Cuban time change has just been confirmed on the most authoritative
2769 # web site, the Granma. Please check out
2770 # <a href="http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html">
2771 # http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
2772 # </a>
2773 #
2774 # Basically as expected after Steffen Thorsens information, the change
2775 # will take place midnight between Saturday and Sunday.
2776
2777 # From Arthur David Olson (2008-03-12):
2778 # Assume Sun>=15 (third Sunday) going forward.
2779
2780 # From Alexander Krivenyshev (2009-03-04)
2781 # According to the Radio Reloj - Cuba will start Daylight Saving Time on
2782 # midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009-
2783 # not on midnight March 14 / March 15 as previously thought.
2784 #
2785 # <a href="http://www.worldtimezone.com/dst_news/dst_news_cuba05.html">
2786 # http://www.worldtimezone.com/dst_news/dst_news_cuba05.html
2787 # (in Spanish)
2788 # </a>
2789
2790 # From Arthur David Olson (2009-03-09)
2791 # I listened over the Internet to
2792 # <a href="http://media.enet.cu/readioreloj">
2793 # http://media.enet.cu/readioreloj
2794 # </a>
2795 # this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
2796 # the time was announced as "diez cinco"--the same time as here, indicating
2797 # that has indeed switched to DST. Assume second Sunday from 2009 forward.
2798
2799 # From Steffen Thorsen (2011-03-08):
2800 # Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00
2801 # this year. Nothing about the end date known so far (if that has
2802 # changed at all).
2803 #
2804 # Source:
2805 # <a href="http://granma.co.cu/2011/03/08/nacional/artic01.html">
2806 # http://granma.co.cu/2011/03/08/nacional/artic01.html
2807 # </a>
2808 #
2809 # Our info:
2810 # <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html">
2811 # http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html
2812 # </a>
2813 #
2814 # From Steffen Thorsen (2011-10-30)
2815 # Cuba will end DST two weeks later this year. Instead of going back
2816 # tonight, it has been delayed to 2011-11-13 at 01:00.
2817 #
2818 # One source (Spanish)
2819 # <a href="http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html">
2820 # http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html
2821 # </a>
2822 #
2823 # Our page:
2824 # <a href="http://www.timeanddate.com/news/time/cuba-time-changes-2011.html">
2825 # http://www.timeanddate.com/news/time/cuba-time-changes-2011.html
2826 # </a>
2827 #
2828 # From Steffen Thorsen (2012-03-01)
2829 # According to Radio Reloj, Cuba will start DST on Midnight between March
2830 # 31 and April 1.
2831 #
2832 # Radio Reloj has the following info (Spanish):
2833 # <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">
2834 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril
2835 # </a>
2836 #
2837 # Our info on it:
2838 # <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html">
2839 # http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html
2840 # </a>
2841
2842 # From Steffen Thorsen (2012-11-03):
2843 # Radio Reloj and many other sources report that Cuba is changing back
2844 # to standard time on 2012-11-04:
2845 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre
2846 # From Paul Eggert (2012-11-03):
2847 # For now, assume the future rule is first Sunday in November.
2848
2849 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2850 Rule Cuba 1928 only - Jun 10 0:00 1:00 D
2851 Rule Cuba 1928 only - Oct 10 0:00 0 S
2852 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
2853 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
2854 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
2855 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
2856 Rule Cuba 1965 only - Jun 1 0:00 1:00 D
2857 Rule Cuba 1965 only - Sep 30 0:00 0 S
2858 Rule Cuba 1966 only - May 29 0:00 1:00 D
2859 Rule Cuba 1966 only - Oct 2 0:00 0 S
2860 Rule Cuba 1967 only - Apr 8 0:00 1:00 D
2861 Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
2862 Rule Cuba 1968 only - Apr 14 0:00 1:00 D
2863 Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
2864 Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
2865 Rule Cuba 1972 1974 - Oct 8 0:00 0 S
2866 Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
2867 Rule Cuba 1978 only - May 7 0:00 1:00 D
2868 Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
2869 Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
2870 Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
2871 Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
2872 Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
2873 Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
2874 Rule Cuba 1996 only - Oct 6 0:00s 0 S
2875 Rule Cuba 1997 only - Oct 12 0:00s 0 S
2876 Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
2877 Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S
2878 Rule Cuba 2000 2004 - Apr Sun>=1 0:00s 1:00 D
2879 Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S
2880 Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D
2881 Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D
2882 Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D
2883 Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D
2884 Rule Cuba 2011 only - Nov 13 0:00s 0 S
2885 Rule Cuba 2012 only - Apr 1 0:00s 1:00 D
2886 Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S
2887 Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D
2888
2889 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2890 Zone America/Havana -5:29:28 - LMT 1890
2891 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
2892 -5:00 Cuba C%sT
2893
2894 # Dominica
2895 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2896 Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
2897 -4:00 - AST
2898
2899 # Dominican Republic
2900
2901 # From Steffen Thorsen (2000-10-30):
2902 # Enrique Morales reported to me that the Dominican Republic has changed the
2903 # time zone to Eastern Standard Time as of Sunday 29 at 2 am....
2904 # http://www.listin.com.do/antes/261000/republica/princi.html
2905
2906 # From Paul Eggert (2000-12-04):
2907 # That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
2908
2909 # From Rives McDow (2000-12-01):
2910 # Dominican Republic changed its mind and presidential decree on Tuesday,
2911 # November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
2912 # Dominican Republic will be reverting to 8 hours from the International Date
2913 # Line, and will not be using DST in the foreseeable future. The reason they
2914 # decided to use DST was to be in synch with Puerto Rico, who was also going
2915 # to implement DST. When Puerto Rico didn't implement DST, the president
2916 # decided to revert.
2917
2918
2919 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2920 Rule DR 1966 only - Oct 30 0:00 1:00 D
2921 Rule DR 1967 only - Feb 28 0:00 0 S
2922 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
2923 Rule DR 1970 only - Feb 21 0:00 0 S
2924 Rule DR 1971 only - Jan 20 0:00 0 S
2925 Rule DR 1972 1974 - Jan 21 0:00 0 S
2926 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2927 Zone America/Santo_Domingo -4:39:36 - LMT 1890
2928 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
2929 -5:00 DR E%sT 1974 Oct 27
2930 -4:00 - AST 2000 Oct 29 02:00
2931 -5:00 US E%sT 2000 Dec 3 01:00
2932 -4:00 - AST
2933
2934 # El Salvador
2935
2936 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2937 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
2938 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
2939 # There are too many San Salvadors elsewhere, so use America/El_Salvador
2940 # instead of America/San_Salvador.
2941 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2942 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
2943 -6:00 Salv C%sT
2944
2945 # Grenada
2946 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2947 Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
2948 -4:00 - AST
2949
2950 # Guadeloupe
2951 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2952 Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
2953 -4:00 - AST
2954 # St Barthelemy
2955 Link America/Guadeloupe America/St_Barthelemy
2956 # St Martin (French part)
2957 Link America/Guadeloupe America/Marigot
2958
2959 # Guatemala
2960 #
2961 # From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
2962 # Diario Co Latino, at
2963 # http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079,
2964 # says in an article dated 2006-04-19 that the Guatemalan government had
2965 # decided on that date to advance official time by 60 minutes, to lessen the
2966 # impact of the elevated cost of oil.... Daylight saving time will last from
2967 # 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
2968 # From Paul Eggert (2006-06-22):
2969 # The Ministry of Energy and Mines, press release CP-15/2006
2970 # (2006-04-19), says DST ends at 24:00. See
2971 # <http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf>.
2972
2973 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2974 Rule Guat 1973 only - Nov 25 0:00 1:00 D
2975 Rule Guat 1974 only - Feb 24 0:00 0 S
2976 Rule Guat 1983 only - May 21 0:00 1:00 D
2977 Rule Guat 1983 only - Sep 22 0:00 0 S
2978 Rule Guat 1991 only - Mar 23 0:00 1:00 D
2979 Rule Guat 1991 only - Sep 7 0:00 0 S
2980 Rule Guat 2006 only - Apr 30 0:00 1:00 D
2981 Rule Guat 2006 only - Oct 1 0:00 0 S
2982 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2983 Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
2984 -6:00 Guat C%sT
2985
2986 # Haiti
2987 # From Gwillim Law (2005-04-15):
2988 # Risto O. Nykanen wrote me that Haiti is now on DST.
2989 # I searched for confirmation, and I found a
2990 # <a href="http://www.haitianconsulate.org/time.doc"> press release
2991 # on the Web page of the Haitian Consulate in Chicago (2005-03-31),
2992 # </a>. Translated from French, it says:
2993 #
2994 # "The Prime Minister's Communication Office notifies the public in general
2995 # and the press in particular that, following a decision of the Interior
2996 # Ministry and the Territorial Collectivities [I suppose that means the
2997 # provinces], Haiti will move to Eastern Daylight Time in the night from next
2998 # Saturday the 2nd to Sunday the 3rd.
2999 #
3000 # "Consequently, the Prime Minister's Communication Office wishes to inform
3001 # the population that the country's clocks will be set forward one hour
3002 # starting at midnight. This provision will hold until the last Saturday in
3003 # October 2005.
3004 #
3005 # "Port-au-Prince, March 31, 2005"
3006 #
3007 # From Steffen Thorsen (2006-04-04):
3008 # I have been informed by users that Haiti observes DST this year like
3009 # last year, so the current "only" rule for 2005 might be changed to a
3010 # "max" rule or to last until 2006. (Who knows if they will observe DST
3011 # next year or if they will extend their DST like US/Canada next year).
3012 #
3013 # I have found this article about it (in French):
3014 # http://www.haitipressnetwork.com/news.cfm?articleID=7612
3015 #
3016 # The reason seems to be an energy crisis.
3017
3018 # From Stephen Colebourne (2007-02-22):
3019 # Some IATA info: Haiti won't be having DST in 2007.
3020
3021 # From Steffen Thorsen (2012-03-11):
3022 # According to several news sources, Haiti will observe DST this year,
3023 # apparently using the same start and end date as USA/Canada.
3024 # So this means they have already changed their time.
3025 #
3026 # http://www.alterpresse.org/spip.php?article12510
3027 # http://radiovision2000haiti.net/home/?p=13253
3028 #
3029 # From Arthur David Olson (2012-03-11):
3030 # The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to
3031 # 3:00 a.m. rather than the traditional Haitian jump at midnight.
3032 # Assume a US-style fall back as well.
3033
3034 # From Steffen Thorsen (2013-03-10):
3035 # It appears that Haiti is observing DST this year as well, same rules
3036 # as US/Canada. They did it last year as well, and it looks like they
3037 # are going to observe DST every year now...
3038 #
3039 # http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/
3040 # http://www.canalplushaiti.net/?p=6714
3041
3042 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3043 Rule Haiti 1983 only - May 8 0:00 1:00 D
3044 Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
3045 Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
3046 # Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
3047 # Go with IATA.
3048 Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
3049 Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
3050 Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
3051 Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S
3052 Rule Haiti 2012 max - Mar Sun>=8 2:00 1:00 D
3053 Rule Haiti 2012 max - Nov Sun>=1 2:00 0 S
3054 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3055 Zone America/Port-au-Prince -4:49:20 - LMT 1890
3056 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
3057 -5:00 Haiti E%sT
3058
3059 # Honduras
3060 # Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.
3061
3062 # From Paul Eggert (2006-05-05):
3063 # worldtimezone.com reports a 2006-05-02 Spanish-language AP article
3064 # saying Honduras will start using DST midnight Saturday, effective 4
3065 # months until September. La Tribuna reported today
3066 # <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president
3067 # of Honduras, refused to back down on this.
3068
3069 # From Jesper Norgaard Welen (2006-08-08):
3070 # It seems that Honduras has returned from DST to standard time this Monday at
3071 # 00:00 hours (prolonging Sunday to 25 hours duration).
3072 # http://www.worldtimezone.com/dst_news/dst_news_honduras04.html
3073
3074 # From Paul Eggert (2006-08-08):
3075 # Also see Diario El Heraldo, The country returns to standard time (2006-08-08)
3076 # <http://www.elheraldo.hn/nota.php?nid=54941&sec=12>.
3077 # It mentions executive decree 18-2006.
3078
3079 # From Steffen Thorsen (2006-08-17):
3080 # Honduras will observe DST from 2007 to 2009, exact dates are not
3081 # published, I have located this authoritative source:
3082 # http://www.presidencia.gob.hn/noticia.aspx?nId=47
3083
3084 # From Steffen Thorsen (2007-03-30):
3085 # http://www.laprensahn.com/pais_nota.php?id04962=7386
3086 # So it seems that Honduras will not enter DST this year....
3087
3088 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3089 Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D
3090 Rule Hond 1987 1988 - Sep lastSun 0:00 0 S
3091 Rule Hond 2006 only - May Sun>=1 0:00 1:00 D
3092 Rule Hond 2006 only - Aug Mon>=1 0:00 0 S
3093 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3094 Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
3095 -6:00 Hond C%sT
3096 #
3097 # Great Swan I ceded by US to Honduras in 1972
3098
3099 # Jamaica
3100
3101 # From Bob Devine (1988-01-28):
3102 # Follows US rules.
3103
3104 # From U. S. Naval Observatory (1989-01-19):
3105 # JAMAICA 5 H BEHIND UTC
3106
3107 # From Shanks & Pottenger:
3108 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3109 Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
3110 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
3111 -5:00 - EST 1974 Apr 28 2:00
3112 -5:00 US E%sT 1984
3113 -5:00 - EST
3114
3115 # Martinique
3116 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3117 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
3118 -4:04:20 - FFMT 1911 May # Fort-de-France MT
3119 -4:00 - AST 1980 Apr 6
3120 -4:00 1:00 ADT 1980 Sep 28
3121 -4:00 - AST
3122
3123 # Montserrat
3124 # From Paul Eggert (2006-03-22):
3125 # In 1995 volcanic eruptions forced evacuation of Plymouth, the capital.
3126 # world.gazetteer.com says Cork Hill is the most populous location now.
3127 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3128 Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Cork Hill
3129 -4:00 - AST
3130
3131 # Nicaragua
3132 #
3133 # This uses Shanks & Pottenger for times before 2005.
3134 #
3135 # From Steffen Thorsen (2005-04-12):
3136 # I've got reports from 8 different people that Nicaragua just started
3137 # DST on Sunday 2005-04-10, in order to save energy because of
3138 # expensive petroleum. The exact end date for DST is not yet
3139 # announced, only "September" but some sites also say "mid-September".
3140 # Some background information is available on the President's official site:
3141 # http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
3142 # The Decree, no 23-2005 is available here:
3143 # 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
3144 #
3145 # From Paul Eggert (2005-05-01):
3146 # The decree doesn't say anything about daylight saving, but for now let's
3147 # assume that it is daylight saving....
3148 #
3149 # From Gwillim Law (2005-04-21):
3150 # The Associated Press story on the time change, which can be found at
3151 # http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
3152 # and elsewhere, says (fifth paragraph, translated from Spanish): "The last
3153 # time that a change of clocks was applied to save energy was in the year 2000
3154 # during the Arnoldo Aleman administration."...
3155 # The northamerica file says that Nicaragua has been on UTC-6 continuously
3156 # since December 1998. I wasn't able to find any details of Nicaraguan time
3157 # changes in 2000. Perhaps a note could be added to the northamerica file, to
3158 # the effect that we have indirect evidence that DST was observed in 2000.
3159 #
3160 # From Jesper Norgaard Welen (2005-11-02):
3161 # Nicaragua left DST the 2005-10-02 at 00:00 (local time).
3162 # http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
3163 # (2005-09-26)
3164 #
3165 # From Jesper Norgaard Welen (2006-05-05):
3166 # http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410
3167 # (my informal translation)
3168 # By order of the president of the republic, Enrique Bolanos, Nicaragua
3169 # advanced by sixty minutes their official time, yesterday at 2 in the
3170 # morning, and will stay that way until 30.th. of september.
3171 #
3172 # From Jesper Norgaard Welen (2006-09-30):
3173 # http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf
3174 # My informal translation runs:
3175 # The natural sun time is restored in all the national territory, in that the
3176 # time is returned one hour at 01:00 am of October 1 of 2006.
3177 #
3178 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3179 Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
3180 Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
3181 Rule Nic 2005 only - Apr 10 0:00 1:00 D
3182 Rule Nic 2005 only - Oct Sun>=1 0:00 0 S
3183 Rule Nic 2006 only - Apr 30 2:00 1:00 D
3184 Rule Nic 2006 only - Oct Sun>=1 1:00 0 S
3185 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3186 Zone America/Managua -5:45:08 - LMT 1890
3187 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
3188 -6:00 - CST 1973 May
3189 -5:00 - EST 1975 Feb 16
3190 -6:00 Nic C%sT 1992 Jan 1 4:00
3191 -5:00 - EST 1992 Sep 24
3192 -6:00 - CST 1993
3193 -5:00 - EST 1997
3194 -6:00 Nic C%sT
3195
3196 # Panama
3197 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3198 Zone America/Panama -5:18:08 - LMT 1890
3199 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
3200 -5:00 - EST
3201
3202 # Puerto Rico
3203 # There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
3204 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3205 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
3206 -4:00 - AST 1942 May 3
3207 -4:00 US A%sT 1946
3208 -4:00 - AST
3209
3210 # St Kitts-Nevis
3211 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3212 Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
3213 -4:00 - AST
3214
3215 # St Lucia
3216 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3217 Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
3218 -4:04:00 - CMT 1912 # Castries Mean Time
3219 -4:00 - AST
3220
3221 # St Pierre and Miquelon
3222 # There are too many St Pierres elsewhere, so we'll use `Miquelon'.
3223 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3224 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3225 -4:00 - AST 1980 May
3226 -3:00 - PMST 1987 # Pierre & Miquelon Time
3227 -3:00 Canada PM%sT
3228
3229 # St Vincent and the Grenadines
3230 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3231 Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
3232 -4:04:56 - KMT 1912 # Kingstown Mean Time
3233 -4:00 - AST
3234
3235 # Turks and Caicos
3236 #
3237 # From Chris Dunn in
3238 # <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007>
3239 # (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
3240 # daylight saving dates for time changes have been adjusted to match
3241 # the recent U.S. change of dates.
3242 #
3243 # From Brian Inglis (2007-04-28):
3244 # http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
3245 # there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
3246 # rows before that there is an out of date entry for Oct:
3247 # "Eastern Standard Times Begins 2007
3248 # Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
3249 # indicating that the normal ET rules are followed.
3250 #
3251 # From Paul Eggert (2006-05-01):
3252 # Shanks & Pottenger say they use US DST rules, but IATA SSIM (1991/1998)
3253 # says they switch at midnight. Go with Shanks & Pottenger.
3254 #
3255 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3256 Rule TC 1979 1986 - Apr lastSun 2:00 1:00 D
3257 Rule TC 1979 2006 - Oct lastSun 2:00 0 S
3258 Rule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D
3259 Rule TC 2007 max - Mar Sun>=8 2:00 1:00 D
3260 Rule TC 2007 max - Nov Sun>=1 2:00 0 S
3261 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3262 Zone America/Grand_Turk -4:44:32 - LMT 1890
3263 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
3264 -5:00 TC E%sT
3265
3266 # British Virgin Is
3267 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3268 Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
3269 -4:00 - AST
3270
3271 # Virgin Is
3272 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3273 Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
3274 -4:00 - AST