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 # Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county
418 # north of the Salmon River, and the towns of Burgdorf and Warren),
419 # Nevada (except West Wendover), Oregon (except the northern 3/4 of
420 # Malheur county), and Washington
421 #
422 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
423 Rule CA 1948 only - Mar 14 2:00 1:00 D
424 Rule CA 1949 only - Jan 1 2:00 0 S
425 Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
426 Rule CA 1950 1961 - Sep lastSun 2:00 0 S
427 Rule CA 1962 1966 - Oct lastSun 2:00 0 S
428 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
429 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02
430 -8:00 US P%sT 1946
431 -8:00 CA P%sT 1967
432 -8:00 US P%sT
433
434 # Alaska
435 # AK%sT is the modern abbreviation for -9:00 per USNO.
436 #
437 # From Paul Eggert (2001-05-30):
438 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
439 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
440 # This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
441 # also a Friday. Include only the time zone part of this transition,
442 # ignoring the switch from Julian to Gregorian, since we can't represent
443 # the Julian calendar.
444 #
445 # As far as we know, none of the exact locations mentioned below were
446 # permanently inhabited in 1867 by anyone using either calendar.
447 # (Yakutat was colonized by the Russians in 1799, but the settlement
448 # was destroyed in 1805 by a Yakutat-kon war party.) However, there
449 # were nearby inhabitants in some cases and for our purposes perhaps
450 # it's best to simply use the official transition.
451 #
452
453 # From Steve Ferguson (2011-01-31):
454 # The author lives in Alaska and many of the references listed are only
455 # available to Alaskan residents.
456 #
457 # <a href="http://www.alaskahistoricalsociety.org/index.cfm?section=discover%20alaska&page=Glimpses%20of%20the%20Past&viewpost=2&ContentId=98">
458 # http://www.alaskahistoricalsociety.org/index.cfm?section=discover%20alaska&page=Glimpses%20of%20the%20Past&viewpost=2&ContentId=98
459 # </a>
460
461 # From Arthur David Olson (2011-02-01):
462 # Here's database-relevant material from the 2001 "Alaska History" article:
463 #
464 # On September 20 [1979]...DOT...officials decreed that on April 27,
465 # 1980, Juneau and other nearby communities would move to Yukon Time.
466 # Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on
467 # Pacific Time.
468 #
469 # ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the
470 # Department's September 1979 decision. Juneau and other communities in
471 # northern Southeast reverted to Pacific Time on October 26.
472 #
473 # On October 28 [1983]...the Metlakatla Indian Community Council voted
474 # unanimously to keep the reservation on Pacific Time.
475 #
476 # According to DOT official Joanne Petrie, Indian reservations are not
477 # bound to follow time zones imposed by neighboring jurisdictions.
478 #
479 # (The last is consistent with how the database now handles the Navajo
480 # Nation.)
481
482 # From Arthur David Olson (2011-02-09):
483 # I just spoke by phone with a staff member at the Metlakatla Indian
484 # Community office (using contact information available at
485 # <a href="http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla">
486 # http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla
487 # </a>).
488 # It's shortly after 1:00 here on the east coast of the United States;
489 # the staffer said it was shortly after 10:00 there. When I asked whether
490 # that meant they were on Pacific time, they said no--they were on their
491 # own time. I asked about daylight saving; they said it wasn't used. I
492 # did not inquire about practices in the past.
493
494 # From Arthur David Olson (2011-08-17):
495 # For lack of better information, assume that Metlakatla's
496 # abandonment of use of daylight saving resulted from the 1983 vote.
497
498 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
499 Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
500 -8:57:41 - LMT 1900 Aug 20 12:00
501 -8:00 - PST 1942
502 -8:00 US P%sT 1946
503 -8:00 - PST 1969
504 -8:00 US P%sT 1980 Apr 27 2:00
505 -9:00 US Y%sT 1980 Oct 26 2:00
506 -8:00 US P%sT 1983 Oct 30 2:00
507 -9:00 US Y%sT 1983 Nov 30
508 -9:00 US AK%sT
509 Zone America/Sitka 14:58:47 - LMT 1867 Oct 18
510 -9:01:13 - LMT 1900 Aug 20 12:00
511 -8:00 - PST 1942
512 -8:00 US P%sT 1946
513 -8:00 - PST 1969
514 -8:00 US P%sT 1983 Oct 30 2:00
515 -9:00 US Y%sT 1983 Nov 30
516 -9:00 US AK%sT
517 Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18
518 -8:46:18 - LMT 1900 Aug 20 12:00
519 -8:00 - PST 1942
520 -8:00 US P%sT 1946
521 -8:00 - PST 1969
522 -8:00 US P%sT 1983 Oct 30 2:00
523 -8:00 - MeST
524 Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
525 -9:18:55 - LMT 1900 Aug 20 12:00
526 -9:00 - YST 1942
527 -9:00 US Y%sT 1946
528 -9:00 - YST 1969
529 -9:00 US Y%sT 1983 Nov 30
530 -9:00 US AK%sT
531 Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
532 -9:59:36 - LMT 1900 Aug 20 12:00
533 -10:00 - CAT 1942
534 -10:00 US CAT/CAWT 1945 Aug 14 23:00u
535 -10:00 US CAT/CAPT 1946 # Peace
536 -10:00 - CAT 1967 Apr
537 -10:00 - AHST 1969
538 -10:00 US AH%sT 1983 Oct 30 2:00
539 -9:00 US Y%sT 1983 Nov 30
540 -9:00 US AK%sT
541 Zone America/Nome 12:58:21 - LMT 1867 Oct 18
542 -11:01:38 - LMT 1900 Aug 20 12:00
543 -11:00 - NST 1942
544 -11:00 US N%sT 1946
545 -11:00 - NST 1967 Apr
546 -11:00 - BST 1969
547 -11:00 US B%sT 1983 Oct 30 2:00
548 -9:00 US Y%sT 1983 Nov 30
549 -9:00 US AK%sT
550 Zone America/Adak 12:13:21 - LMT 1867 Oct 18
551 -11:46:38 - LMT 1900 Aug 20 12:00
552 -11:00 - NST 1942
553 -11:00 US N%sT 1946
554 -11:00 - NST 1967 Apr
555 -11:00 - BST 1969
556 -11:00 US B%sT 1983 Oct 30 2:00
557 -10:00 US AH%sT 1983 Nov 30
558 -10:00 US HA%sT
559 # The following switches don't quite make our 1970 cutoff.
560 #
561 # Shanks writes that part of southwest Alaska (e.g. Aniak)
562 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
563 # and another part (e.g. Akiak) made the same switch five weeks later.
564 #
565 # From David Flater (2004-11-09):
566 # In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
567 # Historic Preservation Commission, provided this information, which
568 # suggests that Unalaska deviated from statutory time from early 1967
569 # possibly until 1983:
570 #
571 # Minutes of the Unalaska City Council Meeting, January 10, 1967:
572 # "Except for St. Paul and Akutan, Unalaska is the only important
573 # location not on Alaska Standard Time. The following resolution was
574 # made by William Robinson and seconded by Henry Swanson: Be it
575 # resolved that the City of Unalaska hereby goes to Alaska Standard
576 # Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
577 # January 14, Alaska Standard Time.) This resolution was passed with
578 # three votes for and one against."
579
580 # Hawaii
581
582 # From Arthur David Olson (2010-12-09):
583 # "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225
584 # of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09,
585 # the article is available at
586 # <a href="http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf">
587 # http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf
588 # </a>
589 # and indicates that standard time was adopted effective noon, January
590 # 13, 1896 (page 218), that in "1933, the Legislature decreed daylight
591 # saving for the period between the last Sunday of each April and the
592 # last Sunday of each September, but less than a month later repealed the
593 # act," (page 220), that year-round daylight saving time was in effect
594 # from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for
595 # when clocks changed) and that clocks were changed by 30 minutes
596 # effective the second Sunday of June, 1947 (page 219, with no time of
597 # day given for when clocks changed). A footnote for the 1933 changes
598 # cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933)
599 # and Act 163 (approved 21 May 1933)."
600
601 # From Arthur David Olson (2011-01-19):
602 # The following is from "Laws of the Territory of Hawaii Passed by the
603 # Seventeenth Legislature: Regular Session 1933," available (as of
604 # 2011-01-19) at American University's Pence Law Library. Page 85: "Act
605 # 90...At 2 o'clock ante meridian of the last Sunday in April of each
606 # year, the standard time of this Territory shall be advanced one
607 # hour...This Act shall take effect upon its approval. Approved this 26th
608 # day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
609 # Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is
610 # hereby repealed...This Act shall take effect upon its approval, upon
611 # which date the standard time of this Territory shall be restored to
612 # that existing immediately prior to the taking effect of said Act 90.
613 # Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
614 # of the Territory of Hawaii."
615 #
616 # Note that 1933-05-21 was a Sunday.
617 # We're left to guess the time of day when Act 163 was approved; guess noon.
618
619 Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 #Schmitt&Cox
620 -10:30 - HST 1933 Apr 30 2:00 #Laws 1933
621 -10:30 1:00 HDT 1933 May 21 12:00 #Laws 1933+12
622 -10:30 - HST 1942 Feb 09 2:00 #Schmitt&Cox+2
623 -10:30 1:00 HDT 1945 Sep 30 2:00 #Schmitt&Cox+2
624 -10:30 - HST 1947 Jun 8 2:00 #Schmitt&Cox+2
625 -10:00 - HST
626
627 Link Pacific/Honolulu Pacific/Johnston
628
629 # Now we turn to US areas that have diverged from the consensus since 1970.
630
631 # Arizona mostly uses MST.
632
633 # From Paul Eggert (2002-10-20):
634 #
635 # The information in the rest of this paragraph is derived from the
636 # <a href="http://www.dlapr.lib.az.us/links/daylight.htm">
637 # Daylight Saving Time web page (2002-01-23)</a> maintained by the
638 # Arizona State Library, Archives and Public Records.
639 # Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
640 # time, but by federal law railroads, airlines, bus lines, military
641 # personnel, and some engaged in interstate commerce continued to
642 # observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
643 # Gazette says that was the date the law changed, and that 04-01 was
644 # the date the state's clocks would change. In 1945 the State of
645 # Arizona used standard time all year, again with exceptions only as
646 # mandated by federal law. Arizona observed DST in 1967, but Arizona
647 # Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
648 #
649 # Shanks says the 1944 experiment came to an end on 1944-03-17.
650 # Go with the Arizona State Library instead.
651
652 Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42
653 -7:00 US M%sT 1944 Jan 1 00:01
654 -7:00 - MST 1944 Apr 1 00:01
655 -7:00 US M%sT 1944 Oct 1 00:01
656 -7:00 - MST 1967
657 -7:00 US M%sT 1968 Mar 21
658 -7:00 - MST
659 # From Arthur David Olson (1988-02-13):
660 # A writer from the Inter Tribal Council of Arizona, Inc.,
661 # notes in private correspondence dated 1987-12-28 that "Presently, only the
662 # Navajo Nation participates in the Daylight Saving Time policy, due to its
663 # large size and location in three states." (The "only" means that other
664 # tribal nations don't use DST.)
665 #
666 # From Paul Eggert (2013-08-26):
667 # See America/Denver for a zone appropriate for the Navajo Nation.
668
669 # Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
670 # Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
671 # Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
672 # Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
673 # Teton, Twin Falls, Valley, Washington counties, and the southern
674 # quarter of Idaho county) and eastern Oregon (most of Malheur County)
675 # switched four weeks late in 1974.
676 #
677 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
678 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
679 -8:00 US P%sT 1923 May 13 2:00
680 -7:00 US M%sT 1974
681 -7:00 - MST 1974 Feb 3 2:00
682 -7:00 US M%sT
683
684 # Indiana
685 #
686 # For a map of Indiana's time zone regions, see:
687 # <a href="http://www.mccsc.edu/time.html">
688 # What time is it in Indiana?
689 # </a> (2006-03-01)
690 #
691 # From Paul Eggert (2007-08-17):
692 # Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
693 # with the following exceptions:
694 #
695 # - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
696 # Vandenburgh, and Warrick counties have been like America/Chicago.
697 #
698 # - Dearborn and Ohio counties have been like America/New_York.
699 #
700 # - Clark, Floyd, and Harrison counties have been like
701 # America/Kentucky/Louisville.
702 #
703 # - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
704 # and Switzerland counties have their own time zone histories as noted below.
705 #
706 # Shanks partitioned Indiana into 345 regions, each with its own time history,
707 # and wrote "Even newspaper reports present contradictory information."
708 # Those Hoosiers! Such a flighty and changeable people!
709 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
710 #
711 # Other than Indianapolis, the Indiana place names are so nondescript
712 # that they would be ambiguous if we left them at the 'America' level.
713 # So we reluctantly put them all in a subdirectory 'America/Indiana'.
714
715 # From Paul Eggert (2005-08-16):
716 # http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006.
717
718 # From Nathan Stratton Treadway (2006-03-30):
719 # http://www.dot.gov/affairs/dot0406.htm [3705 B]
720 # From Deborah Goldsmith (2006-01-18):
721 # http://dmses.dot.gov/docimages/pdf95/382329_web.pdf [2.9 MB]
722 # From Paul Eggert (2006-01-20):
723 # It says "DOT is relocating the time zone boundary in Indiana to move Starke,
724 # Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
725 # Eastern Time Zone to the Central Time Zone.... The effective date of
726 # this rule is 2:OO a.m. EST Sunday, April 2, 2006, which is the
727 # changeover date from standard time to Daylight Saving Time."
728 # Strictly speaking, this means the affected counties will change their
729 # clocks twice that night, but this obviously is in error. The intent
730 # is that 01:59:59 EST be followed by 02:00:00 CDT.
731
732 # From Gwillim Law (2007-02-10):
733 # The Associated Press has been reporting that Pulaski County, Indiana is
734 # going to switch from Central to Eastern Time on March 11, 2007....
735 # http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL
736
737 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
738 Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
739 Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
740 Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
741 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
742 Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22
743 -6:00 US C%sT 1920
744 -6:00 Indianapolis C%sT 1942
745 -6:00 US C%sT 1946
746 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
747 -5:00 - EST 1957 Sep 29 2:00
748 -6:00 - CST 1958 Apr 27 2:00
749 -5:00 - EST 1969
750 -5:00 US E%sT 1971
751 -5:00 - EST 2006
752 -5:00 US E%sT
753 #
754 # Eastern Crawford County, Indiana, left its clocks alone in 1974,
755 # as well as from 1976 through 2005.
756 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
757 Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
758 Rule Marengo 1951 only - Sep lastSun 2:00 0 S
759 Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
760 Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
761 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
762 Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37
763 -6:00 US C%sT 1951
764 -6:00 Marengo C%sT 1961 Apr 30 2:00
765 -5:00 - EST 1969
766 -5:00 US E%sT 1974 Jan 6 2:00
767 -6:00 1:00 CDT 1974 Oct 27 2:00
768 -5:00 US E%sT 1976
769 -5:00 - EST 2006
770 -5:00 US E%sT
771 #
772 # Daviess, Dubois, Knox, and Martin Counties, Indiana,
773 # switched from eastern to central time in April 2006, then switched back
774 # in November 2007.
775 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
776 Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D
777 Rule Vincennes 1946 only - Sep lastSun 2:00 0 S
778 Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D
779 Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S
780 Rule Vincennes 1955 only - May 1 0:00 1:00 D
781 Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D
782 Rule Vincennes 1960 only - Oct lastSun 2:00 0 S
783 Rule Vincennes 1961 only - Sep lastSun 2:00 0 S
784 Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S
785 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
786 Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53
787 -6:00 US C%sT 1946
788 -6:00 Vincennes C%sT 1964 Apr 26 2:00
789 -5:00 - EST 1969
790 -5:00 US E%sT 1971
791 -5:00 - EST 2006 Apr 2 2:00
792 -6:00 US C%sT 2007 Nov 4 2:00
793 -5:00 US E%sT
794 #
795 # Perry County, Indiana, switched from eastern to central time in April 2006.
796 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
797 Rule Perry 1946 only - Apr lastSun 2:00 1:00 D
798 Rule Perry 1946 only - Sep lastSun 2:00 0 S
799 Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D
800 Rule Perry 1953 1959 - Sep lastSun 2:00 0 S
801 Rule Perry 1955 only - May 1 0:00 1:00 D
802 Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D
803 Rule Perry 1960 only - Oct lastSun 2:00 0 S
804 Rule Perry 1961 only - Sep lastSun 2:00 0 S
805 Rule Perry 1962 1963 - Oct lastSun 2:00 0 S
806 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
807 Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57
808 -6:00 US C%sT 1946
809 -6:00 Perry C%sT 1964 Apr 26 2:00
810 -5:00 - EST 1969
811 -5:00 US E%sT 1971
812 -5:00 - EST 2006 Apr 2 2:00
813 -6:00 US C%sT
814 #
815 # Pike County, Indiana moved from central to eastern time in 1977,
816 # then switched back in 2006, then switched back again in 2007.
817 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
818 Rule Pike 1955 only - May 1 0:00 1:00 D
819 Rule Pike 1955 1960 - Sep lastSun 2:00 0 S
820 Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D
821 Rule Pike 1961 1964 - Oct lastSun 2:00 0 S
822 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
823 Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53
824 -6:00 US C%sT 1955
825 -6:00 Pike C%sT 1965 Apr 25 2:00
826 -5:00 - EST 1966 Oct 30 2:00
827 -6:00 US C%sT 1977 Oct 30 2:00
828 -5:00 - EST 2006 Apr 2 2:00
829 -6:00 US C%sT 2007 Nov 4 2:00
830 -5:00 US E%sT
831 #
832 # Starke County, Indiana moved from central to eastern time in 1991,
833 # then switched back in 2006.
834 # From Arthur David Olson (1991-10-28):
835 # An article on page A3 of the Sunday, 1991-10-27 Washington Post
836 # notes that Starke County switched from Central time to Eastern time as of
837 # 1991-10-27.
838 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
839 Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
840 Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
841 Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
842 Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
843 Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
844 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
845 Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30
846 -6:00 US C%sT 1947
847 -6:00 Starke C%sT 1962 Apr 29 2:00
848 -5:00 - EST 1963 Oct 27 2:00
849 -6:00 US C%sT 1991 Oct 27 2:00
850 -5:00 - EST 2006 Apr 2 2:00
851 -6:00 US C%sT
852 #
853 # Pulaski County, Indiana, switched from eastern to central time in
854 # April 2006 and then switched back in March 2007.
855 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
856 Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D
857 Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S
858 Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S
859 Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S
860 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
861 Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35
862 -6:00 US C%sT 1946
863 -6:00 Pulaski C%sT 1961 Apr 30 2:00
864 -5:00 - EST 1969
865 -5:00 US E%sT 1971
866 -5:00 - EST 2006 Apr 2 2:00
867 -6:00 US C%sT 2007 Mar 11 2:00
868 -5:00 US E%sT
869 #
870 # Switzerland County, Indiana, did not observe DST from 1973 through 2005.
871 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
872 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
873 -6:00 US C%sT 1954 Apr 25 2:00
874 -5:00 - EST 1969
875 -5:00 US E%sT 1973
876 -5:00 - EST 2006
877 -5:00 US E%sT
878
879 # Part of Kentucky left its clocks alone in 1974.
880 # This also includes Clark, Floyd, and Harrison counties in Indiana.
881 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
882 Rule Louisville 1921 only - May 1 2:00 1:00 D
883 Rule Louisville 1921 only - Sep 1 2:00 0 S
884 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
885 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
886 Rule Louisville 1946 only - Jun 2 2:00 0 S
887 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
888 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
889 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
890 Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
891 -6:00 US C%sT 1921
892 -6:00 Louisville C%sT 1942
893 -6:00 US C%sT 1946
894 -6:00 Louisville C%sT 1961 Jul 23 2:00
895 -5:00 - EST 1968
896 -5:00 US E%sT 1974 Jan 6 2:00
897 -6:00 1:00 CDT 1974 Oct 27 2:00
898 -5:00 US E%sT
899 #
900 # Wayne County, Kentucky
901 #
902 # From
903 # <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml">
904 # Lake Cumberland LIFE
905 # </a> (1999-01-29) via WKYM-101.7:
906 # Clinton County has joined Wayne County in asking the DoT to change from
907 # the Central to the Eastern time zone.... The Wayne County government made
908 # the same request in December. And while Russell County officials have not
909 # taken action, the majority of respondents to a poll conducted there in
910 # August indicated they would like to change to "fast time" also.
911 # The three Lake Cumberland counties are the farthest east of any U.S.
912 # location in the Central time zone.
913 #
914 # From Rich Wales (2000-08-29):
915 # After prolonged debate, and despite continuing deep differences of opinion,
916 # Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
917 # (-0500) time. They won't "fall back" this year. See Sara Shipley,
918 # The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
919 #
920 # From Paul Eggert (2001-07-16):
921 # The final rule was published in the
922 # <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22">
923 # Federal Register 65, 160 (2000-08-17), page 50154-50158.
924 # </a>
925 #
926 Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
927 -6:00 US C%sT 1946
928 -6:00 - CST 1968
929 -6:00 US C%sT 2000 Oct 29 2:00
930 -5:00 US E%sT
931
932
933 # From Rives McDow (2000-08-30):
934 # Here ... are all the changes in the US since 1985.
935 # Kearny County, KS (put all of county on central;
936 # previously split between MST and CST) ... 1990-10
937 # Starke County, IN (from CST to EST) ... 1991-10
938 # Oliver County, ND (from MST to CST) ... 1992-10
939 # West Wendover, NV (from PST TO MST) ... 1999-10
940 # Wayne County, KY (from CST to EST) ... 2000-10
941 #
942 # From Paul Eggert (2001-07-17):
943 # We don't know where the line used to be within Kearny County, KS,
944 # so omit that change for now.
945 # See America/Indiana/Knox for the Starke County, IN change.
946 # See America/North_Dakota/Center for the Oliver County, ND change.
947 # West Wendover, NV officially switched from Pacific to mountain time on
948 # 1999-10-31. See the
949 # <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15">
950 # Federal Register 64, 203 (1999-10-21), page 56705-56707.
951 # </a>
952 # However, the Federal Register says that West Wendover already operated
953 # on mountain time, and the rule merely made this official;
954 # hence a separate tz entry is not needed.
955
956 # Michigan
957 #
958 # From Bob Devine (1988-01-28):
959 # Michigan didn't observe DST from 1968 to 1973.
960 #
961 # From Paul Eggert (1999-03-31):
962 # Shanks writes that Michigan started using standard time on 1885-09-18,
963 # but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
964 # that Detroit kept
965 #
966 # local time until 1900 when the City Council decreed that clocks should
967 # be put back twenty-eight minutes to Central Standard Time. Half the
968 # city obeyed, half refused. After considerable debate, the decision
969 # was rescinded and the city reverted to Sun time. A derisive offer to
970 # erect a sundial in front of the city hall was referred to the
971 # Committee on Sewers. Then, in 1905, Central time was adopted
972 # by city vote.
973 #
974 # This story is too entertaining to be false, so go with Howse over Shanks.
975 #
976 # From Paul Eggert (2001-03-06):
977 # Garland (1927) writes "Cleveland and Detroit advanced their clocks
978 # one hour in 1914." This change is not in Shanks. We have no more
979 # info, so omit this for now.
980 #
981 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
982 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
983 Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
984 Rule Detroit 1948 only - Sep lastSun 2:00 0 S
985 Rule Detroit 1967 only - Jun 14 2:00 1:00 D
986 Rule Detroit 1967 only - Oct lastSun 2:00 0 S
987 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
988 Zone America/Detroit -5:32:11 - LMT 1905
989 -6:00 - CST 1915 May 15 2:00
990 -5:00 - EST 1942
991 -5:00 US E%sT 1946
992 -5:00 Detroit E%sT 1973
993 -5:00 US E%sT 1975
994 -5:00 - EST 1975 Apr 27 2:00
995 -5:00 US E%sT
996 #
997 # Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
998 # switched from EST to CST/CDT in 1973.
999 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
1000 Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
1001 Rule Menominee 1946 only - Sep lastSun 2:00 0 S
1002 Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
1003 Rule Menominee 1966 only - Oct lastSun 2:00 0 S
1004 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1005 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
1006 -6:00 US C%sT 1946
1007 -6:00 Menominee C%sT 1969 Apr 27 2:00
1008 -5:00 - EST 1973 Apr 29 2:00
1009 -6:00 US C%sT
1010
1011 # Navassa
1012 # administered by the US Fish and Wildlife Service
1013 # claimed by US under the provisions of the 1856 Guano Islands Act
1014 # also claimed by Haiti
1015 # occupied 1857/1900 by the Navassa Phosphate Co
1016 # US lighthouse 1917/1996-09
1017 # currently uninhabited
1018 # see Mark Fineman, "An Isle Rich in Guano and Discord",
1019 # _Los Angeles Times_ (1998-11-10), A1, A10; it cites
1020 # Jimmy Skaggs, _The Great Guano Rush_ (1994).
1021
1022 ################################################################################
1023
1024
1025 # From Paul Eggert (2006-03-22):
1026 # A good source for time zone historical data outside the U.S. is
1027 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
1028 # San Diego: ACS Publications, Inc. (2003).
1029 #
1030 # Gwillim Law writes that a good source
1031 # for recent time zone data is the International Air Transport
1032 # Association's Standard Schedules Information Manual (IATA SSIM),
1033 # published semiannually. Law sent in several helpful summaries
1034 # of the IATA's data after 1990.
1035 #
1036 # Except where otherwise noted, Shanks & Pottenger is the source for
1037 # entries through 1990, and IATA SSIM is the source for entries afterwards.
1038 #
1039 # Other sources occasionally used include:
1040 #
1041 # Edward W. Whitman, World Time Differences,
1042 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
1043 # which I found in the UCLA library.
1044 #
1045 # <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf">
1046 # William Willett, The Waste of Daylight, 19th edition
1047 # </a> (1914-03)
1048 #
1049 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
1050 # <http://www.jstor.org/stable/1774359>.
1051 #
1052 # See the 'europe' file for Greenland.
1053
1054 # Canada
1055
1056 # From Alain LaBont<e'> (1994-11-14):
1057 # I post here the time zone abbreviations standardized in Canada
1058 # for both English and French in the CAN/CSA-Z234.4-89 standard....
1059 #
1060 # UTC Standard time Daylight savings time
1061 # offset French English French English
1062 # -2:30 - - HAT NDT
1063 # -3 - - HAA ADT
1064 # -3:30 HNT NST - -
1065 # -4 HNA AST HAE EDT
1066 # -5 HNE EST HAC CDT
1067 # -6 HNC CST HAR MDT
1068 # -7 HNR MST HAP PDT
1069 # -8 HNP PST HAY YDT
1070 # -9 HNY YST - -
1071 #
1072 # HN: Heure Normale ST: Standard Time
1073 # HA: Heure Avanc<e'>e DT: Daylight saving Time
1074 #
1075 # A: de l'Atlantique Atlantic
1076 # C: du Centre Central
1077 # E: de l'Est Eastern
1078 # M: Mountain
1079 # N: Newfoundland
1080 # P: du Pacifique Pacific
1081 # R: des Rocheuses
1082 # T: de Terre-Neuve
1083 # Y: du Yukon Yukon
1084 #
1085 # From Paul Eggert (1994-11-22):
1086 # Alas, this sort of thing must be handled by localization software.
1087
1088 # Unless otherwise specified, the data for Canada are all from Shanks
1089 # & Pottenger.
1090
1091 # From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
1092 # 2007-03-01):
1093 # The British Columbia government announced yesterday that it will
1094 # adjust daylight savings next year to align with changes in the
1095 # U.S. and the rest of Canada....
1096 # http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
1097 # ...
1098 # Nova Scotia
1099 # Daylight saving time will be extended by four weeks starting in 2007....
1100 # http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf
1101 #
1102 # [For New Brunswick] the new legislation dictates that the time change is to
1103 # be done at 02:00 instead of 00:01.
1104 # http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
1105 # ...
1106 # Manitoba has traditionally changed the clock every fall at 03:00.
1107 # As of 2006, the transition is to take place one hour earlier at 02:00.
1108 # http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
1109 # ...
1110 # [Alberta, Ontario, Quebec] will follow US rules.
1111 # http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
1112 # http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
1113 # http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
1114 # ...
1115 # P.E.I. will follow US rules....
1116 # http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
1117 # ...
1118 # Province of Newfoundland and Labrador....
1119 # http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
1120 # ...
1121 # Yukon
1122 # http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
1123 # ...
1124 # N.W.T. will follow US rules. Whoever maintains the government web site
1125 # does not seem to believe in bookmarks. To see the news release, click the
1126 # following link and search for "Daylight Savings Time Change". Press the
1127 # "Daylight Savings Time Change" link; it will fire off a popup using
1128 # JavaScript.
1129 # http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
1130 # ...
1131 # Nunavut
1132 # An amendment to the Interpretation Act was registered on February 19/2007....
1133 # http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
1134
1135 # From Paul Eggert (2006-04-25):
1136 # H. David Matthews and Mary Vincent's map
1137 # <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp">
1138 # "It's about TIME", _Canadian Geographic_ (September-October 1998)
1139 # </a> contains detailed boundaries for regions observing nonstandard
1140 # time and daylight saving time arrangements in Canada circa 1998.
1141 #
1142 # INMS, the Institute for National Measurement Standards in Ottawa, has <a
1143 # href="http://inms-ienm.nrc-cnrc.gc.ca/en/time_services/daylight_saving_e.php">
1144 # information about standard and daylight saving time zones in Canada.
1145 # </a> (updated periodically).
1146 # Its unofficial information is often taken from Matthews and Vincent.
1147
1148 # From Paul Eggert (2006-06-27):
1149 # For now, assume all of DST-observing Canada will fall into line with the
1150 # new US DST rules,
1151
1152 # From Chris Walton (2011-12-01)
1153 # In the first of Tammy Hardwick's articles
1154 # <a href="http://www.ilovecreston.com/?p=articles&t=spec&ar=260">
1155 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1156 # </a>
1157 # she quotes the Friday November 1/1918 edition of the Creston Review.
1158 # The quote includes these two statements:
1159 # 'Sunday the CPR went back to the old system of time...'
1160 # '... The daylight saving scheme was dropped all over Canada at the same time,'
1161 # These statements refer to a transition from daylight time to standard time
1162 # that occurred nationally on Sunday October 27/1918. This transition was
1163 # also documented in the Saturday October 26/1918 edition of the Toronto Star.
1164
1165 # In light of that evidence, we alter the date from the earlier believed
1166 # Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day
1167 # than Thursday) in all Canadian rulesets.
1168
1169 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1170 Rule Canada 1918 only - Apr 14 2:00 1:00 D
1171 Rule Canada 1918 only - Oct 27 2:00 0 S
1172 Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
1173 Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
1174 Rule Canada 1945 only - Sep 30 2:00 0 S
1175 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
1176 Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
1177 Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D
1178 Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D
1179 Rule Canada 2007 max - Nov Sun>=1 2:00 0 S
1180
1181
1182 # Newfoundland and Labrador
1183
1184 # From Paul Eggert (2000-10-02):
1185 # Matthews and Vincent (1998) write that Labrador should use NST/NDT,
1186 # but the only part of Labrador that follows the rules is the
1187 # southeast corner, including Port Hope Simpson and Mary's Harbour,
1188 # but excluding, say, Black Tickle.
1189
1190 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1191 Rule StJohns 1917 only - Apr 8 2:00 1:00 D
1192 Rule StJohns 1917 only - Sep 17 2:00 0 S
1193 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
1194 Rule StJohns 1919 only - May 5 23:00 1:00 D
1195 Rule StJohns 1919 only - Aug 12 23:00 0 S
1196 # For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
1197 Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
1198 Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
1199 # For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
1200 # Pottenger.
1201 Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
1202 Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
1203 # Whitman gives the following transitions:
1204 # 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
1205 # but go with Shanks & Pottenger and assume they used Canadian rules.
1206 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
1207 # Apr 30 - Sep 24; go with Shanks & Pottenger.
1208 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
1209 Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
1210 Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
1211 Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
1212 Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
1213 # From Paul Eggert (2000-10-02):
1214 # INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
1215 # at 00:01 local time. For now, assume it started in 1987.
1216
1217 # From Michael Pelley (2011-09-12):
1218 # We received today, Monday, September 12, 2011, notification that the
1219 # changes to the Newfoundland Standard Time Act have been proclaimed.
1220 # The change in the Act stipulates that the change from Daylight Savings
1221 # Time to Standard Time and from Standard Time to Daylight Savings Time
1222 # now occurs at 2:00AM.
1223 # ...
1224 # <a href="http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm">
1225 # http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm
1226 # </a>
1227 # ...
1228 # MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery
1229 # Office of the Chief Information Officer
1230 # Executive Council
1231 # Government of Newfoundland & Labrador
1232
1233 Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
1234 Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S
1235 Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
1236 Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D
1237 Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D
1238 Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S
1239 #
1240 # St John's has an apostrophe, but Posix file names can't have apostrophes.
1241 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1242 Zone America/St_Johns -3:30:52 - LMT 1884
1243 -3:30:52 StJohns N%sT 1918
1244 -3:30:52 Canada N%sT 1919
1245 -3:30:52 StJohns N%sT 1935 Mar 30
1246 -3:30 StJohns N%sT 1942 May 11
1247 -3:30 Canada N%sT 1946
1248 -3:30 StJohns N%sT 2011 Nov
1249 -3:30 Canada N%sT
1250
1251 # most of east Labrador
1252
1253 # The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'.
1254 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1255 Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
1256 -3:30:52 - NST 1918
1257 -3:30:52 Canada N%sT 1919
1258 -3:30:52 - NST 1935 Mar 30
1259 -3:30 - NST 1936
1260 -3:30 StJohns N%sT 1942 May 11
1261 -3:30 Canada N%sT 1946
1262 -3:30 StJohns N%sT 1966 Mar 15 2:00
1263 -4:00 StJohns A%sT 2011 Nov
1264 -4:00 Canada A%sT
1265
1266
1267 # west Labrador, Nova Scotia, Prince Edward I
1268
1269 # From Paul Eggert (2006-03-22):
1270 # Shanks & Pottenger write that since 1970 most of this region has been like
1271 # Halifax. Many locales did not observe peacetime DST until 1972;
1272 # Glace Bay, NS is the largest that we know of.
1273 # Shanks & Pottenger also write that Liverpool, NS was the only town
1274 # in Canada to observe DST in 1971 but not 1970; for now we'll assume
1275 # this is a typo.
1276
1277 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1278 Rule Halifax 1916 only - Apr 1 0:00 1:00 D
1279 Rule Halifax 1916 only - Oct 1 0:00 0 S
1280 Rule Halifax 1920 only - May 9 0:00 1:00 D
1281 Rule Halifax 1920 only - Aug 29 0:00 0 S
1282 Rule Halifax 1921 only - May 6 0:00 1:00 D
1283 Rule Halifax 1921 1922 - Sep 5 0:00 0 S
1284 Rule Halifax 1922 only - Apr 30 0:00 1:00 D
1285 Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
1286 Rule Halifax 1923 only - Sep 4 0:00 0 S
1287 Rule Halifax 1924 only - Sep 15 0:00 0 S
1288 Rule Halifax 1925 only - Sep 28 0:00 0 S
1289 Rule Halifax 1926 only - May 16 0:00 1:00 D
1290 Rule Halifax 1926 only - Sep 13 0:00 0 S
1291 Rule Halifax 1927 only - May 1 0:00 1:00 D
1292 Rule Halifax 1927 only - Sep 26 0:00 0 S
1293 Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
1294 Rule Halifax 1928 only - Sep 9 0:00 0 S
1295 Rule Halifax 1929 only - Sep 3 0:00 0 S
1296 Rule Halifax 1930 only - Sep 15 0:00 0 S
1297 Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
1298 Rule Halifax 1932 only - May 1 0:00 1:00 D
1299 Rule Halifax 1933 only - Apr 30 0:00 1:00 D
1300 Rule Halifax 1933 only - Oct 2 0:00 0 S
1301 Rule Halifax 1934 only - May 20 0:00 1:00 D
1302 Rule Halifax 1934 only - Sep 16 0:00 0 S
1303 Rule Halifax 1935 only - Jun 2 0:00 1:00 D
1304 Rule Halifax 1935 only - Sep 30 0:00 0 S
1305 Rule Halifax 1936 only - Jun 1 0:00 1:00 D
1306 Rule Halifax 1936 only - Sep 14 0:00 0 S
1307 Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
1308 Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
1309 Rule Halifax 1939 only - May 28 0:00 1:00 D
1310 Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
1311 Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D
1312 Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S
1313 Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D
1314 Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S
1315 Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D
1316 Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S
1317 Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D
1318 Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S
1319 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1320 Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
1321 -4:00 Halifax A%sT 1918
1322 -4:00 Canada A%sT 1919
1323 -4:00 Halifax A%sT 1942 Feb 9 2:00s
1324 -4:00 Canada A%sT 1946
1325 -4:00 Halifax A%sT 1974
1326 -4:00 Canada A%sT
1327 Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
1328 -4:00 Canada A%sT 1953
1329 -4:00 Halifax A%sT 1954
1330 -4:00 - AST 1972
1331 -4:00 Halifax A%sT 1974
1332 -4:00 Canada A%sT
1333
1334 # New Brunswick
1335
1336 # From Paul Eggert (2007-01-31):
1337 # The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf>
1338 # says they changed at 00:01 through 2006, and
1339 # <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it
1340 # clear that this was the case since at least 1993.
1341 # For now, assume it started in 1993.
1342
1343 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1344 Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D
1345 Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S
1346 Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D
1347 Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S
1348 Rule Moncton 1939 only - May 27 1:00 1:00 D
1349 Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S
1350 Rule Moncton 1940 only - May 19 1:00 1:00 D
1351 Rule Moncton 1941 only - May 4 1:00 1:00 D
1352 Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D
1353 Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S
1354 Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S
1355 Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D
1356 Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S
1357 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1358 Zone America/Moncton -4:19:08 - LMT 1883 Dec 9
1359 -5:00 - EST 1902 Jun 15
1360 -4:00 Canada A%sT 1933
1361 -4:00 Moncton A%sT 1942
1362 -4:00 Canada A%sT 1946
1363 -4:00 Moncton A%sT 1973
1364 -4:00 Canada A%sT 1993
1365 -4:00 Moncton A%sT 2007
1366 -4:00 Canada A%sT
1367
1368 # Quebec
1369
1370 # From Paul Eggert (2013-08-30):
1371 # Since 1970 most of Quebec has been like Toronto.
1372 # However, because earlier versions of the tz database mistakenly relied on data
1373 # from Shanks & Pottenger saying that Quebec differed from Ontario after 1970,
1374 # a separate entry was created for most of Quebec. We're loath to lose
1375 # its pre-1970 info, even though the tz database is normally limited to
1376 # zones that differ after 1970, so keep this otherwise out-of-scope entry.
1377
1378 # Matthews and Vincent (1998) also write that Quebec east of the -63
1379 # meridian is supposed to observe AST, but residents as far east as
1380 # Natashquan use EST/EDT, and residents east of Natashquan use AST.
1381 # The Quebec department of justice writes in
1382 # "The situation in Minganie and Basse-Cote-Nord"
1383 # http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm
1384 # that the coastal strip from just east of Natashquan to Blanc-Sablon
1385 # observes Atlantic standard time all year round.
1386 # http://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en
1387 # says this common practice was codified into law as of 2007.
1388 # For lack of better info, guess this practice began around 1970, contra to
1389 # Shanks & Pottenger who have this region observing AST/ADT.
1390 # for post-1970 data America/Puerto_Rico.
1391
1392 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1393 Rule Mont 1917 only - Mar 25 2:00 1:00 D
1394 Rule Mont 1917 only - Apr 24 0:00 0 S
1395 Rule Mont 1919 only - Mar 31 2:30 1:00 D
1396 Rule Mont 1919 only - Oct 25 2:30 0 S
1397 Rule Mont 1920 only - May 2 2:30 1:00 D
1398 Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
1399 Rule Mont 1921 only - May 1 2:00 1:00 D
1400 Rule Mont 1922 only - Apr 30 2:00 1:00 D
1401 Rule Mont 1924 only - May 17 2:00 1:00 D
1402 Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
1403 Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
1404 # The 1927-to-1937 rules can be expressed more simply as
1405 # Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D
1406 # Rule Mont 1927 1937 - Sep lastSat 24:00 0 S
1407 # The rules below avoid use of 24:00
1408 # (which pre-1998 versions of zic cannot handle).
1409 Rule Mont 1927 only - May 1 0:00 1:00 D
1410 Rule Mont 1927 1932 - Sep lastSun 0:00 0 S
1411 Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D
1412 Rule Mont 1932 only - May 1 0:00 1:00 D
1413 Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D
1414 Rule Mont 1933 only - Oct 1 0:00 0 S
1415 Rule Mont 1934 1939 - Sep lastSun 0:00 0 S
1416 Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D
1417 Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
1418 Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
1419 Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
1420 Rule Mont 1957 1973 - Oct lastSun 2:00 0 S
1421
1422 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1423 Zone America/Blanc-Sablon -3:48:28 - LMT 1884
1424 -4:00 Canada A%sT 1970
1425 -4:00 - AST
1426 Zone America/Montreal -4:54:16 - LMT 1884
1427 -5:00 Mont E%sT 1918
1428 -5:00 Canada E%sT 1919
1429 -5:00 Mont E%sT 1942 Feb 9 2:00s
1430 -5:00 Canada E%sT 1946
1431 -5:00 Mont E%sT 1974
1432 -5:00 Canada E%sT
1433
1434 # Ontario
1435
1436 # From Paul Eggert (2006-07-09):
1437 # Shanks & Pottenger write that since 1970 most of Ontario has been like
1438 # Toronto.
1439 # Thunder Bay skipped DST in 1973.
1440 # Many smaller locales did not observe peacetime DST until 1974;
1441 # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1442 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
1443
1444 # From Mark Brader (2003-07-26):
1445 # [According to the Toronto Star] Orillia, Ontario, adopted DST
1446 # effective Saturday, 1912-06-22, 22:00; the article mentions that
1447 # Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
1448 # have already done so. In Orillia DST was to run until Saturday,
1449 # 1912-08-31 (no time mentioned), but it was met with considerable
1450 # hostility from certain segments of the public, and was revoked after
1451 # only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but
1452 # presumably that should be -07-06. (1912-06-19, -07-12; also letters
1453 # earlier in June).
1454 #
1455 # Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
1456
1457 # From Paul Eggert (1997-10-17):
1458 # Mark Brader writes that an article in the 1997-10-14 Toronto Star
1459 # says that Atikokan, Ontario currently does not observe DST,
1460 # but will vote on 11-10 whether to use EST/EDT.
1461 # He also writes that the
1462 # <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
1463 # Ontario Time Act (1990, Chapter T.9)
1464 # </a>
1465 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
1466 # Officially Atikokan is therefore on CST/CDT, and most likely this report
1467 # concerns a non-official time observed as a matter of local practice.
1468 #
1469 # From Paul Eggert (2000-10-02):
1470 # Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
1471 # New Osnaburgh observe CST all year, that Big Trout Lake observes
1472 # CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
1473 # violation of the official Ontario rules.
1474 #
1475 # From Paul Eggert (2006-07-09):
1476 # Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
1477 # 2005-07-21 Chronicle-Journal, which said:
1478 #
1479 # The clocks in Atikokan stay set on standard time year-round.
1480 # This means they spend about half the time on central time and
1481 # the other half on eastern time.
1482 #
1483 # For the most part, the system works, Mayor Dennis Brown said.
1484 #
1485 # "The majority of businesses in Atikokan deal more with Eastern
1486 # Canada, but there are some that deal with Western Canada," he
1487 # said. "I don't see any changes happening here."
1488 #
1489 # Walton also writes "Supposedly Pickle Lake and Mishkeegogamang
1490 # [New Osnaburgh] follow the same practice."
1491
1492 # From Garry McKinnon (2006-07-14) via Chris Walton:
1493 # I chatted with a member of my board who has an outstanding memory
1494 # and a long history in Atikokan (and in the telecom industry) and he
1495 # can say for certain that Atikokan has been practicing the current
1496 # time keeping since 1952, at least.
1497
1498 # From Paul Eggert (2006-07-17):
1499 # Shanks & Pottenger say that Atikokan has agreed with Rainy River
1500 # ever since standard time was introduced, but the information from
1501 # McKinnon sounds more authoritative. For now, assume that Atikokan
1502 # switched to EST immediately after WWII era daylight saving time
1503 # ended. This matches the old (less-populous) America/Coral_Harbour
1504 # entry since our cutoff date of 1970, so we can move
1505 # America/Coral_Harbour to the 'backward' file.
1506
1507 # From Mark Brader (2010-03-06):
1508 #
1509 # Currently the database has:
1510 #
1511 # # Ontario
1512 #
1513 # # From Paul Eggert (2006-07-09):
1514 # # Shanks & Pottenger write that since 1970 most of Ontario has been like
1515 # # Toronto.
1516 # # Thunder Bay skipped DST in 1973.
1517 # # Many smaller locales did not observe peacetime DST until 1974;
1518 # # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1519 #
1520 # In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom
1521 # right corner of page 1, it says that Toronto will return to standard
1522 # time at 2 am Sunday morning (which agrees with the database), and that:
1523 #
1524 # The one-hour setback will go into effect throughout most of Ontario,
1525 # except in areas like Windsor which remains on standard time all year.
1526 #
1527 # Windsor is, of course, a lot larger than Nipigon.
1528 #
1529 # I only came across this incidentally. I don't know if Windsor began
1530 # observing DST when Detroit did, or in 1974, or on some other date.
1531 #
1532 # By the way, the article continues by noting that:
1533 #
1534 # Some cities in the United States have pushed the deadline back
1535 # three weeks and will change over from daylight saving in October.
1536
1537 # From Arthur David Olson (2010-07-17):
1538 #
1539 # "Standard Time and Time Zones in Canada" appeared in
1540 # The Journal of The Royal Astronomical Society of Canada,
1541 # volume 26, number 2 (February 1932) and, as of 2010-07-17,
1542 # was available at
1543 # <a href="http://adsabs.harvard.edu/full/1932JRASC..26...49S">
1544 # http://adsabs.harvard.edu/full/1932JRASC..26...49S
1545 # </a>
1546 #
1547 # It includes the text below (starting on page 57):
1548 #
1549 # A list of the places in Canada using daylight saving time would
1550 # require yearly revision. From information kindly furnished by
1551 # the provincial governments and by the postmasters in many cities
1552 # and towns, it is found that the following places used daylight sav-
1553 # ing in 1930. The information for the province of Quebec is definite,
1554 # for the other provinces only approximate:
1555 #
1556 # Province Daylight saving time used
1557 # Prince Edward Island Not used.
1558 # Nova Scotia In Halifax only.
1559 # New Brunswick In St. John only.
1560 # Quebec In the following places:
1561 # Montreal Lachine
1562 # Quebec Mont-Royal
1563 # Levis Iberville
1564 # St. Lambert Cap de la Madeleine
1565 # Verdun Loretteville
1566 # Westmount Richmond
1567 # Outremont St. Jerome
1568 # Longueuil Greenfield Park
1569 # Arvida Waterloo
1570 # Chambly-Canton Beaulieu
1571 # Melbourne La Tuque
1572 # St. Theophile Buckingham
1573 # Ontario Used generally in the cities and towns along
1574 # the southerly part of the province. Not
1575 # used in the northwesterlhy part.
1576 # Manitoba Not used.
1577 # Saskatchewan In Regina only.
1578 # Alberta Not used.
1579 # British Columbia Not used.
1580 #
1581 # With some exceptions, the use of daylight saving may be said to be limited
1582 # to those cities and towns lying between Quebec city and Windsor, Ont.
1583
1584 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1585 Rule Toronto 1919 only - Mar 30 23:30 1:00 D
1586 Rule Toronto 1919 only - Oct 26 0:00 0 S
1587 Rule Toronto 1920 only - May 2 2:00 1:00 D
1588 Rule Toronto 1920 only - Sep 26 0:00 0 S
1589 Rule Toronto 1921 only - May 15 2:00 1:00 D
1590 Rule Toronto 1921 only - Sep 15 2:00 0 S
1591 Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
1592 # Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
1593 # was meant.
1594 Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
1595 Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
1596 # The 1927-to-1939 rules can be expressed more simply as
1597 # Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S
1598 # Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D
1599 # Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D
1600 # Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S
1601 # The rules below avoid use of Sun>=25
1602 # (which pre-2004 versions of zic cannot handle).
1603 Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S
1604 Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D
1605 Rule Toronto 1932 only - May 1 2:00 1:00 D
1606 Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D
1607 Rule Toronto 1933 only - Oct 1 2:00 0 S
1608 Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S
1609 Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S
1610 Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D
1611 Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D
1612 Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S
1613 Rule Toronto 1949 only - Nov lastSun 0:00 0 S
1614 Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D
1615 Rule Toronto 1950 only - Nov lastSun 2:00 0 S
1616 Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S
1617 # Shanks & Pottenger say Toronto ended DST a week early in 1971,
1618 # namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this
1619 # is wrong, and that he had confirmed it by checking the 1971-10-30
1620 # Toronto Star, which said that DST was ending 1971-10-31 as usual.
1621 Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S
1622
1623 # From Paul Eggert (2003-07-27):
1624 # Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
1625 # Port Arthur, Ontario, the principle of the Bill has been in
1626 # operation for the past three years, and in the City of Moose Jaw,
1627 # Saskatchewan, for one year."
1628
1629 # From David Bryan via Tory Tronrud, Director/Curator,
1630 # Thunder Bay Museum (2003-11-12):
1631 # There is some suggestion, however, that, by-law or not, daylight
1632 # savings time was being practiced in Fort William and Port Arthur
1633 # before 1909.... [I]n 1910, the line between the Eastern and Central
1634 # Time Zones was permanently moved about two hundred miles west to
1635 # include the Thunder Bay area.... When Canada adopted daylight
1636 # savings time in 1916, Fort William and Port Arthur, having done so
1637 # already, did not change their clocks.... During the Second World
1638 # War,... [t]he cities agreed to implement DST during the summer
1639 # months for the remainder of the war years.
1640
1641 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1642 Zone America/Toronto -5:17:32 - LMT 1895
1643 -5:00 Canada E%sT 1919
1644 -5:00 Toronto E%sT 1942 Feb 9 2:00s
1645 -5:00 Canada E%sT 1946
1646 -5:00 Toronto E%sT 1974
1647 -5:00 Canada E%sT
1648 Zone America/Thunder_Bay -5:57:00 - LMT 1895
1649 -6:00 - CST 1910
1650 -5:00 - EST 1942
1651 -5:00 Canada E%sT 1970
1652 -5:00 Toronto E%sT 1973
1653 -5:00 - EST 1974
1654 -5:00 Canada E%sT
1655 Zone America/Nipigon -5:53:04 - LMT 1895
1656 -5:00 Canada E%sT 1940 Sep 29
1657 -5:00 1:00 EDT 1942 Feb 9 2:00s
1658 -5:00 Canada E%sT
1659 Zone America/Rainy_River -6:18:16 - LMT 1895
1660 -6:00 Canada C%sT 1940 Sep 29
1661 -6:00 1:00 CDT 1942 Feb 9 2:00s
1662 -6:00 Canada C%sT
1663 Zone America/Atikokan -6:06:28 - LMT 1895
1664 -6:00 Canada C%sT 1940 Sep 29
1665 -6:00 1:00 CDT 1942 Feb 9 2:00s
1666 -6:00 Canada C%sT 1945 Sep 30 2:00
1667 -5:00 - EST
1668
1669
1670 # Manitoba
1671
1672 # From Rob Douglas (2006-04-06):
1673 # the old Manitoba Time Act - as amended by Bill 2, assented to
1674 # March 27, 1987 ... said ...
1675 # "between two o'clock Central Standard Time in the morning of
1676 # the first Sunday of April of each year and two o'clock Central
1677 # Standard Time in the morning of the last Sunday of October next
1678 # following, one hour in advance of Central Standard Time."...
1679 # I believe that the English legislation [of the old time act] had =
1680 # been assented to (March 22, 1967)....
1681 # Also, as far as I can tell, there was no order-in-council varying
1682 # the time of Daylight Saving Time for 2005 and so the provisions of
1683 # the 1987 version would apply - the changeover was at 2:00 Central
1684 # Standard Time (i.e. not until 3:00 Central Daylight Time).
1685
1686 # From Paul Eggert (2006-04-10):
1687 # Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
1688 # starting 1966. Since 02:00s is clearly correct for 1967 on, assume
1689 # it was also 02:00s in 1966.
1690
1691 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1692 Rule Winn 1916 only - Apr 23 0:00 1:00 D
1693 Rule Winn 1916 only - Sep 17 0:00 0 S
1694 Rule Winn 1918 only - Apr 14 2:00 1:00 D
1695 Rule Winn 1918 only - Oct 27 2:00 0 S
1696 Rule Winn 1937 only - May 16 2:00 1:00 D
1697 Rule Winn 1937 only - Sep 26 2:00 0 S
1698 Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
1699 Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
1700 Rule Winn 1945 only - Sep lastSun 2:00 0 S
1701 Rule Winn 1946 only - May 12 2:00 1:00 D
1702 Rule Winn 1946 only - Oct 13 2:00 0 S
1703 Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
1704 Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
1705 Rule Winn 1950 only - May 1 2:00 1:00 D
1706 Rule Winn 1950 only - Sep 30 2:00 0 S
1707 Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
1708 Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
1709 Rule Winn 1959 only - Oct lastSun 2:00 0 S
1710 Rule Winn 1960 only - Sep lastSun 2:00 0 S
1711 Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
1712 Rule Winn 1963 only - Sep 22 2:00 0 S
1713 Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D
1714 Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S
1715 Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D
1716 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1717 Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
1718 -6:00 Winn C%sT 2006
1719 -6:00 Canada C%sT
1720
1721
1722 # Saskatchewan
1723
1724 # From Mark Brader (2003-07-26):
1725 # The first actual adoption of DST in Canada was at the municipal
1726 # level. As the [Toronto] Star put it (1912-06-07), "While people
1727 # elsewhere have long been talking of legislation to save daylight,
1728 # the city of Moose Jaw [Saskatchewan] has acted on its own hook."
1729 # DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
1730 # presumably late evening, as below), and would run until "the end of
1731 # the summer". The discrepancy between municipal time and railroad
1732 # time was noted.
1733
1734 # From Paul Eggert (2003-07-27):
1735 # Willett (1914-03) notes that DST "has been in operation ... in the
1736 # City of Moose Jaw, Saskatchewan, for one year."
1737
1738 # From Paul Eggert (2006-03-22):
1739 # Shanks & Pottenger say that since 1970 this region has mostly been as Regina.
1740 # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
1741 # Other western towns (e.g. Lloydminster) are like Edmonton.
1742 # Matthews and Vincent (1998) write that Denare Beach and Creighton
1743 # are like Winnipeg, in violation of Saskatchewan law.
1744
1745 # From W. Jones (1992-11-06):
1746 # The. . .below is based on information I got from our law library, the
1747 # provincial archives, and the provincial Community Services department.
1748 # A precise history would require digging through newspaper archives, and
1749 # since you didn't say what you wanted, I didn't bother.
1750 #
1751 # Saskatchewan is split by a time zone meridian (105W) and over the years
1752 # the boundary became pretty ragged as communities near it reevaluated
1753 # their affiliations in one direction or the other. In 1965 a provincial
1754 # referendum favoured legislating common time practices.
1755 #
1756 # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
1757 # Saskatchewan 1978) was proclaimed, and established that the eastern
1758 # part of Saskatchewan would use CST year round, that districts in
1759 # northwest Saskatchewan would by default follow CST but could opt to
1760 # follow Mountain Time rules (thus 1 hour difference in the winter and
1761 # zero in the summer), and that districts in southwest Saskatchewan would
1762 # by default follow MT but could opt to follow CST.
1763 #
1764 # It took a few years for the dust to settle (I know one story of a town
1765 # on one time zone having its school in another, such that a mom had to
1766 # serve her family lunch in two shifts), but presently it seems that only
1767 # a few towns on the border with Alberta (e.g. Lloydminster) follow MT
1768 # rules any more; all other districts appear to have used CST year round
1769 # since sometime in the 1960s.
1770
1771 # From Chris Walton (2006-06-26):
1772 # The Saskatchewan time act which was last updated in 1996 is about 30 pages
1773 # long and rather painful to read.
1774 # http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf
1775
1776 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1777 Rule Regina 1918 only - Apr 14 2:00 1:00 D
1778 Rule Regina 1918 only - Oct 27 2:00 0 S
1779 Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
1780 Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
1781 Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
1782 Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
1783 Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
1784 Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
1785 Rule Regina 1942 only - Feb 9 2:00 1:00 W # War
1786 Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace
1787 Rule Regina 1945 only - Sep lastSun 2:00 0 S
1788 Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
1789 Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
1790 Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D
1791 Rule Regina 1947 1957 - Sep lastSun 2:00 0 S
1792 Rule Regina 1959 only - Apr lastSun 2:00 1:00 D
1793 Rule Regina 1959 only - Oct lastSun 2:00 0 S
1794 #
1795 Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
1796 Rule Swift 1957 only - Oct lastSun 2:00 0 S
1797 Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
1798 Rule Swift 1959 only - Oct lastSun 2:00 0 S
1799 Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
1800 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1801 Zone America/Regina -6:58:36 - LMT 1905 Sep
1802 -7:00 Regina M%sT 1960 Apr lastSun 2:00
1803 -6:00 - CST
1804 Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
1805 -7:00 Canada M%sT 1946 Apr lastSun 2:00
1806 -7:00 Regina M%sT 1950
1807 -7:00 Swift M%sT 1972 Apr lastSun 2:00
1808 -6:00 - CST
1809
1810
1811 # Alberta
1812
1813 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1814 Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
1815 Rule Edm 1918 only - Oct 27 2:00 0 S
1816 Rule Edm 1919 only - May 27 2:00 0 S
1817 Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
1818 Rule Edm 1920 only - Oct lastSun 2:00 0 S
1819 Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
1820 Rule Edm 1942 only - Feb 9 2:00 1:00 W # War
1821 Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace
1822 Rule Edm 1945 only - Sep lastSun 2:00 0 S
1823 Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
1824 Rule Edm 1947 only - Sep lastSun 2:00 0 S
1825 Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
1826 Rule Edm 1967 only - Oct lastSun 2:00 0 S
1827 Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
1828 Rule Edm 1969 only - Oct lastSun 2:00 0 S
1829 Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
1830 Rule Edm 1972 2006 - Oct lastSun 2:00 0 S
1831 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1832 Zone America/Edmonton -7:33:52 - LMT 1906 Sep
1833 -7:00 Edm M%sT 1987
1834 -7:00 Canada M%sT
1835
1836
1837 # British Columbia
1838
1839 # From Paul Eggert (2006-03-22):
1840 # Shanks & Pottenger write that since 1970 most of this region has
1841 # been like Vancouver.
1842 # Dawson Creek uses MST. Much of east BC is like Edmonton.
1843 # Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1844
1845 # It seems though that (re: Creston) is not entirely correct:
1846
1847 # From Chris Walton (2011-12-01):
1848 # There are two areas within the Canadian province of British Columbia
1849 # that do not currently observe daylight saving:
1850 # a) The Creston Valley (includes the town of Creston and surrounding area)
1851 # b) The eastern half of the Peace River Regional District
1852 # (includes the cities of Dawson Creek and Fort St. John)
1853
1854 # Earlier this year I stumbled across a detailed article about the time
1855 # keeping history of Creston; it was written by Tammy Hardwick who is the
1856 # manager of the Creston & District Museum. The article was written in May 2009.
1857 # <a href="http://www.ilovecreston.com/?p=articles&t=spec&ar=260">
1858 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1859 # </a>
1860 # According to the article, Creston has not changed its clocks since June 1918.
1861 # i.e. Creston has been stuck on UTC-7 for 93 years.
1862 # Dawson Creek, on the other hand, changed its clocks as recently as April 1972.
1863
1864 # Unfortunately the exact date for the time change in June 1918 remains
1865 # unknown and will be difficult to ascertain. I e-mailed Tammy a few months
1866 # ago to ask if Sunday June 2 was a reasonable guess. She said it was just
1867 # as plausible as any other date (in June). She also said that after writing the
1868 # article she had discovered another time change in 1916; this is the subject
1869 # of another article which she wrote in October 2010.
1870 # <a href="http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56">
1871 # http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56
1872 # </a>
1873
1874 # Here is a summary of the three clock change events in Creston's history:
1875 # 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7)
1876 # Exact date unknown
1877 # 2. Oct 1916: switch to Pacific Standard Time (GMT-8)
1878 # Exact date in October unknown; Sunday October 1 is a reasonable guess.
1879 # 3. June 1918: switch to Pacific Daylight Time (GMT-7)
1880 # Exact date in June unknown; Sunday June 2 is a reasonable guess.
1881 # note#1:
1882 # On Oct 27/1918 when daylight saving ended in the rest of Canada,
1883 # Creston did not change its clocks.
1884 # note#2:
1885 # During WWII when the Federal Government legislated a mandatory clock change,
1886 # Creston did not oblige.
1887 # note#3:
1888 # There is no guarantee that Creston will remain on Mountain Standard Time
1889 # (UTC-7) forever.
1890 # The subject was debated at least once this year by the town Council.
1891 # <a href="http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html">
1892 # http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html
1893 # </a>
1894
1895 # During a period WWII, summer time (Daylight saying) was mandatory in Canada.
1896 # In Creston, that was handled by shifting the area to PST (-8:00) then applying
1897 # summer time to cause the offset to be -7:00, the same as it had been before
1898 # the change. It can be argued that the timezone abbreviation during this
1899 # period should be PDT rather than MST, but that doesn't seem important enough
1900 # (to anyone) to further complicate the rules.
1901
1902 # The transition dates (and times) are guesses.
1903
1904 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1905 Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1906 Rule Vanc 1918 only - Oct 27 2:00 0 S
1907 Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
1908 Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
1909 Rule Vanc 1945 only - Sep 30 2:00 0 S
1910 Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1911 Rule Vanc 1946 only - Oct 13 2:00 0 S
1912 Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1913 Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S
1914 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1915 Zone America/Vancouver -8:12:28 - LMT 1884
1916 -8:00 Vanc P%sT 1987
1917 -8:00 Canada P%sT
1918 Zone America/Dawson_Creek -8:00:56 - LMT 1884
1919 -8:00 Canada P%sT 1947
1920 -8:00 Vanc P%sT 1972 Aug 30 2:00
1921 -7:00 - MST
1922 Zone America/Creston -7:46:04 - LMT 1884
1923 -7:00 - MST 1916 Oct 1
1924 -8:00 - PST 1918 Jun 2
1925 -7:00 - MST
1926
1927 # Northwest Territories, Nunavut, Yukon
1928
1929 # From Paul Eggert (2006-03-22):
1930 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1931 # Mathew Englander (1996-10-07) gives the following refs:
1932 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1933 # c. 7 defines Yukon standard time as UTC-9. This is still valid;
1934 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1935 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1936 # * O.I.C. 1980/02 established DST.
1937 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1938 # Shanks & Pottenger say Yukon's 1973-10-28 switch was at 2:00; go
1939 # with Englander.
1940 # From Chris Walton (2006-06-26):
1941 # Here is a link to the old daylight saving portion of the interpretation
1942 # act which was last updated in 1987:
1943 # http://www.gov.yk.ca/legislation/regs/oic1987_056.pdf
1944
1945 # From Rives McDow (1999-09-04):
1946 # Nunavut ... moved ... to incorporate the whole territory into one time zone.
1947 # <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
1948 # Nunavut moves to single time zone Oct. 31
1949 # </a>
1950 #
1951 # From Antoine Leca (1999-09-06):
1952 # We then need to create a new timezone for the Kitikmeot region of Nunavut
1953 # to differentiate it from the Yellowknife region.
1954
1955 # From Paul Eggert (1999-09-20):
1956 # <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
1957 # Basic Facts: The New Territory
1958 # </a> (1999) reports that Pangnirtung operates on eastern time,
1959 # and that Coral Harbour does not observe DST. We don't know when
1960 # Pangnirtung switched to eastern time; we'll guess 1995.
1961
1962 # From Rives McDow (1999-11-08):
1963 # On October 31, when the rest of Nunavut went to Central time,
1964 # Pangnirtung wobbled. Here is the result of their wobble:
1965 #
1966 # The following businesses and organizations in Pangnirtung use Central Time:
1967 #
1968 # First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
1969 # Eastern Arctic National Parks, A & D Specialist
1970 #
1971 # The following businesses and organizations in Pangnirtung use Eastern Time:
1972 #
1973 # Hamlet office, All other businesses, Both schools, Airport operator
1974 #
1975 # This has made for an interesting situation there, which warranted the news.
1976 # No one there that I spoke with seems concerned, or has plans to
1977 # change the local methods of keeping time, as it evidently does not
1978 # really interfere with any activities or make things difficult locally.
1979 # They plan to celebrate New Year's turn-over twice, one hour apart,
1980 # so it appears that the situation will last at least that long.
1981 # The Nunavut Intergovernmental Affairs hopes that they will "come to
1982 # their senses", but the locals evidently don't see any problem with
1983 # the current state of affairs.
1984
1985 # From Michaela Rodrigue, writing in the
1986 # <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html">
1987 # Nunatsiaq News (1999-11-19)</a>:
1988 # Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
1989 # central - or Nunavut time - for government offices, and eastern time
1990 # for municipal offices and schools.... Igloolik [was similar but then]
1991 # made the switch to central time on Saturday, Nov. 6.
1992
1993 # From Paul Eggert (2000-10-02):
1994 # Matthews and Vincent (1998) say the following, but we lack histories
1995 # for these potential new Zones.
1996 #
1997 # The Canadian Forces station at Alert uses Eastern Time while the
1998 # handful of residents at the Eureka weather station [in the Central
1999 # zone] skip daylight savings. Baffin Island, which is crossed by the
2000 # Central, Eastern and Atlantic Time zones only uses Eastern Time.
2001 # Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
2002 # Central Time and Southampton Island [in the Central zone] is not
2003 # required to use daylight savings.
2004
2005 # From
2006 # <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html">
2007 # Nunavut now has two time zones
2008 # </a> (2000-11-10):
2009 # The Nunavut government would allow its employees in Kugluktuk and
2010 # Cambridge Bay to operate on central time year-round, putting them
2011 # one hour behind the rest of Nunavut for six months during the winter.
2012 # At the end of October the two communities had rebelled against
2013 # Nunavut's unified time zone, refusing to shift to eastern time with
2014 # the rest of the territory for the winter. Cambridge Bay remained on
2015 # central time, while Kugluktuk, even farther west, reverted to
2016 # mountain time, which they had used before the advent of Nunavut's
2017 # unified time zone in 1999.
2018 #
2019 # From Rives McDow (2001-01-20), quoting the Nunavut government:
2020 # The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
2021
2022 # From Paul Eggert (2000-12-04):
2023 # Let's just keep track of the official times for now.
2024
2025 # From Rives McDow (2001-03-07):
2026 # The premier of Nunavut has issued a ministerial statement advising
2027 # that effective 2001-04-01, the territory of Nunavut will revert
2028 # back to three time zones (mountain, central, and eastern). Of the
2029 # cities in Nunavut, Coral Harbor is the only one that I know of that
2030 # has said it will not observe dst, staying on EST year round. I'm
2031 # checking for more info, and will get back to you if I come up with
2032 # more.
2033 # [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
2034
2035 # From Gwillim Law (2005-05-21):
2036 # According to maps at
2037 # http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SWE.jpg
2038 # http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SSE.jpg
2039 # (both dated 2003), and
2040 # http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp
2041 # (from a 1998 Canadian Geographic article), the de facto and de jure time
2042 # for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year
2043 # round. Using Google, it's easy to find other websites that confirm this.
2044 # I wasn't able to find how far back this time regimen goes, but since it
2045 # predates the creation of Nunavut, it probably goes back many years....
2046 # The Inuktitut name of Coral Harbour is Sallit, but it's rarely used.
2047 #
2048 # From Paul Eggert (2005-07-26):
2049 # For lack of better information, assume that Southampton Island observed
2050 # daylight saving only during wartime.
2051
2052 # From Chris Walton (2007-03-01):
2053 # ... the community of Resolute (located on Cornwallis Island in
2054 # Nunavut) moved from Central Time to Eastern Time last November.
2055 # Basically the community did not change its clocks at the end of
2056 # daylight saving....
2057 # http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html
2058
2059 # From Chris Walton (2011-03-21):
2060 # Back in 2007 I initiated the creation of a new "zone file" for Resolute
2061 # Bay. Resolute Bay is a small community located about 900km north of
2062 # the Arctic Circle. The zone file was required because Resolute Bay had
2063 # decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007.
2064 #
2065 # According to new information which I received last week, Resolute Bay
2066 # went back to using UTC-6 in the winter of 2007-2008...
2067 #
2068 # On March 11/2007 most of Canada went onto daylight saving. On March
2069 # 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I
2070 # talked to somebody that was both knowledgeable and helpful. I was able
2071 # to confirm that Resolute Bay was still operating on UTC-5. It was
2072 # explained to me that Resolute Bay had been on the Eastern Time zone
2073 # (EST) in the winter, and was now back on the Central Time zone (CDT).
2074 # i.e. the time zone had changed twice in the last year but the clocks
2075 # had not moved. The residents had to know which time zone they were in
2076 # so they could follow the correct TV schedule...
2077 #
2078 # On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I
2079 # phoned the Resolute Bay hamlet office...[D]ue to the challenging nature
2080 # of the phone call, I decided to seek out an alternate source of
2081 # information. I found an e-mail address for somebody by the name of
2082 # Stephanie Adams whose job was listed as "Inns North Support Officer for
2083 # Arctic Co-operatives." I was under the impression that Stephanie lived
2084 # and worked in Resolute Bay...
2085 #
2086 # On March 14/2011 I phoned the hamlet office again. I was told that
2087 # Resolute Bay had been using Central Standard Time over the winter of
2088 # 2010-2011 and that the clocks had therefore been moved one hour ahead
2089 # on March 13/2011. The person I talked to was aware that Resolute Bay
2090 # had previously experimented with Eastern Standard Time but he could not
2091 # tell me when the practice had stopped.
2092 #
2093 # On March 17/2011 I searched the Web to find an e-mail address of
2094 # somebody that might be able to tell me exactly when Resolute Bay went
2095 # off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz
2096 # used to be the mayor of Resolute Bay and he apparently owns half the
2097 # businesses including "South Camp Inn." This website has some info on
2098 # Aziz:
2099 # <a href="http://www.uphere.ca/node/493">
2100 # http://www.uphere.ca/node/493
2101 # </a>
2102 #
2103 # I sent Aziz an e-mail asking when Resolute Bay had stopped using
2104 # Eastern Standard Time.
2105 #
2106 # Aziz responded quickly with this: "hi, The time was not changed for the
2107 # 1 year only, the following year, the community went back to the old way
2108 # of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in
2109 # the winter Zulu plus 6 hrs"
2110 #
2111 # This of course conflicted with everything I had ascertained in November 2008.
2112 #
2113 # I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz
2114 # responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You
2115 # may want to check with the weather office in Resolute Bay or do a
2116 # search on the weather through Env. Canada. web site"
2117 #
2118 # If I had realized the Stephanie did not live in Resolute Bay I would
2119 # never have contacted her. I now believe that all the information I
2120 # obtained in November 2008 should be ignored...
2121 # I apologize for reporting incorrect information in 2008.
2122
2123 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2124 Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
2125 Rule NT_YK 1918 only - Oct 27 2:00 0 S
2126 Rule NT_YK 1919 only - May 25 2:00 1:00 D
2127 Rule NT_YK 1919 only - Nov 1 0:00 0 S
2128 Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War
2129 Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace
2130 Rule NT_YK 1945 only - Sep 30 2:00 0 S
2131 Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
2132 Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
2133 Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
2134 Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S
2135 Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D
2136 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2137 # aka Panniqtuuq
2138 Zone America/Pangnirtung 0 - zzz 1921 # trading post est.
2139 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
2140 -5:00 Canada 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 # formerly Frobisher Bay
2144 Zone America/Iqaluit 0 - zzz 1942 Aug # Frobisher Bay est.
2145 -5:00 NT_YK E%sT 1999 Oct 31 2:00
2146 -6:00 Canada C%sT 2000 Oct 29 2:00
2147 -5:00 Canada E%sT
2148 # aka Qausuittuq
2149 Zone America/Resolute 0 - zzz 1947 Aug 31 # Resolute founded
2150 -6:00 NT_YK C%sT 2000 Oct 29 2:00
2151 -5:00 - EST 2001 Apr 1 3:00
2152 -6:00 Canada C%sT 2006 Oct 29 2:00
2153 -5:00 - EST 2007 Mar 11 3:00
2154 -6:00 Canada C%sT
2155 # aka Kangiqiniq
2156 Zone America/Rankin_Inlet 0 - zzz 1957 # Rankin Inlet founded
2157 -6:00 NT_YK C%sT 2000 Oct 29 2:00
2158 -5:00 - EST 2001 Apr 1 3:00
2159 -6:00 Canada C%sT
2160 # aka Iqaluktuuttiaq
2161 Zone America/Cambridge_Bay 0 - zzz 1920 # trading post est.?
2162 -7:00 NT_YK M%sT 1999 Oct 31 2:00
2163 -6:00 Canada C%sT 2000 Oct 29 2:00
2164 -5:00 - EST 2000 Nov 5 0:00
2165 -6:00 - CST 2001 Apr 1 3:00
2166 -7:00 Canada M%sT
2167 Zone America/Yellowknife 0 - zzz 1935 # Yellowknife founded?
2168 -7:00 NT_YK M%sT 1980
2169 -7:00 Canada M%sT
2170 Zone America/Inuvik 0 - zzz 1953 # Inuvik founded
2171 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
2172 -7:00 NT_YK M%sT 1980
2173 -7:00 Canada M%sT
2174 Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
2175 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
2176 -8:00 NT_YK P%sT 1980
2177 -8:00 Canada P%sT
2178 Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
2179 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
2180 -8:00 NT_YK P%sT 1980
2181 -8:00 Canada P%sT
2182
2183
2184 ###############################################################################
2185
2186 # Mexico
2187
2188 # From Paul Eggert (2001-03-05):
2189 # The Investigation and Analysis Service of the
2190 # Mexican Library of Congress (MLoC) has published a
2191 # <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/">
2192 # history of Mexican local time (in Spanish)
2193 # </a>.
2194 #
2195 # Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
2196 # (In all cases we go with the MLoC.)
2197 # S&P report that Baja was at -8:00 in 1922/1923.
2198 # S&P say the 1930 transition in Baja was 1930-11-16.
2199 # S&P report no DST during summer 1931.
2200 # S&P report a transition at 1932-03-30 23:00, not 1932-04-01.
2201
2202 # From Gwillim Law (2001-02-20):
2203 # There are some other discrepancies between the Decrees page and the
2204 # tz database. I think they can best be explained by supposing that
2205 # the researchers who prepared the Decrees page failed to find some of
2206 # the relevant documents.
2207
2208 # From Alan Perry (1996-02-15):
2209 # A guy from our Mexico subsidiary finally found the Presidential Decree
2210 # outlining the timezone changes in Mexico.
2211 #
2212 # ------------- Begin Forwarded Message -------------
2213 #
2214 # I finally got my hands on the Official Presidential Decree that sets up the
2215 # rules for the DST changes. The rules are:
2216 #
2217 # 1. The country is divided in 3 timezones:
2218 # - Baja California Norte (the Mexico/BajaNorte TZ)
2219 # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
2220 # - The rest of the country (the Mexico/General TZ)
2221 #
2222 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
2223 # at 2:00 AM, the times in each zone are as follows:
2224 # BajaNorte: GMT+7
2225 # BajaSur: GMT+6
2226 # General: GMT+5
2227 #
2228 # 3. The rest of the year, the times are as follows:
2229 # BajaNorte: GMT+8
2230 # BajaSur: GMT+7
2231 # General: GMT+6
2232 #
2233 # The Decree was published in Mexico's Official Newspaper on January 4th.
2234 #
2235 # -------------- End Forwarded Message --------------
2236 # From Paul Eggert (1996-06-12):
2237 # For an English translation of the decree, see
2238 # <a href="http://mexico-travel.com/extra/timezone_eng.html">
2239 # "Diario Oficial: Time Zone Changeover" (1996-01-04).
2240 # </a>
2241
2242 # From Rives McDow (1998-10-08):
2243 # The State of Quintana Roo has reverted back to central STD and DST times
2244 # (i.e. UTC -0600 and -0500 as of 1998-08-02).
2245
2246 # From Rives McDow (2000-01-10):
2247 # Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
2248 # zone 5 hours from the International Date Line, and will not observe daylight
2249 # savings time so as to stay on the same time zone as the southern part of
2250 # Arizona year round.
2251
2252 # From Jesper Norgaard, translating
2253 # <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
2254 # In Oaxaca, the 55.000 teachers from the Section 22 of the National
2255 # Syndicate of Education Workers, refuse to apply daylight saving each
2256 # year, so that the more than 10,000 schools work at normal hour the
2257 # whole year.
2258
2259 # From Gwillim Law (2001-01-19):
2260 # <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
2261 # (translated):...
2262 # January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
2263 # that Summer Time will be reduced from seven to five months, starting
2264 # this year....
2265 # <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001>
2266 # [translated], says "summer time will ... take effect on the first Sunday
2267 # in May, and end on the last Sunday of September.
2268
2269 # From Arthur David Olson (2001-01-25):
2270 # The 2001-01-24 traditional Washington Post contained the page one
2271 # story "Timely Issue Divides Mexicans."...
2272 # http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
2273 # ... Mexico City Mayor Lopez Obrador "...is threatening to keep
2274 # Mexico City and its 20 million residents on a different time than
2275 # the rest of the country..." In particular, Lopez Obrador would abolish
2276 # observation of Daylight Saving Time.
2277
2278 # <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre">
2279 # Official statute published by the Energy Department
2280 # </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
2281 # and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03).
2282
2283 # From Paul Eggert (2001-03-03):
2284 #
2285 # <a href="http://www.latimes.com/news/nation/20010303/t000018766.html">
2286 # James F. Smith writes in today's LA Times
2287 # </a>
2288 # * Sonora will continue to observe standard time.
2289 # * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that
2290 # the Federal District will not adopt DST.
2291 # * 4 of 16 district leaders announced they'll ignore the decree.
2292 # * The decree does not affect federal-controlled facilities including
2293 # the airport, banks, hospitals, and schools.
2294 #
2295 # For now we'll assume that the Federal District will bow to federal rules.
2296
2297 # From Jesper Norgaard (2001-04-01):
2298 # I found some references to the Mexican application of daylight
2299 # saving, which modifies what I had already sent you, stating earlier
2300 # that a number of northern Mexican states would go on daylight
2301 # saving. The modification reverts this to only cover Baja California
2302 # (Norte), while all other states (except Sonora, who has no daylight
2303 # saving all year) will follow the original decree of president
2304 # Vicente Fox, starting daylight saving May 6, 2001 and ending
2305 # September 30, 2001.
2306 # References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp>
2307 # Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
2308
2309 # From Reuters (2001-09-04):
2310 # Mexico's Supreme Court on Tuesday declared that daylight savings was
2311 # unconstitutional in Mexico City, creating the possibility the
2312 # capital will be in a different time zone from the rest of the nation
2313 # next year.... The Supreme Court's ruling takes effect at 2:00
2314 # a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
2315 # standard time. "This is so residents of the Federal District are not
2316 # subject to unexpected time changes," a statement from the court said.
2317
2318 # From Jesper Norgaard Welen (2002-03-12):
2319 # ... consulting my local grocery store(!) and my coworkers, they all insisted
2320 # that a new decision had been made to reinstate US style DST in Mexico....
2321 # http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
2322 # confirms this. Sonora as usual is the only state where DST is not applied.
2323
2324 # From Steffen Thorsen (2009-12-28):
2325 #
2326 # Steffen Thorsen wrote:
2327 # > Mexico's House of Representatives has approved a proposal for northern
2328 # > Mexico's border cities to share the same daylight saving schedule as
2329 # > the United States.
2330 # Now this has passed both the Congress and the Senate, so starting from
2331 # 2010, some border regions will be the same:
2332 # <a href="http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/">
2333 # http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/
2334 # </a>
2335 # <a href="http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939">
2336 # http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939
2337 # </a>
2338 # (Spanish)
2339 #
2340 # Could not find the new law text, but the proposed law text changes are here:
2341 # <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf">
2342 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf
2343 # </a>
2344 # (Gaceta Parlamentaria)
2345 #
2346 # There is also a list of the votes here:
2347 # <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html">
2348 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html
2349 # </a>
2350 #
2351 # Our page:
2352 # <a href="http://www.timeanddate.com/news/time/north-mexico-dst-change.html">
2353 # http://www.timeanddate.com/news/time/north-mexico-dst-change.html
2354 # </a>
2355
2356 # From Arthur David Olson (2010-01-20):
2357 # The page
2358 # <a href="http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010">
2359 # http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
2360 # </a>
2361 # includes this text:
2362 # En los municipios fronterizos de Tijuana y Mexicali en Baja California;
2363 # Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila;
2364 # Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en
2365 # Tamaulipas, la aplicación de este horario estacional surtirá efecto
2366 # desde las dos horas del segundo domingo de marzo y concluirá a las dos
2367 # horas del primer domingo de noviembre.
2368 # En los municipios fronterizos que se encuentren ubicados en la franja
2369 # fronteriza norte en el territorio comprendido entre la línea
2370 # internacional y la línea paralela ubicada a una distancia de veinte
2371 # kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el
2372 # interior del país, la aplicación de este horario estacional surtirá
2373 # efecto desde las dos horas del segundo domingo de marzo y concluirá a
2374 # las dos horas del primer domingo de noviembre.
2375
2376 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2377 Rule Mexico 1939 only - Feb 5 0:00 1:00 D
2378 Rule Mexico 1939 only - Jun 25 0:00 0 S
2379 Rule Mexico 1940 only - Dec 9 0:00 1:00 D
2380 Rule Mexico 1941 only - Apr 1 0:00 0 S
2381 Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
2382 Rule Mexico 1944 only - May 1 0:00 0 S
2383 Rule Mexico 1950 only - Feb 12 0:00 1:00 D
2384 Rule Mexico 1950 only - Jul 30 0:00 0 S
2385 Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
2386 Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
2387 Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
2388 Rule Mexico 2001 only - Sep lastSun 2:00 0 S
2389 Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
2390 Rule Mexico 2002 max - Oct lastSun 2:00 0 S
2391 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2392 # Quintana Roo
2393 Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
2394 -6:00 - CST 1981 Dec 23
2395 -5:00 Mexico E%sT 1998 Aug 2 2:00
2396 -6:00 Mexico C%sT
2397 # Campeche, Yucatan
2398 Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
2399 -6:00 - CST 1981 Dec 23
2400 -5:00 - EST 1982 Dec 2
2401 -6:00 Mexico C%sT
2402 # Coahuila, Durango, Nuevo Leon, Tamaulipas (near US border)
2403 Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00
2404 -6:00 - CST 1988
2405 -6:00 US C%sT 1989
2406 -6:00 Mexico C%sT 2010
2407 -6:00 US C%sT
2408 # Coahuila, Durango, Nuevo Leon, Tamaulipas (away from US border)
2409 Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
2410 -6:00 - CST 1988
2411 -6:00 US C%sT 1989
2412 -6:00 Mexico C%sT
2413 # Central Mexico
2414 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
2415 -7:00 - MST 1927 Jun 10 23:00
2416 -6:00 - CST 1930 Nov 15
2417 -7:00 - MST 1931 May 1 23:00
2418 -6:00 - CST 1931 Oct
2419 -7:00 - MST 1932 Apr 1
2420 -6:00 Mexico C%sT 2001 Sep 30 02:00
2421 -6:00 - CST 2002 Feb 20
2422 -6:00 Mexico C%sT
2423 # Chihuahua (near US border)
2424 Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20
2425 -7:00 - MST 1927 Jun 10 23:00
2426 -6:00 - CST 1930 Nov 15
2427 -7:00 - MST 1931 May 1 23:00
2428 -6:00 - CST 1931 Oct
2429 -7:00 - MST 1932 Apr 1
2430 -6:00 - CST 1996
2431 -6:00 Mexico C%sT 1998
2432 -6:00 - CST 1998 Apr Sun>=1 3:00
2433 -7:00 Mexico M%sT 2010
2434 -7:00 US M%sT
2435 # Chihuahua (away from US border)
2436 Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
2437 -7:00 - MST 1927 Jun 10 23:00
2438 -6:00 - CST 1930 Nov 15
2439 -7:00 - MST 1931 May 1 23:00
2440 -6:00 - CST 1931 Oct
2441 -7:00 - MST 1932 Apr 1
2442 -6:00 - CST 1996
2443 -6:00 Mexico C%sT 1998
2444 -6:00 - CST 1998 Apr Sun>=1 3:00
2445 -7:00 Mexico M%sT
2446 # Sonora
2447 Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
2448 -7:00 - MST 1927 Jun 10 23:00
2449 -6:00 - CST 1930 Nov 15
2450 -7:00 - MST 1931 May 1 23:00
2451 -6:00 - CST 1931 Oct
2452 -7:00 - MST 1932 Apr 1
2453 -6:00 - CST 1942 Apr 24
2454 -7:00 - MST 1949 Jan 14
2455 -8:00 - PST 1970
2456 -7:00 Mexico M%sT 1999
2457 -7:00 - MST
2458
2459 # From Alexander Krivenyshev (2010-04-21):
2460 # According to news, Bahía de Banderas (Mexican state of Nayarit)
2461 # changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to
2462 # share the same time zone as nearby city Puerto Vallarta, Jalisco).
2463 #
2464 # (Spanish)
2465 # Bahía de Banderas homologa su horario al del centro del
2466 # país, a partir de este domingo
2467 # <a href="http://www.nayarit.gob.mx/notes.asp?id=20748">
2468 # http://www.nayarit.gob.mx/notes.asp?id=20748
2469 # </a>
2470 #
2471 # Bahía de Banderas homologa su horario con el del Centro del
2472 # País
2473 # <a href="http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50">
2474 # http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50"
2475 # </a>
2476 #
2477 # (English)
2478 # Puerto Vallarta and Bahía de Banderas: One Time Zone
2479 # <a href="http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml">
2480 # http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml
2481 # </a>
2482 #
2483 # or
2484 # <a href="http://www.worldtimezone.com/dst_news/dst_news_mexico08.html">
2485 # http://www.worldtimezone.com/dst_news/dst_news_mexico08.html
2486 # </a>
2487 #
2488 # "Mexico's Senate approved the amendments to the Mexican Schedule System that
2489 # will allow Bahía de Banderas and Puerto Vallarta to share the same time
2490 # zone ..."
2491 # Baja California Sur, Nayarit, Sinaloa
2492
2493 # From Arthur David Olson (2010-05-01):
2494 # Use "Bahia_Banderas" to keep the name to fourteen characters.
2495
2496 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
2497 -7:00 - MST 1927 Jun 10 23:00
2498 -6:00 - CST 1930 Nov 15
2499 -7:00 - MST 1931 May 1 23:00
2500 -6:00 - CST 1931 Oct
2501 -7:00 - MST 1932 Apr 1
2502 -6:00 - CST 1942 Apr 24
2503 -7:00 - MST 1949 Jan 14
2504 -8:00 - PST 1970
2505 -7:00 Mexico M%sT
2506
2507 Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00
2508 -7:00 - MST 1927 Jun 10 23:00
2509 -6:00 - CST 1930 Nov 15
2510 -7:00 - MST 1931 May 1 23:00
2511 -6:00 - CST 1931 Oct
2512 -7:00 - MST 1932 Apr 1
2513 -6:00 - CST 1942 Apr 24
2514 -7:00 - MST 1949 Jan 14
2515 -8:00 - PST 1970
2516 -7:00 Mexico M%sT 2010 Apr 4 2:00
2517 -6:00 Mexico C%sT
2518
2519 # Baja California (near US border)
2520 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
2521 -7:00 - MST 1924
2522 -8:00 - PST 1927 Jun 10 23:00
2523 -7:00 - MST 1930 Nov 15
2524 -8:00 - PST 1931 Apr 1
2525 -8:00 1:00 PDT 1931 Sep 30
2526 -8:00 - PST 1942 Apr 24
2527 -8:00 1:00 PWT 1945 Aug 14 23:00u
2528 -8:00 1:00 PPT 1945 Nov 12 # Peace
2529 -8:00 - PST 1948 Apr 5
2530 -8:00 1:00 PDT 1949 Jan 14
2531 -8:00 - PST 1954
2532 -8:00 CA P%sT 1961
2533 -8:00 - PST 1976
2534 -8:00 US P%sT 1996
2535 -8:00 Mexico P%sT 2001
2536 -8:00 US P%sT 2002 Feb 20
2537 -8:00 Mexico P%sT 2010
2538 -8:00 US P%sT
2539 # Baja California (away from US border)
2540 Zone America/Santa_Isabel -7:39:28 - LMT 1922 Jan 1 0:20:32
2541 -7:00 - MST 1924
2542 -8:00 - PST 1927 Jun 10 23:00
2543 -7:00 - MST 1930 Nov 15
2544 -8:00 - PST 1931 Apr 1
2545 -8:00 1:00 PDT 1931 Sep 30
2546 -8:00 - PST 1942 Apr 24
2547 -8:00 1:00 PWT 1945 Aug 14 23:00u
2548 -8:00 1:00 PPT 1945 Nov 12 # Peace
2549 -8:00 - PST 1948 Apr 5
2550 -8:00 1:00 PDT 1949 Jan 14
2551 -8:00 - PST 1954
2552 -8:00 CA P%sT 1961
2553 -8:00 - PST 1976
2554 -8:00 US P%sT 1996
2555 -8:00 Mexico P%sT 2001
2556 -8:00 US P%sT 2002 Feb 20
2557 -8:00 Mexico P%sT
2558 # From Paul Eggert (2006-03-22):
2559 # Formerly there was an America/Ensenada zone, which differed from
2560 # America/Tijuana only in that it did not observe DST from 1976
2561 # through 1995. This was as per Shanks (1999). But Shanks & Pottenger say
2562 # Ensenada did not observe DST from 1948 through 1975. Guy Harris reports
2563 # that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and
2564 # Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
2565 # DST-observance was a town-by-town matter back then. This concerns
2566 # data after 1970 so most likely there should be at least one Zone
2567 # other than America/Tijuana for Baja, but it's not clear yet what its
2568 # name or contents should be.
2569 #
2570 # Revillagigedo Is
2571 # no information
2572
2573 ###############################################################################
2574
2575 # Anguilla
2576 # See 'southamerica'.
2577
2578 # Antigua and Barbuda
2579 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2580 Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
2581 -5:00 - EST 1951
2582 -4:00 - AST
2583
2584 # Bahamas
2585 #
2586 # For 1899 Milne gives -5:09:29.5; round that.
2587 #
2588 # From Sue Williams (2006-12-07):
2589 # The Bahamas announced about a month ago that they plan to change their DST
2590 # rules to sync with the U.S. starting in 2007....
2591 # http://www.jonesbahamas.com/?c=45&a=10412
2592
2593 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2594 Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S
2595 Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D
2596 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2597 Zone America/Nassau -5:09:30 - LMT 1912 Mar 2
2598 -5:00 Bahamas E%sT 1976
2599 -5:00 US E%sT
2600
2601 # Barbados
2602
2603 # For 1899 Milne gives -3:58:29.2; round that.
2604
2605 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2606 Rule Barb 1977 only - Jun 12 2:00 1:00 D
2607 Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
2608 Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
2609 Rule Barb 1979 only - Sep 30 2:00 0 S
2610 Rule Barb 1980 only - Sep 25 2:00 0 S
2611 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2612 Zone America/Barbados -3:58:29 - LMT 1924 # Bridgetown
2613 -3:58:29 - BMT 1932 # Bridgetown Mean Time
2614 -4:00 Barb A%sT
2615
2616 # Belize
2617 # Whitman entirely disagrees with Shanks; go with Shanks & Pottenger.
2618 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2619 Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
2620 Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
2621 Rule Belize 1973 only - Dec 5 0:00 1:00 D
2622 Rule Belize 1974 only - Feb 9 0:00 0 S
2623 Rule Belize 1982 only - Dec 18 0:00 1:00 D
2624 Rule Belize 1983 only - Feb 12 0:00 0 S
2625 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2626 Zone America/Belize -5:52:48 - LMT 1912 Apr
2627 -6:00 Belize C%sT
2628
2629 # Bermuda
2630
2631 # For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower,
2632 # Bermuda dockyard, Ireland I; round that.
2633
2634 # From Dan Jones, reporting in The Royal Gazette (2006-06-26):
2635
2636 # Next year, however, clocks in the US will go forward on the second Sunday
2637 # in March, until the first Sunday in November. And, after the Time Zone
2638 # (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2639 # Friday, the same thing will happen in Bermuda.
2640 # http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2641
2642 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2643 Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton
2644 -4:00 - AST 1974 Apr 28 2:00
2645 -4:00 Canada A%sT 1976
2646 -4:00 US A%sT
2647
2648 # Cayman Is
2649 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2650 Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
2651 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
2652 -5:00 - EST
2653
2654 # Costa Rica
2655
2656 # Milne gives -5:36:13.3 as San Jose mean time; round to nearest.
2657
2658 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2659 Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
2660 Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
2661 Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
2662 # IATA SSIM (1991-09) says the following was at 1:00;
2663 # go with Shanks & Pottenger.
2664 Rule CR 1991 only - Jul 1 0:00 0 S
2665 Rule CR 1992 only - Mar 15 0:00 0 S
2666 # There are too many San Joses elsewhere, so we'll use 'Costa Rica'.
2667 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2668 Zone America/Costa_Rica -5:36:13 - LMT 1890 # San Jose
2669 -5:36:13 - SJMT 1921 Jan 15 # San Jose Mean Time
2670 -6:00 CR C%sT
2671 # Coco
2672 # no information; probably like America/Costa_Rica
2673
2674 # Cuba
2675
2676 # From Paul Eggert (2013-02-21):
2677 # Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57
2678 # for the port, and -5:30 for meteorological observations.
2679 # For now, stick with Shanks & Pottenger.
2680
2681 # From Arthur David Olson (1999-03-29):
2682 # The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
2683 # the Cuban National Team and the Baltimore Orioles was carried live on
2684 # the Orioles Radio Network, including affiliate WTOP in Washington, DC.
2685 # During the game, play-by-play announcer Jim Hunter noted that
2686 # "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
2687 # Time today." (The "two hour" remark referred to losing one hour of
2688 # sleep on 1999-03-28--when the announcers were in Cuba as it switched
2689 # to DST--and one more hour on 1999-04-04--when the announcers will have
2690 # returned to Baltimore, which switches on that date.)
2691
2692 # From Steffen Thorsen (2013-11-11):
2693 # DST start in Cuba in 2004 ... does not follow the same rules as the
2694 # years before. The correct date should be Sunday 2004-03-28 00:00 ...
2695 # https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html
2696
2697 # From Evert van der Veer via Steffen Thorsen (2004-10-28):
2698 # Cuba is not going back to standard time this year.
2699 # From Paul Eggert (2006-03-22):
2700 # http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
2701 # says that it's due to a problem at the Antonio Guiteras
2702 # thermoelectric plant, and says "This October there will be no return
2703 # to normal hours (after daylight saving time)".
2704 # For now, let's assume that it's a temporary measure.
2705
2706 # From Carlos A. Carnero Delgado (2005-11-12):
2707 # This year (just like in 2004-2005) there's no change in time zone
2708 # adjustment in Cuba. We will stay in daylight saving time:
2709 # http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html
2710
2711 # From Jesper Norgaard Welen (2006-10-21):
2712 # An article in GRANMA INTERNACIONAL claims that Cuba will end
2713 # the 3 years of permanent DST next weekend, see
2714 # http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html
2715 # "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
2716 # watches should be set back one hour -- going back to 00:00 hours -- returning
2717 # to the normal schedule....
2718
2719 # From Paul Eggert (2007-03-02):
2720 # http://www.granma.cubaweb.cu/english/news/art89.html, dated yesterday,
2721 # says Cuban clocks will advance at midnight on March 10.
2722 # For lack of better information, assume Cuba will use US rules,
2723 # except that it switches at midnight standard time as usual.
2724 #
2725 # From Steffen Thorsen (2007-10-25):
2726 # Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
2727 # earlier - on the last Sunday of October, just like in 2006.
2728 #
2729 # He supplied these references:
2730 #
2731 # http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES
2732 # http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm
2733 #
2734 # From Alex Kryvenishev (2007-10-25):
2735 # Here is also article from Granma (Cuba):
2736 #
2737 # [Regira] el Horario Normal desde el [proximo] domingo 28 de octubre
2738 # http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
2739 #
2740 # http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
2741
2742 # From Arthur David Olson (2008-03-09):
2743 # I'm in Maryland which is now observing United States Eastern Daylight
2744 # Time. At 9:44 local time I used RealPlayer to listen to
2745 # <a href="http://media.enet.cu/radioreloj">
2746 # http://media.enet.cu/radioreloj
2747 # </a>, a Cuban information station, and heard
2748 # the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
2749 # indicating that Cuba is still on standard time.
2750
2751 # From Steffen Thorsen (2008-03-12):
2752 # It seems that Cuba will start DST on Sunday, 2007-03-16...
2753 # It was announced yesterday, according to this source (in Spanish):
2754 # <a href="http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm">
2755 # http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
2756 # </a>
2757 #
2758 # Some more background information is posted here:
2759 # <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html">
2760 # http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
2761 # </a>
2762 #
2763 # The article also says that Cuba has been observing DST since 1963,
2764 # while Shanks (and tzdata) has 1965 as the first date (except in the
2765 # 1940's). Many other web pages in Cuba also claim that it has been
2766 # observed since 1963, but with the exception of 1970 - an exception
2767 # which is not present in tzdata/Shanks. So there is a chance we need to
2768 # change some historic records as well.
2769 #
2770 # One example:
2771 # <a href="http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm">
2772 # http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
2773 # </a>
2774
2775 # From Jesper Norgaard Welen (2008-03-13):
2776 # The Cuban time change has just been confirmed on the most authoritative
2777 # web site, the Granma. Please check out
2778 # <a href="http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html">
2779 # http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
2780 # </a>
2781 #
2782 # Basically as expected after Steffen Thorsens information, the change
2783 # will take place midnight between Saturday and Sunday.
2784
2785 # From Arthur David Olson (2008-03-12):
2786 # Assume Sun>=15 (third Sunday) going forward.
2787
2788 # From Alexander Krivenyshev (2009-03-04)
2789 # According to the Radio Reloj - Cuba will start Daylight Saving Time on
2790 # midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009-
2791 # not on midnight March 14 / March 15 as previously thought.
2792 #
2793 # <a href="http://www.worldtimezone.com/dst_news/dst_news_cuba05.html">
2794 # http://www.worldtimezone.com/dst_news/dst_news_cuba05.html
2795 # (in Spanish)
2796 # </a>
2797
2798 # From Arthur David Olson (2009-03-09)
2799 # I listened over the Internet to
2800 # <a href="http://media.enet.cu/readioreloj">
2801 # http://media.enet.cu/readioreloj
2802 # </a>
2803 # this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
2804 # the time was announced as "diez cinco"--the same time as here, indicating
2805 # that has indeed switched to DST. Assume second Sunday from 2009 forward.
2806
2807 # From Steffen Thorsen (2011-03-08):
2808 # Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00
2809 # this year. Nothing about the end date known so far (if that has
2810 # changed at all).
2811 #
2812 # Source:
2813 # <a href="http://granma.co.cu/2011/03/08/nacional/artic01.html">
2814 # http://granma.co.cu/2011/03/08/nacional/artic01.html
2815 # </a>
2816 #
2817 # Our info:
2818 # <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html">
2819 # http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html
2820 # </a>
2821 #
2822 # From Steffen Thorsen (2011-10-30)
2823 # Cuba will end DST two weeks later this year. Instead of going back
2824 # tonight, it has been delayed to 2011-11-13 at 01:00.
2825 #
2826 # One source (Spanish)
2827 # <a href="http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html">
2828 # http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html
2829 # </a>
2830 #
2831 # Our page:
2832 # <a href="http://www.timeanddate.com/news/time/cuba-time-changes-2011.html">
2833 # http://www.timeanddate.com/news/time/cuba-time-changes-2011.html
2834 # </a>
2835 #
2836 # From Steffen Thorsen (2012-03-01)
2837 # According to Radio Reloj, Cuba will start DST on Midnight between March
2838 # 31 and April 1.
2839 #
2840 # Radio Reloj has the following info (Spanish):
2841 # <a href="http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril">
2842 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril
2843 # </a>
2844 #
2845 # Our info on it:
2846 # <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html">
2847 # http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html
2848 # </a>
2849
2850 # From Steffen Thorsen (2012-11-03):
2851 # Radio Reloj and many other sources report that Cuba is changing back
2852 # to standard time on 2012-11-04:
2853 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre
2854 # From Paul Eggert (2012-11-03):
2855 # For now, assume the future rule is first Sunday in November.
2856
2857 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2858 Rule Cuba 1928 only - Jun 10 0:00 1:00 D
2859 Rule Cuba 1928 only - Oct 10 0:00 0 S
2860 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
2861 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
2862 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
2863 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
2864 Rule Cuba 1965 only - Jun 1 0:00 1:00 D
2865 Rule Cuba 1965 only - Sep 30 0:00 0 S
2866 Rule Cuba 1966 only - May 29 0:00 1:00 D
2867 Rule Cuba 1966 only - Oct 2 0:00 0 S
2868 Rule Cuba 1967 only - Apr 8 0:00 1:00 D
2869 Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
2870 Rule Cuba 1968 only - Apr 14 0:00 1:00 D
2871 Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
2872 Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
2873 Rule Cuba 1972 1974 - Oct 8 0:00 0 S
2874 Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
2875 Rule Cuba 1978 only - May 7 0:00 1:00 D
2876 Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
2877 Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
2878 Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
2879 Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
2880 Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
2881 Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
2882 Rule Cuba 1996 only - Oct 6 0:00s 0 S
2883 Rule Cuba 1997 only - Oct 12 0:00s 0 S
2884 Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
2885 Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S
2886 Rule Cuba 2000 2003 - Apr Sun>=1 0:00s 1:00 D
2887 Rule Cuba 2004 only - Mar lastSun 0:00s 1:00 D
2888 Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S
2889 Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D
2890 Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D
2891 Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D
2892 Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D
2893 Rule Cuba 2011 only - Nov 13 0:00s 0 S
2894 Rule Cuba 2012 only - Apr 1 0:00s 1:00 D
2895 Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S
2896 Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D
2897
2898 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2899 Zone America/Havana -5:29:28 - LMT 1890
2900 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
2901 -5:00 Cuba C%sT
2902
2903 # Dominica
2904 # See 'southamerica'.
2905
2906 # Dominican Republic
2907
2908 # From Steffen Thorsen (2000-10-30):
2909 # Enrique Morales reported to me that the Dominican Republic has changed the
2910 # time zone to Eastern Standard Time as of Sunday 29 at 2 am....
2911 # http://www.listin.com.do/antes/261000/republica/princi.html
2912
2913 # From Paul Eggert (2000-12-04):
2914 # That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
2915
2916 # From Rives McDow (2000-12-01):
2917 # Dominican Republic changed its mind and presidential decree on Tuesday,
2918 # November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
2919 # Dominican Republic will be reverting to 8 hours from the International Date
2920 # Line, and will not be using DST in the foreseeable future. The reason they
2921 # decided to use DST was to be in synch with Puerto Rico, who was also going
2922 # to implement DST. When Puerto Rico didn't implement DST, the president
2923 # decided to revert.
2924
2925
2926 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2927 Rule DR 1966 only - Oct 30 0:00 1:00 D
2928 Rule DR 1967 only - Feb 28 0:00 0 S
2929 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
2930 Rule DR 1970 only - Feb 21 0:00 0 S
2931 Rule DR 1971 only - Jan 20 0:00 0 S
2932 Rule DR 1972 1974 - Jan 21 0:00 0 S
2933 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2934 Zone America/Santo_Domingo -4:39:36 - LMT 1890
2935 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
2936 -5:00 DR E%sT 1974 Oct 27
2937 -4:00 - AST 2000 Oct 29 02:00
2938 -5:00 US E%sT 2000 Dec 3 01:00
2939 -4:00 - AST
2940
2941 # El Salvador
2942
2943 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2944 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
2945 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
2946 # There are too many San Salvadors elsewhere, so use America/El_Salvador
2947 # instead of America/San_Salvador.
2948 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2949 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
2950 -6:00 Salv C%sT
2951
2952 # Grenada
2953 # Guadeloupe
2954 # St Barthelemy
2955 # St Martin (French part)
2956 # See 'southamerica'.
2957
2958 # Guatemala
2959 #
2960 # From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
2961 # Diario Co Latino, at
2962 # http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079,
2963 # says in an article dated 2006-04-19 that the Guatemalan government had
2964 # decided on that date to advance official time by 60 minutes, to lessen the
2965 # impact of the elevated cost of oil.... Daylight saving time will last from
2966 # 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
2967 # From Paul Eggert (2006-06-22):
2968 # The Ministry of Energy and Mines, press release CP-15/2006
2969 # (2006-04-19), says DST ends at 24:00. See
2970 # <http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf>.
2971
2972 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2973 Rule Guat 1973 only - Nov 25 0:00 1:00 D
2974 Rule Guat 1974 only - Feb 24 0:00 0 S
2975 Rule Guat 1983 only - May 21 0:00 1:00 D
2976 Rule Guat 1983 only - Sep 22 0:00 0 S
2977 Rule Guat 1991 only - Mar 23 0:00 1:00 D
2978 Rule Guat 1991 only - Sep 7 0:00 0 S
2979 Rule Guat 2006 only - Apr 30 0:00 1:00 D
2980 Rule Guat 2006 only - Oct 1 0:00 0 S
2981 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2982 Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
2983 -6:00 Guat C%sT
2984
2985 # Haiti
2986 # From Gwillim Law (2005-04-15):
2987 # Risto O. Nykanen wrote me that Haiti is now on DST.
2988 # I searched for confirmation, and I found a
2989 # <a href="http://www.haitianconsulate.org/time.doc"> press release
2990 # on the Web page of the Haitian Consulate in Chicago (2005-03-31),
2991 # </a>. Translated from French, it says:
2992 #
2993 # "The Prime Minister's Communication Office notifies the public in general
2994 # and the press in particular that, following a decision of the Interior
2995 # Ministry and the Territorial Collectivities [I suppose that means the
2996 # provinces], Haiti will move to Eastern Daylight Time in the night from next
2997 # Saturday the 2nd to Sunday the 3rd.
2998 #
2999 # "Consequently, the Prime Minister's Communication Office wishes to inform
3000 # the population that the country's clocks will be set forward one hour
3001 # starting at midnight. This provision will hold until the last Saturday in
3002 # October 2005.
3003 #
3004 # "Port-au-Prince, March 31, 2005"
3005 #
3006 # From Steffen Thorsen (2006-04-04):
3007 # I have been informed by users that Haiti observes DST this year like
3008 # last year, so the current "only" rule for 2005 might be changed to a
3009 # "max" rule or to last until 2006. (Who knows if they will observe DST
3010 # next year or if they will extend their DST like US/Canada next year).
3011 #
3012 # I have found this article about it (in French):
3013 # http://www.haitipressnetwork.com/news.cfm?articleID=7612
3014 #
3015 # The reason seems to be an energy crisis.
3016
3017 # From Stephen Colebourne (2007-02-22):
3018 # Some IATA info: Haiti won't be having DST in 2007.
3019
3020 # From Steffen Thorsen (2012-03-11):
3021 # According to several news sources, Haiti will observe DST this year,
3022 # apparently using the same start and end date as USA/Canada.
3023 # So this means they have already changed their time.
3024 #
3025 # http://www.alterpresse.org/spip.php?article12510
3026 # http://radiovision2000haiti.net/home/?p=13253
3027 #
3028 # From Arthur David Olson (2012-03-11):
3029 # The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to
3030 # 3:00 a.m. rather than the traditional Haitian jump at midnight.
3031 # Assume a US-style fall back as well.
3032
3033 # From Steffen Thorsen (2013-03-10):
3034 # It appears that Haiti is observing DST this year as well, same rules
3035 # as US/Canada. They did it last year as well, and it looks like they
3036 # are going to observe DST every year now...
3037 #
3038 # http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/
3039 # http://www.canalplushaiti.net/?p=6714
3040
3041 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3042 Rule Haiti 1983 only - May 8 0:00 1:00 D
3043 Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
3044 Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
3045 # Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
3046 # Go with IATA.
3047 Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
3048 Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
3049 Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
3050 Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S
3051 Rule Haiti 2012 max - Mar Sun>=8 2:00 1:00 D
3052 Rule Haiti 2012 max - Nov Sun>=1 2:00 0 S
3053 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3054 Zone America/Port-au-Prince -4:49:20 - LMT 1890
3055 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
3056 -5:00 Haiti E%sT
3057
3058 # Honduras
3059 # Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.
3060
3061 # From Paul Eggert (2006-05-05):
3062 # worldtimezone.com reports a 2006-05-02 Spanish-language AP article
3063 # saying Honduras will start using DST midnight Saturday, effective 4
3064 # months until September. La Tribuna reported today
3065 # <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president
3066 # of Honduras, refused to back down on this.
3067
3068 # From Jesper Norgaard Welen (2006-08-08):
3069 # It seems that Honduras has returned from DST to standard time this Monday at
3070 # 00:00 hours (prolonging Sunday to 25 hours duration).
3071 # http://www.worldtimezone.com/dst_news/dst_news_honduras04.html
3072
3073 # From Paul Eggert (2006-08-08):
3074 # Also see Diario El Heraldo, The country returns to standard time (2006-08-08)
3075 # <http://www.elheraldo.hn/nota.php?nid=54941&sec=12>.
3076 # It mentions executive decree 18-2006.
3077
3078 # From Steffen Thorsen (2006-08-17):
3079 # Honduras will observe DST from 2007 to 2009, exact dates are not
3080 # published, I have located this authoritative source:
3081 # http://www.presidencia.gob.hn/noticia.aspx?nId=47
3082
3083 # From Steffen Thorsen (2007-03-30):
3084 # http://www.laprensahn.com/pais_nota.php?id04962=7386
3085 # So it seems that Honduras will not enter DST this year....
3086
3087 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3088 Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D
3089 Rule Hond 1987 1988 - Sep lastSun 0:00 0 S
3090 Rule Hond 2006 only - May Sun>=1 0:00 1:00 D
3091 Rule Hond 2006 only - Aug Mon>=1 0:00 0 S
3092 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3093 Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
3094 -6:00 Hond C%sT
3095 #
3096 # Great Swan I ceded by US to Honduras in 1972
3097
3098 # Jamaica
3099 # Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
3100 # unspecified official document, and says "This time is used throughout the
3101 # island". Go with Milne. Round to the nearest second as required by zic.
3102 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3103 Zone America/Jamaica -5:07:11 - LMT 1890 # Kingston
3104 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3105 -5:00 - EST 1974 Apr 28 2:00
3106 -5:00 US E%sT 1984
3107 -5:00 - EST
3108
3109 # Martinique
3110 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3111 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
3112 -4:04:20 - FFMT 1911 May # Fort-de-France MT
3113 -4:00 - AST 1980 Apr 6
3114 -4:00 1:00 ADT 1980 Sep 28
3115 -4:00 - AST
3116
3117 # Montserrat
3118 # See 'southamerica'.
3119
3120 # Nicaragua
3121 #
3122 # This uses Shanks & Pottenger for times before 2005.
3123 #
3124 # From Steffen Thorsen (2005-04-12):
3125 # I've got reports from 8 different people that Nicaragua just started
3126 # DST on Sunday 2005-04-10, in order to save energy because of
3127 # expensive petroleum. The exact end date for DST is not yet
3128 # announced, only "September" but some sites also say "mid-September".
3129 # Some background information is available on the President's official site:
3130 # http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
3131 # The Decree, no 23-2005 is available here:
3132 # http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2005/Decreto%2023-2005%20Se%20adelanta%20en%20una%20hora%20en%20todo%20el%20territorio%20nacional%20apartir%20de%20las%2024horas%20del%2009%20de%20Abril.pdf
3133 #
3134 # From Paul Eggert (2005-05-01):
3135 # The decree doesn't say anything about daylight saving, but for now let's
3136 # assume that it is daylight saving....
3137 #
3138 # From Gwillim Law (2005-04-21):
3139 # The Associated Press story on the time change, which can be found at
3140 # http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
3141 # and elsewhere, says (fifth paragraph, translated from Spanish): "The last
3142 # time that a change of clocks was applied to save energy was in the year 2000
3143 # during the Arnoldo Aleman administration."...
3144 # The northamerica file says that Nicaragua has been on UTC-6 continuously
3145 # since December 1998. I wasn't able to find any details of Nicaraguan time
3146 # changes in 2000. Perhaps a note could be added to the northamerica file, to
3147 # the effect that we have indirect evidence that DST was observed in 2000.
3148 #
3149 # From Jesper Norgaard Welen (2005-11-02):
3150 # Nicaragua left DST the 2005-10-02 at 00:00 (local time).
3151 # http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
3152 # (2005-09-26)
3153 #
3154 # From Jesper Norgaard Welen (2006-05-05):
3155 # http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410
3156 # (my informal translation)
3157 # By order of the president of the republic, Enrique Bolanos, Nicaragua
3158 # advanced by sixty minutes their official time, yesterday at 2 in the
3159 # morning, and will stay that way until 30.th. of september.
3160 #
3161 # From Jesper Norgaard Welen (2006-09-30):
3162 # http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf
3163 # My informal translation runs:
3164 # The natural sun time is restored in all the national territory, in that the
3165 # time is returned one hour at 01:00 am of October 1 of 2006.
3166 #
3167 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3168 Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
3169 Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
3170 Rule Nic 2005 only - Apr 10 0:00 1:00 D
3171 Rule Nic 2005 only - Oct Sun>=1 0:00 0 S
3172 Rule Nic 2006 only - Apr 30 2:00 1:00 D
3173 Rule Nic 2006 only - Oct Sun>=1 1:00 0 S
3174 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3175 Zone America/Managua -5:45:08 - LMT 1890
3176 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
3177 -6:00 - CST 1973 May
3178 -5:00 - EST 1975 Feb 16
3179 -6:00 Nic C%sT 1992 Jan 1 4:00
3180 -5:00 - EST 1992 Sep 24
3181 -6:00 - CST 1993
3182 -5:00 - EST 1997
3183 -6:00 Nic C%sT
3184
3185 # Panama
3186 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3187 Zone America/Panama -5:18:08 - LMT 1890
3188 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
3189 -5:00 - EST
3190
3191 # Puerto Rico
3192 # There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
3193 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3194 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
3195 -4:00 - AST 1942 May 3
3196 -4:00 US A%sT 1946
3197 -4:00 - AST
3198
3199 # St Kitts-Nevis
3200 # St Lucia
3201 # See 'southamerica'.
3202
3203 # St Pierre and Miquelon
3204 # There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
3205 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3206 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3207 -4:00 - AST 1980 May
3208 -3:00 - PMST 1987 # Pierre & Miquelon Time
3209 -3:00 Canada PM%sT
3210
3211 # St Vincent and the Grenadines
3212 # See 'southamerica'.
3213
3214 # Turks and Caicos
3215 #
3216 # From Chris Dunn in
3217 # <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007>
3218 # (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
3219 # daylight saving dates for time changes have been adjusted to match
3220 # the recent U.S. change of dates.
3221 #
3222 # From Brian Inglis (2007-04-28):
3223 # http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
3224 # there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
3225 # rows before that there is an out of date entry for Oct:
3226 # "Eastern Standard Times Begins 2007
3227 # Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
3228 # indicating that the normal ET rules are followed.
3229 #
3230 # From Paul Eggert (2006-05-01):
3231 # Shanks & Pottenger say they use US DST rules, but IATA SSIM (1991/1998)
3232 # says they switch at midnight. Go with Shanks & Pottenger.
3233 #
3234 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3235 Rule TC 1979 1986 - Apr lastSun 2:00 1:00 D
3236 Rule TC 1979 2006 - Oct lastSun 2:00 0 S
3237 Rule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D
3238 Rule TC 2007 max - Mar Sun>=8 2:00 1:00 D
3239 Rule TC 2007 max - Nov Sun>=1 2:00 0 S
3240 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3241 Zone America/Grand_Turk -4:44:32 - LMT 1890
3242 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3243 -5:00 TC E%sT
3244
3245 # British Virgin Is
3246 # Virgin Is
3247 # See 'southamerica'.