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 # This file is in the public domain, so clarified as of
25 # 2009-05-17 by Arthur David Olson.
26
27 # also includes Central America and the Caribbean
28
29 # This file is by no means authoritative; if you think you know better,
30 # go ahead and edit the file (and please send any changes to
31 # tz@iana.org for general use in the future). For more, please see
32 # the file CONTRIBUTING in the tz distribution.
33
34 # From Paul Eggert (1999-03-22):
35 # A reliable and entertaining source about time zones is
36 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
37
38 ###############################################################################
39
40 # United States
41
42 # From Paul Eggert (1999-03-31):
43 # Howse writes (pp 121-125) that time zones were invented by
44 # Professor Charles Ferdinand Dowd (1825-1904),
45 # Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
46 # His pamphlet "A System of National Time for Railroads" (1870)
47 # was the result of his proposals at the Convention of Railroad Trunk Lines
48 # in New York City (1869-10). His 1870 proposal was based on Washington, DC,
49 # but in 1872-05 he moved the proposed origin to Greenwich.
50 # His proposal was adopted by the railroads on 1883-11-18 at 12:00,
51 # and the most of the country soon followed suit.
52
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, Ten years of daylight saving from the Pittsburgh standpoint
86 # (Carnegie Library of Pittsburgh, 1927).
87 # http://www.clpgh.org/exhibit/dst.html
88 #
89 # Shanks says that DST was called "War Time" in the US in 1918 and 1919.
90 # However, DST was imposed by the Standard Time Act of 1918, which
91 # was the first nationwide legal time standard, and apparently
92 # time was just called "Standard Time" or "Daylight Saving Time".
93
94 # From Arthur David Olson:
95 # US Daylight Saving Time ended on the last Sunday of *October* in 1974.
96 # See, for example, the front page of the Saturday, 1974-10-26
97 # and Sunday, 1974-10-27 editions of the Washington Post.
98
99 # From Arthur David Olson:
100 # Before the Uniform Time Act of 1966 took effect in 1967, observance of
101 # Daylight Saving Time in the US was by local option, except during wartime.
102
103 # From Arthur David Olson (2000-09-25):
104 # Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama.
105 # In the introduction, Oboler spoke of "Eastern Peace Time."
106 # An AltaVista search turned up:
107 # http://rowayton.org/rhs/hstaug45.html
108 # "When the time is announced over the radio now, it is 'Eastern Peace
109 # Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful."
110 # (August 1945) by way of confirmation.
111
112 # From Joseph Gallant citing
113 # George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
114 # At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
115 # to switch to London for Attlee's address, but the American people
116 # never got to hear his speech live. According to one press account,
117 # CBS' Bob Trout was first to announce the word of Japan's surrender,
118 # but a few seconds later, NBC, ABC and Mutual also flashed the word
119 # of surrender, all of whom interrupting the bells of Big Ben in
120 # London which were to precede Mr. Attlee's speech.
121
122 # From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From
123 # Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times:
124 #
125 # ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender.
126 # Any announcement from Asia would reach St. John's New York newsroom on a
127 # wire service teletype machine, which had prescribed signals for major news.
128 # Associated Press, for example, would ring five bells before spewing out
129 # typed copy of an important story, and 10 bells for news "of transcendental
130 # importance."
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 lastSun 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 ... "Chamorro Standard Time"
254 # for time in Guam and the Northern Marianas. See the file "australasia".
255 #
256 # From Paul Eggert (2015-04-17):
257 # HST and HDT are standardized abbreviations for Hawaii-Aleutian
258 # standard and daylight times. See section 9.47 (p 234) of the
259 # U.S. Government Printing Office Style Manual (2008)
260 # http://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf
261
262 # From Arthur David Olson, 2005-08-09
263 # The following was signed into law on 2005-08-08.
264 #
265 # H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
266 # (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15
267 # U.S.C. 260a(a)) is amended--
268 # (1) by striking "first Sunday of April" and inserting "second
269 # Sunday of March"; and
270 # (2) by striking "last Sunday of October" and inserting "first
271 # Sunday of November'.
272 # (b) Effective Date.--Subsection (a) shall take effect 1 year after the
273 # date of enactment of this Act or March 1, 2007, whichever is later.
274 # (c) Report to Congress.--Not later than 9 months after the effective
275 # date stated in subsection (b), the Secretary shall report to Congress
276 # on the impact of this section on energy consumption in the United
277 # States.
278 # (d) Right to Revert.--Congress retains the right to revert the
279 # Daylight Saving Time back to the 2005 time schedules once the
280 # Department study is complete.
281
282 # US eastern time, represented by New York
283
284 # Connecticut, Delaware, District of Columbia, most of Florida,
285 # Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky
286 # (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts,
287 # New Hampshire, New Jersey, New York, North Carolina, Ohio,
288 # Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
289 # Vermont, Virginia, West Virginia
290
291 # From Dave Cantor (2004-11-02):
292 # Early this summer I had the occasion to visit the Mount Washington
293 # Observatory weather station atop (of course!) Mount Washington [, NH]....
294 # One of the staff members said that the station was on Eastern Standard Time
295 # and didn't change their clocks for Daylight Saving ... so that their
296 # reports will always have times which are 5 hours behind UTC.
297
298 # From Paul Eggert (2005-08-26):
299 # According to today's Huntsville Times
300 # http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1
301 # a few towns on Alabama's "eastern border with Georgia, such as Phenix City
302 # in Russell County, Lanett in Chambers County and some towns in Lee County,
303 # set their watches and clocks on Eastern time." It quotes H.H. "Bubba"
304 # Roberts, city administrator in Phenix City. as saying "We are in the Central
305 # time zone, but we do go by the Eastern time zone because so many people work
306 # in Columbus."
307
308 # From Paul Eggert (2014-09-06):
309 # Monthly Notices of the Royal Astronomical Society 44, 4 (1884-02-08), 208
310 # says that New York City Hall time was 3 minutes 58.4 seconds fast of
311 # Eastern time (i.e., -4:56:01.6) just before the 1883 switch. Round to the
312 # nearest second.
313
314 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
315 Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
316 Rule NYC 1920 only - Oct lastSun 2:00 0 S
317 Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
318 Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
319 Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
320 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
321 Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58
322 -5:00 US E%sT 1920
323 -5:00 NYC E%sT 1942
324 -5:00 US E%sT 1946
325 -5:00 NYC E%sT 1967
326 -5:00 US E%sT
327
328 # US central time, represented by Chicago
329
330 # Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia,
331 # Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and
332 # Washington counties), Illinois, western Indiana
333 # (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
334 # Vanderburgh, and Warrick counties), Iowa, most of Kansas, western
335 # Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern
336 # Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota,
337 # western Tennessee, most of Texas, Wisconsin
338
339 # From Larry M. Smith (2006-04-26) re Wisconsin:
340 # http://www.legis.state.wi.us/statutes/Stat0175.pdf ...
341 # is currently enforced at the 01:00 time of change. Because the local
342 # "bar time" in the state corresponds to 02:00, a number of citations
343 # are issued for the "sale of class 'B' alcohol after prohibited
344 # hours" within the deviated hour of this change every year....
345 #
346 # From Douglas R. Bomberg (2007-03-12):
347 # Wisconsin has enacted (nearly eleventh-hour) legislation to get WI
348 # Statue 175 closer in synch with the US Congress' intent....
349 # http://www.legis.state.wi.us/2007/data/acts/07Act3.pdf
350
351 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
352 Rule Chicago 1920 only - Jun 13 2:00 1:00 D
353 Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
354 Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
355 Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
356 Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
357 Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
358 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
359 Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24
360 -6:00 US C%sT 1920
361 -6:00 Chicago C%sT 1936 Mar 1 2:00
362 -5:00 - EST 1936 Nov 15 2:00
363 -6:00 Chicago C%sT 1942
364 -6:00 US C%sT 1946
365 -6:00 Chicago C%sT 1967
366 -6:00 US C%sT
367 # Oliver County, ND switched from mountain to central time on 1992-10-25.
368 Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48
369 -7:00 US M%sT 1992 Oct 25 2:00
370 -6:00 US C%sT
371 # Morton County, ND, switched from mountain to central time on
372 # 2003-10-26, except for the area around Mandan which was already central time.
373 # See <http://dmses.dot.gov/docimages/p63/135818.pdf>.
374 # Officially this switch also included part of Sioux County, and
375 # Jones, Mellette, and Todd Counties in South Dakota;
376 # but in practice these other counties were already observing central time.
377 # See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>.
378 Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21
379 -7:00 US M%sT 2003 Oct 26 2:00
380 -6:00 US C%sT
381
382 # From Josh Findley (2011-01-21):
383 # ...it appears that Mercer County, North Dakota, changed from the
384 # mountain time zone to the central time zone at the last transition from
385 # daylight-saving to standard time (on Nov. 7, 2010):
386 # http://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm
387 # http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html
388
389 # From Andy Lipscomb (2011-01-24):
390 # ...according to the Census Bureau, the largest city is Beulah (although
391 # it's commonly referred to as Beulah-Hazen, with Hazen being the next
392 # largest city in Mercer County). Google Maps places Beulah's city hall
393 # at 47 degrees 15' 51" N, 101 degrees 46' 40" W, which yields an offset
394 # of 6h47'07".
395
396 Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
397 -7:00 US M%sT 2010 Nov 7 2:00
398 -6:00 US C%sT
399
400 # US mountain time, represented by Denver
401 #
402 # Colorado, far western Kansas, Montana, western
403 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
404 # New Mexico, southwestern North Dakota,
405 # western South Dakota, far western Texas (El Paso County, Hudspeth County,
406 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
407 #
408 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
409 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
410 Rule Denver 1920 only - Oct lastSun 2:00 0 S
411 Rule Denver 1921 only - May 22 2:00 0 S
412 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
413 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
414 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
415 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04
416 -7:00 US M%sT 1920
417 -7:00 Denver M%sT 1942
418 -7:00 US M%sT 1946
419 -7:00 Denver M%sT 1967
420 -7:00 US M%sT
421
422 # US Pacific time, represented by Los Angeles
423 #
424 # California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
425 # Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county
426 # north of the Salmon River, and the towns of Burgdorf and Warren),
427 # Nevada (except West Wendover), Oregon (except the northern 3/4 of
428 # Malheur county), and Washington
429 #
430 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
431 Rule CA 1948 only - Mar 14 2:00 1:00 D
432 Rule CA 1949 only - Jan 1 2:00 0 S
433 Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
434 Rule CA 1950 1961 - Sep lastSun 2:00 0 S
435 Rule CA 1962 1966 - Oct lastSun 2:00 0 S
436 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
437 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02
438 -8:00 US P%sT 1946
439 -8:00 CA P%sT 1967
440 -8:00 US P%sT
441
442 # Alaska
443 # AK%sT is the modern abbreviation for -9:00 per USNO.
444 #
445 # From Paul Eggert (2001-05-30):
446 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
447 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
448 # This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
449 # also a Friday. Include only the time zone part of this transition,
450 # ignoring the switch from Julian to Gregorian, since we can't represent
451 # the Julian calendar.
452 #
453 # As far as we know, none of the exact locations mentioned below were
454 # permanently inhabited in 1867 by anyone using either calendar.
455 # (Yakutat was colonized by the Russians in 1799, but the settlement
456 # was destroyed in 1805 by a Yakutat-kon war party.) However, there
457 # were nearby inhabitants in some cases and for our purposes perhaps
458 # it's best to simply use the official transition.
459
460 # From Paul Eggert (2014-07-18):
461 # One opinion of the early-1980s turmoil in Alaska over time zones and
462 # daylight saving time appeared as graffiti on a Juneau airport wall:
463 # "Welcome to Juneau. Please turn your watch back to the 19th century."
464 # See: Turner W. Alaska's four time zones now two. NY Times 1983-11-01.
465 # http://www.nytimes.com/1983/11/01/us/alaska-s-four-time-zones-now-two.html
466 #
467 # Steve Ferguson (2011-01-31) referred to the following source:
468 # Norris F. Keeping time in Alaska: national directives, local response.
469 # Alaska History 2001;16(1-2).
470 # http://alaskahistoricalsociety.org/discover-alaska/glimpses-of-the-past/keeping-time-in-alaska/
471
472 # From Arthur David Olson (2011-02-01):
473 # Here's database-relevant material from the 2001 "Alaska History" article:
474 #
475 # On September 20 [1979]...DOT...officials decreed that on April 27,
476 # 1980, Juneau and other nearby communities would move to Yukon Time.
477 # Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on
478 # Pacific Time.
479 #
480 # ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the
481 # Department's September 1979 decision. Juneau and other communities in
482 # northern Southeast reverted to Pacific Time on October 26.
483 #
484 # On October 28 [1983]...the Metlakatla Indian Community Council voted
485 # unanimously to keep the reservation on Pacific Time.
486 #
487 # According to DOT official Joanne Petrie, Indian reservations are not
488 # bound to follow time zones imposed by neighboring jurisdictions.
489 #
490 # (The last is consistent with how the database now handles the Navajo
491 # Nation.)
492
493 # From Arthur David Olson (2011-02-09):
494 # I just spoke by phone with a staff member at the Metlakatla Indian
495 # Community office (using contact information available at
496 # http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla
497 # It's shortly after 1:00 here on the east coast of the United States;
498 # the staffer said it was shortly after 10:00 there. When I asked whether
499 # that meant they were on Pacific time, they said no - they were on their
500 # own time. I asked about daylight saving; they said it wasn't used. I
501 # did not inquire about practices in the past.
502
503 # From Arthur David Olson (2011-08-17):
504 # For lack of better information, assume that Metlakatla's
505 # abandonment of use of daylight saving resulted from the 1983 vote.
506
507 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
508 Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
509 -8:57:41 - LMT 1900 Aug 20 12:00
510 -8:00 - PST 1942
511 -8:00 US P%sT 1946
512 -8:00 - PST 1969
513 -8:00 US P%sT 1980 Apr 27 2:00
514 -9:00 US Y%sT 1980 Oct 26 2:00
515 -8:00 US P%sT 1983 Oct 30 2:00
516 -9:00 US Y%sT 1983 Nov 30
517 -9:00 US AK%sT
518 Zone America/Sitka 14:58:47 - LMT 1867 Oct 18
519 -9:01:13 - LMT 1900 Aug 20 12:00
520 -8:00 - PST 1942
521 -8:00 US P%sT 1946
522 -8:00 - PST 1969
523 -8:00 US P%sT 1983 Oct 30 2:00
524 -9:00 US Y%sT 1983 Nov 30
525 -9:00 US AK%sT
526 Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18
527 -8:46:18 - LMT 1900 Aug 20 12:00
528 -8:00 - PST 1942
529 -8:00 US P%sT 1946
530 -8:00 - PST 1969
531 -8:00 US P%sT 1983 Oct 30 2:00
532 -8:00 - PST
533 Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
534 -9:18:55 - LMT 1900 Aug 20 12:00
535 -9:00 - YST 1942
536 -9:00 US Y%sT 1946
537 -9:00 - YST 1969
538 -9:00 US Y%sT 1983 Nov 30
539 -9:00 US AK%sT
540 Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
541 -9:59:36 - LMT 1900 Aug 20 12:00
542 -10:00 - CAT 1942
543 -10:00 US CAT/CAWT 1945 Aug 14 23:00u
544 -10:00 US CAT/CAPT 1946 # Peace
545 -10:00 - CAT 1967 Apr
546 -10:00 - AHST 1969
547 -10:00 US AH%sT 1983 Oct 30 2:00
548 -9:00 US Y%sT 1983 Nov 30
549 -9:00 US AK%sT
550 Zone America/Nome 12:58:21 - LMT 1867 Oct 18
551 -11:01:38 - 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 -9:00 US Y%sT 1983 Nov 30
558 -9:00 US AK%sT
559 Zone America/Adak 12:13:21 - LMT 1867 Oct 18
560 -11:46:38 - LMT 1900 Aug 20 12:00
561 -11:00 - NST 1942
562 -11:00 US N%sT 1946
563 -11:00 - NST 1967 Apr
564 -11:00 - BST 1969
565 -11:00 US B%sT 1983 Oct 30 2:00
566 -10:00 US AH%sT 1983 Nov 30
567 -10:00 US H%sT
568 # The following switches don't quite make our 1970 cutoff.
569 #
570 # Shanks writes that part of southwest Alaska (e.g. Aniak)
571 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
572 # and another part (e.g. Akiak) made the same switch five weeks later.
573 #
574 # From David Flater (2004-11-09):
575 # In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
576 # Historic Preservation Commission, provided this information, which
577 # suggests that Unalaska deviated from statutory time from early 1967
578 # possibly until 1983:
579 #
580 # Minutes of the Unalaska City Council Meeting, January 10, 1967:
581 # "Except for St. Paul and Akutan, Unalaska is the only important
582 # location not on Alaska Standard Time. The following resolution was
583 # made by William Robinson and seconded by Henry Swanson: Be it
584 # resolved that the City of Unalaska hereby goes to Alaska Standard
585 # Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
586 # January 14, Alaska Standard Time.) This resolution was passed with
587 # three votes for and one against."
588
589 # Hawaii
590
591 # From Arthur David Olson (2010-12-09):
592 # "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225
593 # of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09,
594 # the article is available at
595 # http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf
596 # and indicates that standard time was adopted effective noon, January
597 # 13, 1896 (page 218), that in "1933, the Legislature decreed daylight
598 # saving for the period between the last Sunday of each April and the
599 # last Sunday of each September, but less than a month later repealed the
600 # act," (page 220), that year-round daylight saving time was in effect
601 # from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for
602 # when clocks changed) and that clocks were changed by 30 minutes
603 # effective the second Sunday of June, 1947 (page 219, with no time of
604 # day given for when clocks changed). A footnote for the 1933 changes
605 # cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933)
606 # and Act 163 (approved 21 May 1933)."
607
608 # From Arthur David Olson (2011-01-19):
609 # The following is from "Laws of the Territory of Hawaii Passed by the
610 # Seventeenth Legislature: Regular Session 1933," available (as of
611 # 2011-01-19) at American University's Pence Law Library. Page 85: "Act
612 # 90...At 2 o'clock ante meridian of the last Sunday in April of each
613 # year, the standard time of this Territory shall be advanced one
614 # hour...This Act shall take effect upon its approval. Approved this 26th
615 # day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
616 # Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is
617 # hereby repealed...This Act shall take effect upon its approval, upon
618 # which date the standard time of this Territory shall be restored to
619 # that existing immediately prior to the taking effect of said Act 90.
620 # Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
621 # of the Territory of Hawaii."
622 #
623 # Note that 1933-05-21 was a Sunday.
624 # We're left to guess the time of day when Act 163 was approved; guess noon.
625
626 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
627 Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00
628 -10:30 - HST 1933 Apr 30 2:00
629 -10:30 1:00 HDT 1933 May 21 12:00
630 -10:30 - HST 1942 Feb 9 2:00
631 -10:30 1:00 HDT 1945 Sep 30 2:00
632 -10:30 - HST 1947 Jun 8 2:00
633 -10:00 - HST
634 Link Pacific/Honolulu Pacific/Johnston
635
636 # Now we turn to US areas that have diverged from the consensus since 1970.
637
638 # Arizona mostly uses MST.
639
640 # From Paul Eggert (2002-10-20):
641 #
642 # The information in the rest of this paragraph is derived from the
643 # Daylight Saving Time web page
644 # <http://www.dlapr.lib.az.us/links/daylight.htm> (2002-01-23)
645 # maintained by the Arizona State Library, Archives and Public Records.
646 # Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
647 # time, but by federal law railroads, airlines, bus lines, military
648 # personnel, and some engaged in interstate commerce continued to
649 # observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
650 # Gazette says that was the date the law changed, and that 04-01 was
651 # the date the state's clocks would change. In 1945 the State of
652 # Arizona used standard time all year, again with exceptions only as
653 # mandated by federal law. Arizona observed DST in 1967, but Arizona
654 # Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
655 #
656 # Shanks says the 1944 experiment came to an end on 1944-03-17.
657 # Go with the Arizona State Library instead.
658
659 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
660 Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42
661 -7:00 US M%sT 1944 Jan 1 0:01
662 -7:00 - MST 1944 Apr 1 0:01
663 -7:00 US M%sT 1944 Oct 1 0:01
664 -7:00 - MST 1967
665 -7:00 US M%sT 1968 Mar 21
666 -7:00 - MST
667 # From Arthur David Olson (1988-02-13):
668 # A writer from the Inter Tribal Council of Arizona, Inc.,
669 # notes in private correspondence dated 1987-12-28 that "Presently, only the
670 # Navajo Nation participates in the Daylight Saving Time policy, due to its
671 # large size and location in three states." (The "only" means that other
672 # tribal nations don't use DST.)
673 #
674 # From Paul Eggert (2013-08-26):
675 # See America/Denver for a zone appropriate for the Navajo Nation.
676
677 # Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
678 # Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
679 # Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
680 # Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
681 # Teton, Twin Falls, Valley, Washington counties, and the southern
682 # quarter of Idaho county) and eastern Oregon (most of Malheur County)
683 # switched four weeks late in 1974.
684 #
685 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
686 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
687 -8:00 US P%sT 1923 May 13 2:00
688 -7:00 US M%sT 1974
689 -7:00 - MST 1974 Feb 3 2:00
690 -7:00 US M%sT
691
692 # Indiana
693 #
694 # For a map of Indiana's time zone regions, see:
695 # http://en.wikipedia.org/wiki/Time_in_Indiana
696 #
697 # From Paul Eggert (2007-08-17):
698 # Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
699 # with the following exceptions:
700 #
701 # - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
702 # Vanderburgh, and Warrick counties have been like America/Chicago.
703 #
704 # - Dearborn and Ohio counties have been like America/New_York.
705 #
706 # - Clark, Floyd, and Harrison counties have been like
707 # America/Kentucky/Louisville.
708 #
709 # - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
710 # and Switzerland counties have their own time zone histories as noted below.
711 #
712 # Shanks partitioned Indiana into 345 regions, each with its own time history,
713 # and wrote "Even newspaper reports present contradictory information."
714 # Those Hoosiers! Such a flighty and changeable people!
715 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
716 #
717 # Other than Indianapolis, the Indiana place names are so nondescript
718 # that they would be ambiguous if we left them at the 'America' level.
719 # So we reluctantly put them all in a subdirectory 'America/Indiana'.
720
721 # From Paul Eggert (2014-06-26):
722 # https://www.federalregister.gov/articles/2006/01/20/06-563/standard-time-zone-boundary-in-the-state-of-indiana
723 # 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 a.m. EST Sunday, April 2, 2006, which is the
727 # changeover date from standard time to Daylight Saving Time."
728 # Strictly speaking, this meant the affected counties changed their
729 # clocks twice that night, but this obviously was in error. The intent
730 # was 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 Lake Cumberland LIFE
903 # http://www.lake-cumberland.com/life/archive/news990129time.shtml
904 # (1999-01-29) via WKYM-101.7:
905 # Clinton County has joined Wayne County in asking the DoT to change from
906 # the Central to the Eastern time zone.... The Wayne County government made
907 # the same request in December. And while Russell County officials have not
908 # taken action, the majority of respondents to a poll conducted there in
909 # August indicated they would like to change to "fast time" also.
910 # The three Lake Cumberland counties are the farthest east of any U.S.
911 # location in the Central time zone.
912 #
913 # From Rich Wales (2000-08-29):
914 # After prolonged debate, and despite continuing deep differences of opinion,
915 # Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
916 # (-0500) time. They won't "fall back" this year. See Sara Shipley,
917 # The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
918 #
919 # From Paul Eggert (2001-07-16):
920 # The final rule was published in the
921 # Federal Register 65, 160 (2000-08-17), pp 50154-50158.
922 # http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22
923 #
924 Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
925 -6:00 US C%sT 1946
926 -6:00 - CST 1968
927 -6:00 US C%sT 2000 Oct 29 2:00
928 -5:00 US E%sT
929
930
931 # From Rives McDow (2000-08-30):
932 # Here ... are all the changes in the US since 1985.
933 # Kearny County, KS (put all of county on central;
934 # previously split between MST and CST) ... 1990-10
935 # Starke County, IN (from CST to EST) ... 1991-10
936 # Oliver County, ND (from MST to CST) ... 1992-10
937 # West Wendover, NV (from PST TO MST) ... 1999-10
938 # Wayne County, KY (from CST to EST) ... 2000-10
939 #
940 # From Paul Eggert (2001-07-17):
941 # We don't know where the line used to be within Kearny County, KS,
942 # so omit that change for now.
943 # See America/Indiana/Knox for the Starke County, IN change.
944 # See America/North_Dakota/Center for the Oliver County, ND change.
945 # West Wendover, NV officially switched from Pacific to mountain time on
946 # 1999-10-31. See the
947 # Federal Register 64, 203 (1999-10-21), pp 56705-56707.
948 # http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15
949 # However, the Federal Register says that West Wendover already operated
950 # on mountain time, and the rule merely made this official;
951 # hence a separate tz entry is not needed.
952
953 # Michigan
954 #
955 # From Bob Devine (1988-01-28):
956 # Michigan didn't observe DST from 1968 to 1973.
957 #
958 # From Paul Eggert (1999-03-31):
959 # Shanks writes that Michigan started using standard time on 1885-09-18,
960 # but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
961 # that Detroit kept
962 #
963 # local time until 1900 when the City Council decreed that clocks should
964 # be put back twenty-eight minutes to Central Standard Time. Half the
965 # city obeyed, half refused. After considerable debate, the decision
966 # was rescinded and the city reverted to Sun time. A derisive offer to
967 # erect a sundial in front of the city hall was referred to the
968 # Committee on Sewers. Then, in 1905, Central time was adopted
969 # by city vote.
970 #
971 # This story is too entertaining to be false, so go with Howse over Shanks.
972 #
973 # From Paul Eggert (2001-03-06):
974 # Garland (1927) writes "Cleveland and Detroit advanced their clocks
975 # one hour in 1914." This change is not in Shanks. We have no more
976 # info, so omit this for now.
977 #
978 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
979 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
980 Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
981 Rule Detroit 1948 only - Sep lastSun 2:00 0 S
982 Rule Detroit 1967 only - Jun 14 2:00 1:00 D
983 Rule Detroit 1967 only - Oct lastSun 2:00 0 S
984 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
985 Zone America/Detroit -5:32:11 - LMT 1905
986 -6:00 - CST 1915 May 15 2:00
987 -5:00 - EST 1942
988 -5:00 US E%sT 1946
989 -5:00 Detroit E%sT 1973
990 -5:00 US E%sT 1975
991 -5:00 - EST 1975 Apr 27 2:00
992 -5:00 US E%sT
993 #
994 # Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
995 # switched from EST to CST/CDT in 1973.
996 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
997 Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
998 Rule Menominee 1946 only - Sep lastSun 2:00 0 S
999 Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
1000 Rule Menominee 1966 only - Oct lastSun 2:00 0 S
1001 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1002 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
1003 -6:00 US C%sT 1946
1004 -6:00 Menominee C%sT 1969 Apr 27 2:00
1005 -5:00 - EST 1973 Apr 29 2:00
1006 -6:00 US C%sT
1007
1008 # Navassa
1009 # administered by the US Fish and Wildlife Service
1010 # claimed by US under the provisions of the 1856 Guano Islands Act
1011 # also claimed by Haiti
1012 # occupied 1857/1900 by the Navassa Phosphate Co
1013 # US lighthouse 1917/1996-09
1014 # currently uninhabited
1015 # see Mark Fineman, "An Isle Rich in Guano and Discord",
1016 # _Los Angeles Times_ (1998-11-10), A1, A10; it cites
1017 # Jimmy Skaggs, _The Great Guano Rush_ (1994).
1018
1019 ################################################################################
1020
1021
1022 # From Paul Eggert (2014-10-31):
1023 #
1024 # Unless otherwise specified, the source for data through 1990 is:
1025 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
1026 # San Diego: ACS Publications, Inc. (2003).
1027 # Unfortunately this book contains many errors and cites no sources.
1028 #
1029 # Gwillim Law writes that a good source
1030 # for recent time zone data is the International Air Transport
1031 # Association's Standard Schedules Information Manual (IATA SSIM),
1032 # published semiannually. Law sent in several helpful summaries
1033 # of the IATA's data after 1990. Except where otherwise noted,
1034 # IATA SSIM is the source for entries after 1990.
1035 #
1036 # Other sources occasionally used include:
1037 #
1038 # Edward W. Whitman, World Time Differences,
1039 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
1040 # which I found in the UCLA library.
1041 #
1042 # William Willett, The Waste of Daylight, 19th edition
1043 # <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf>
1044 # [PDF] (1914-03)
1045 #
1046 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
1047 # <http://www.jstor.org/stable/1774359>.
1048 #
1049 # See the 'europe' file for Greenland.
1050
1051 # Canada
1052
1053 # From Alain LaBonté (1994-11-14):
1054 # I post here the time zone abbreviations standardized in Canada
1055 # for both English and French in the CAN/CSA-Z234.4-89 standard....
1056 #
1057 # UTC Standard time Daylight saving time
1058 # offset French English French English
1059 # -2:30 - - HAT NDT
1060 # -3 - - HAA ADT
1061 # -3:30 HNT NST - -
1062 # -4 HNA AST HAE EDT
1063 # -5 HNE EST HAC CDT
1064 # -6 HNC CST HAR MDT
1065 # -7 HNR MST HAP PDT
1066 # -8 HNP PST HAY YDT
1067 # -9 HNY YST - -
1068 #
1069 # HN: Heure Normale ST: Standard Time
1070 # HA: Heure Avancée DT: Daylight saving Time
1071 #
1072 # A: de l'Atlantique Atlantic
1073 # C: du Centre Central
1074 # E: de l'Est Eastern
1075 # M: Mountain
1076 # N: Newfoundland
1077 # P: du Pacifique Pacific
1078 # R: des Rocheuses
1079 # T: de Terre-Neuve
1080 # Y: du Yukon Yukon
1081 #
1082 # From Paul Eggert (1994-11-22):
1083 # Alas, this sort of thing must be handled by localization software.
1084
1085 # Unless otherwise specified, the data entries for Canada are all from Shanks
1086 # & Pottenger.
1087
1088 # From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
1089 # 2007-03-01):
1090 # The British Columbia government announced yesterday that it will
1091 # adjust daylight savings next year to align with changes in the
1092 # U.S. and the rest of Canada....
1093 # http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
1094 # ...
1095 # Nova Scotia
1096 # Daylight saving time will be extended by four weeks starting in 2007....
1097 # http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf
1098 #
1099 # [For New Brunswick] the new legislation dictates that the time change is to
1100 # be done at 02:00 instead of 00:01.
1101 # http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
1102 # ...
1103 # Manitoba has traditionally changed the clock every fall at 03:00.
1104 # As of 2006, the transition is to take place one hour earlier at 02:00.
1105 # http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
1106 # ...
1107 # [Alberta, Ontario, Quebec] will follow US rules.
1108 # http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
1109 # http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
1110 # http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
1111 # ...
1112 # P.E.I. will follow US rules....
1113 # http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
1114 # ...
1115 # Province of Newfoundland and Labrador....
1116 # http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
1117 # ...
1118 # Yukon
1119 # http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
1120 # ...
1121 # N.W.T. will follow US rules. Whoever maintains the government web site
1122 # does not seem to believe in bookmarks. To see the news release, click the
1123 # following link and search for "Daylight Savings Time Change". Press the
1124 # "Daylight Savings Time Change" link; it will fire off a popup using
1125 # JavaScript.
1126 # http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
1127 # ...
1128 # Nunavut
1129 # An amendment to the Interpretation Act was registered on February 19/2007....
1130 # http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
1131
1132 # From Paul Eggert (2014-10-18):
1133 # H. David Matthews and Mary Vincent's map
1134 # "It's about TIME", _Canadian Geographic_ (September-October 1998)
1135 # http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp
1136 # contains detailed boundaries for regions observing nonstandard
1137 # time and daylight saving time arrangements in Canada circa 1998.
1138 #
1139 # National Research Council Canada maintains info about time zones and DST.
1140 # http://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html
1141 # http://www.nrc-cnrc.gc.ca/eng/services/time/faq/index.html#Q5
1142 # Its unofficial information is often taken from Matthews and Vincent.
1143
1144 # From Paul Eggert (2006-06-27):
1145 # For now, assume all of DST-observing Canada will fall into line with the
1146 # new US DST rules,
1147
1148 # From Chris Walton (2011-12-01)
1149 # In the first of Tammy Hardwick's articles
1150 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1151 # she quotes the Friday November 1/1918 edition of the Creston Review.
1152 # The quote includes these two statements:
1153 # 'Sunday the CPR went back to the old system of time...'
1154 # '... The daylight saving scheme was dropped all over Canada at the same time,'
1155 # These statements refer to a transition from daylight time to standard time
1156 # that occurred nationally on Sunday October 27/1918. This transition was
1157 # also documented in the Saturday October 26/1918 edition of the Toronto Star.
1158
1159 # In light of that evidence, we alter the date from the earlier believed
1160 # Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day
1161 # than Thursday) in all Canadian rulesets.
1162
1163 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1164 Rule Canada 1918 only - Apr 14 2:00 1:00 D
1165 Rule Canada 1918 only - Oct 27 2:00 0 S
1166 Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
1167 Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
1168 Rule Canada 1945 only - Sep 30 2:00 0 S
1169 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
1170 Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
1171 Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D
1172 Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D
1173 Rule Canada 2007 max - Nov Sun>=1 2:00 0 S
1174
1175
1176 # Newfoundland and Labrador
1177
1178 # From Paul Eggert (2000-10-02):
1179 # Matthews and Vincent (1998) write that Labrador should use NST/NDT,
1180 # but the only part of Labrador that follows the rules is the
1181 # southeast corner, including Port Hope Simpson and Mary's Harbour,
1182 # but excluding, say, Black Tickle.
1183
1184 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1185 Rule StJohns 1917 only - Apr 8 2:00 1:00 D
1186 Rule StJohns 1917 only - Sep 17 2:00 0 S
1187 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
1188 Rule StJohns 1919 only - May 5 23:00 1:00 D
1189 Rule StJohns 1919 only - Aug 12 23:00 0 S
1190 # For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
1191 Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
1192 Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
1193 # For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
1194 # Pottenger.
1195 Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
1196 Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
1197 # Whitman gives the following transitions:
1198 # 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
1199 # but go with Shanks & Pottenger and assume they used Canadian rules.
1200 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
1201 # Apr 30 - Sep 24; go with Shanks & Pottenger.
1202 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
1203 Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
1204 Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
1205 Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
1206 Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
1207 # From Paul Eggert (2000-10-02):
1208 # INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
1209 # at 00:01 local time. For now, assume it started in 1987.
1210
1211 # From Michael Pelley (2011-09-12):
1212 # We received today, Monday, September 12, 2011, notification that the
1213 # changes to the Newfoundland Standard Time Act have been proclaimed.
1214 # The change in the Act stipulates that the change from Daylight Savings
1215 # Time to Standard Time and from Standard Time to Daylight Savings Time
1216 # now occurs at 2:00AM.
1217 # ...
1218 # http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm
1219 # ...
1220 # MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery
1221 # Office of the Chief Information Officer
1222 # Executive Council
1223 # Government of Newfoundland & Labrador
1224
1225 Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
1226 Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S
1227 Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
1228 Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D
1229 Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D
1230 Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S
1231 #
1232 # St John's has an apostrophe, but Posix file names can't have apostrophes.
1233 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1234 Zone America/St_Johns -3:30:52 - LMT 1884
1235 -3:30:52 StJohns N%sT 1918
1236 -3:30:52 Canada N%sT 1919
1237 -3:30:52 StJohns N%sT 1935 Mar 30
1238 -3:30 StJohns N%sT 1942 May 11
1239 -3:30 Canada N%sT 1946
1240 -3:30 StJohns N%sT 2011 Nov
1241 -3:30 Canada N%sT
1242
1243 # most of east Labrador
1244
1245 # The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'.
1246 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1247 Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
1248 -3:30:52 - NST 1918
1249 -3:30:52 Canada N%sT 1919
1250 -3:30:52 - NST 1935 Mar 30
1251 -3:30 - NST 1936
1252 -3:30 StJohns N%sT 1942 May 11
1253 -3:30 Canada N%sT 1946
1254 -3:30 StJohns N%sT 1966 Mar 15 2:00
1255 -4:00 StJohns A%sT 2011 Nov
1256 -4:00 Canada A%sT
1257
1258
1259 # west Labrador, Nova Scotia, Prince Edward I
1260
1261 # From Paul Eggert (2006-03-22):
1262 # Shanks & Pottenger write that since 1970 most of this region has been like
1263 # Halifax. Many locales did not observe peacetime DST until 1972;
1264 # Glace Bay, NS is the largest that we know of.
1265 # Shanks & Pottenger also write that Liverpool, NS was the only town
1266 # in Canada to observe DST in 1971 but not 1970; for now we'll assume
1267 # this is a typo.
1268
1269 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1270 Rule Halifax 1916 only - Apr 1 0:00 1:00 D
1271 Rule Halifax 1916 only - Oct 1 0:00 0 S
1272 Rule Halifax 1920 only - May 9 0:00 1:00 D
1273 Rule Halifax 1920 only - Aug 29 0:00 0 S
1274 Rule Halifax 1921 only - May 6 0:00 1:00 D
1275 Rule Halifax 1921 1922 - Sep 5 0:00 0 S
1276 Rule Halifax 1922 only - Apr 30 0:00 1:00 D
1277 Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
1278 Rule Halifax 1923 only - Sep 4 0:00 0 S
1279 Rule Halifax 1924 only - Sep 15 0:00 0 S
1280 Rule Halifax 1925 only - Sep 28 0:00 0 S
1281 Rule Halifax 1926 only - May 16 0:00 1:00 D
1282 Rule Halifax 1926 only - Sep 13 0:00 0 S
1283 Rule Halifax 1927 only - May 1 0:00 1:00 D
1284 Rule Halifax 1927 only - Sep 26 0:00 0 S
1285 Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
1286 Rule Halifax 1928 only - Sep 9 0:00 0 S
1287 Rule Halifax 1929 only - Sep 3 0:00 0 S
1288 Rule Halifax 1930 only - Sep 15 0:00 0 S
1289 Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
1290 Rule Halifax 1932 only - May 1 0:00 1:00 D
1291 Rule Halifax 1933 only - Apr 30 0:00 1:00 D
1292 Rule Halifax 1933 only - Oct 2 0:00 0 S
1293 Rule Halifax 1934 only - May 20 0:00 1:00 D
1294 Rule Halifax 1934 only - Sep 16 0:00 0 S
1295 Rule Halifax 1935 only - Jun 2 0:00 1:00 D
1296 Rule Halifax 1935 only - Sep 30 0:00 0 S
1297 Rule Halifax 1936 only - Jun 1 0:00 1:00 D
1298 Rule Halifax 1936 only - Sep 14 0:00 0 S
1299 Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
1300 Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
1301 Rule Halifax 1939 only - May 28 0:00 1:00 D
1302 Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
1303 Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D
1304 Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S
1305 Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D
1306 Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S
1307 Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D
1308 Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S
1309 Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D
1310 Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S
1311 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1312 Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
1313 -4:00 Halifax A%sT 1918
1314 -4:00 Canada A%sT 1919
1315 -4:00 Halifax A%sT 1942 Feb 9 2:00s
1316 -4:00 Canada A%sT 1946
1317 -4:00 Halifax A%sT 1974
1318 -4:00 Canada A%sT
1319 Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
1320 -4:00 Canada A%sT 1953
1321 -4:00 Halifax A%sT 1954
1322 -4:00 - AST 1972
1323 -4:00 Halifax A%sT 1974
1324 -4:00 Canada A%sT
1325
1326 # New Brunswick
1327
1328 # From Paul Eggert (2007-01-31):
1329 # The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf>
1330 # says they changed at 00:01 through 2006, and
1331 # <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it
1332 # clear that this was the case since at least 1993.
1333 # For now, assume it started in 1993.
1334
1335 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1336 Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D
1337 Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S
1338 Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D
1339 Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S
1340 Rule Moncton 1939 only - May 27 1:00 1:00 D
1341 Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S
1342 Rule Moncton 1940 only - May 19 1:00 1:00 D
1343 Rule Moncton 1941 only - May 4 1:00 1:00 D
1344 Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D
1345 Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S
1346 Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S
1347 Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D
1348 Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S
1349 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1350 Zone America/Moncton -4:19:08 - LMT 1883 Dec 9
1351 -5:00 - EST 1902 Jun 15
1352 -4:00 Canada A%sT 1933
1353 -4:00 Moncton A%sT 1942
1354 -4:00 Canada A%sT 1946
1355 -4:00 Moncton A%sT 1973
1356 -4:00 Canada A%sT 1993
1357 -4:00 Moncton A%sT 2007
1358 -4:00 Canada A%sT
1359
1360 # Quebec
1361
1362 # From Paul Eggert (2015-03-24):
1363 # See America/Toronto for most of Quebec, including Montreal.
1364 #
1365 # Matthews and Vincent (1998) also write that Quebec east of the -63
1366 # meridian is supposed to observe AST, but residents as far east as
1367 # Natashquan use EST/EDT, and residents east of Natashquan use AST.
1368 # The Quebec department of justice writes in
1369 # "The situation in Minganie and Basse-Côte-Nord"
1370 # http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm
1371 # that the coastal strip from just east of Natashquan to Blanc-Sablon
1372 # observes Atlantic standard time all year round.
1373 # http://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en
1374 # says this common practice was codified into law as of 2007.
1375 # For lack of better info, guess this practice began around 1970, contra to
1376 # Shanks & Pottenger who have this region observing AST/ADT.
1377
1378 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1379 Zone America/Blanc-Sablon -3:48:28 - LMT 1884
1380 -4:00 Canada A%sT 1970
1381 -4:00 - AST
1382
1383 # Ontario
1384
1385 # From Paul Eggert (2006-07-09):
1386 # Shanks & Pottenger write that since 1970 most of Ontario has been like
1387 # Toronto.
1388 # Thunder Bay skipped DST in 1973.
1389 # Many smaller locales did not observe peacetime DST until 1974;
1390 # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1391 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
1392
1393 # From Mark Brader (2003-07-26):
1394 # [According to the Toronto Star] Orillia, Ontario, adopted DST
1395 # effective Saturday, 1912-06-22, 22:00; the article mentions that
1396 # Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
1397 # have already done so. In Orillia DST was to run until Saturday,
1398 # 1912-08-31 (no time mentioned), but it was met with considerable
1399 # hostility from certain segments of the public, and was revoked after
1400 # only two weeks - I copied it as Saturday, 1912-07-07, 22:00, but
1401 # presumably that should be -07-06. (1912-06-19, -07-12; also letters
1402 # earlier in June).
1403 #
1404 # Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
1405
1406 # From Paul Eggert (1997-10-17):
1407 # Mark Brader writes that an article in the 1997-10-14 Toronto Star
1408 # says that Atikokan, Ontario currently does not observe DST,
1409 # but will vote on 11-10 whether to use EST/EDT.
1410 # He also writes that the Ontario Time Act (1990, Chapter T.9)
1411 # http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html
1412 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
1413 # Officially Atikokan is therefore on CST/CDT, and most likely this report
1414 # concerns a non-official time observed as a matter of local practice.
1415 #
1416 # From Paul Eggert (2000-10-02):
1417 # Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
1418 # New Osnaburgh observe CST all year, that Big Trout Lake observes
1419 # CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
1420 # violation of the official Ontario rules.
1421 #
1422 # From Paul Eggert (2006-07-09):
1423 # Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
1424 # 2005-07-21 Chronicle-Journal, which said:
1425 #
1426 # The clocks in Atikokan stay set on standard time year-round.
1427 # This means they spend about half the time on central time and
1428 # the other half on eastern time.
1429 #
1430 # For the most part, the system works, Mayor Dennis Brown said.
1431 #
1432 # "The majority of businesses in Atikokan deal more with Eastern
1433 # Canada, but there are some that deal with Western Canada," he
1434 # said. "I don't see any changes happening here."
1435 #
1436 # Walton also writes "Supposedly Pickle Lake and Mishkeegogamang
1437 # [New Osnaburgh] follow the same practice."
1438
1439 # From Garry McKinnon (2006-07-14) via Chris Walton:
1440 # I chatted with a member of my board who has an outstanding memory
1441 # and a long history in Atikokan (and in the telecom industry) and he
1442 # can say for certain that Atikokan has been practicing the current
1443 # time keeping since 1952, at least.
1444
1445 # From Paul Eggert (2006-07-17):
1446 # Shanks & Pottenger say that Atikokan has agreed with Rainy River
1447 # ever since standard time was introduced, but the information from
1448 # McKinnon sounds more authoritative. For now, assume that Atikokan
1449 # switched to EST immediately after WWII era daylight saving time
1450 # ended. This matches the old (less-populous) America/Coral_Harbour
1451 # entry since our cutoff date of 1970, so we can move
1452 # America/Coral_Harbour to the 'backward' file.
1453
1454 # From Mark Brader (2010-03-06):
1455 #
1456 # Currently the database has:
1457 #
1458 # # Ontario
1459 #
1460 # # From Paul Eggert (2006-07-09):
1461 # # Shanks & Pottenger write that since 1970 most of Ontario has been like
1462 # # Toronto.
1463 # # Thunder Bay skipped DST in 1973.
1464 # # Many smaller locales did not observe peacetime DST until 1974;
1465 # # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1466 #
1467 # In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom
1468 # right corner of page 1, it says that Toronto will return to standard
1469 # time at 2 am Sunday morning (which agrees with the database), and that:
1470 #
1471 # The one-hour setback will go into effect throughout most of Ontario,
1472 # except in areas like Windsor which remains on standard time all year.
1473 #
1474 # Windsor is, of course, a lot larger than Nipigon.
1475 #
1476 # I only came across this incidentally. I don't know if Windsor began
1477 # observing DST when Detroit did, or in 1974, or on some other date.
1478 #
1479 # By the way, the article continues by noting that:
1480 #
1481 # Some cities in the United States have pushed the deadline back
1482 # three weeks and will change over from daylight saving in October.
1483
1484 # From Arthur David Olson (2010-07-17):
1485 #
1486 # "Standard Time and Time Zones in Canada" appeared in
1487 # The Journal of The Royal Astronomical Society of Canada,
1488 # volume 26, number 2 (February 1932) and, as of 2010-07-17,
1489 # was available at
1490 # http://adsabs.harvard.edu/full/1932JRASC..26...49S
1491 #
1492 # It includes the text below (starting on page 57):
1493 #
1494 # A list of the places in Canada using daylight saving time would
1495 # require yearly revision. From information kindly furnished by
1496 # the provincial governments and by the postmasters in many cities
1497 # and towns, it is found that the following places used daylight sav-
1498 # ing in 1930. The information for the province of Quebec is definite,
1499 # for the other provinces only approximate:
1500 #
1501 # Province Daylight saving time used
1502 # Prince Edward Island Not used.
1503 # Nova Scotia In Halifax only.
1504 # New Brunswick In St. John only.
1505 # Quebec In the following places:
1506 # Montreal Lachine
1507 # Quebec Mont-Royal
1508 # Lévis Iberville
1509 # St. Lambert Cap de la Madelèine
1510 # Verdun Loretteville
1511 # Westmount Richmond
1512 # Outremont St. Jérôme
1513 # Longueuil Greenfield Park
1514 # Arvida Waterloo
1515 # Chambly-Canton Beaulieu
1516 # Melbourne La Tuque
1517 # St. Théophile Buckingham
1518 # Ontario Used generally in the cities and towns along
1519 # the southerly part of the province. Not
1520 # used in the northwesterly part.
1521 # Manitoba Not used.
1522 # Saskatchewan In Regina only.
1523 # Alberta Not used.
1524 # British Columbia Not used.
1525 #
1526 # With some exceptions, the use of daylight saving may be said to be limited
1527 # to those cities and towns lying between Quebec city and Windsor, Ont.
1528
1529 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1530 Rule Toronto 1919 only - Mar 30 23:30 1:00 D
1531 Rule Toronto 1919 only - Oct 26 0:00 0 S
1532 Rule Toronto 1920 only - May 2 2:00 1:00 D
1533 Rule Toronto 1920 only - Sep 26 0:00 0 S
1534 Rule Toronto 1921 only - May 15 2:00 1:00 D
1535 Rule Toronto 1921 only - Sep 15 2:00 0 S
1536 Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
1537 # Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
1538 # was meant.
1539 Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
1540 Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
1541 # The 1927-to-1939 rules can be expressed more simply as
1542 # Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S
1543 # Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D
1544 # Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D
1545 # Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S
1546 # The rules below avoid use of Sun>=25
1547 # (which pre-2004 versions of zic cannot handle).
1548 Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S
1549 Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D
1550 Rule Toronto 1932 only - May 1 2:00 1:00 D
1551 Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D
1552 Rule Toronto 1933 only - Oct 1 2:00 0 S
1553 Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S
1554 Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S
1555 Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D
1556 Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D
1557 Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S
1558 Rule Toronto 1949 only - Nov lastSun 0:00 0 S
1559 Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D
1560 Rule Toronto 1950 only - Nov lastSun 2:00 0 S
1561 Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S
1562 # Shanks & Pottenger say Toronto ended DST a week early in 1971,
1563 # namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this
1564 # is wrong, and that he had confirmed it by checking the 1971-10-30
1565 # Toronto Star, which said that DST was ending 1971-10-31 as usual.
1566 Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S
1567
1568 # From Paul Eggert (2003-07-27):
1569 # Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
1570 # Port Arthur, Ontario, the principle of the Bill has been in
1571 # operation for the past three years, and in the City of Moose Jaw,
1572 # Saskatchewan, for one year."
1573
1574 # From David Bryan via Tory Tronrud, Director/Curator,
1575 # Thunder Bay Museum (2003-11-12):
1576 # There is some suggestion, however, that, by-law or not, daylight
1577 # savings time was being practiced in Fort William and Port Arthur
1578 # before 1909.... [I]n 1910, the line between the Eastern and Central
1579 # Time Zones was permanently moved about two hundred miles west to
1580 # include the Thunder Bay area.... When Canada adopted daylight
1581 # savings time in 1916, Fort William and Port Arthur, having done so
1582 # already, did not change their clocks.... During the Second World
1583 # War,... [t]he cities agreed to implement DST during the summer
1584 # months for the remainder of the war years.
1585
1586 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1587 Zone America/Toronto -5:17:32 - LMT 1895
1588 -5:00 Canada E%sT 1919
1589 -5:00 Toronto E%sT 1942 Feb 9 2:00s
1590 -5:00 Canada E%sT 1946
1591 -5:00 Toronto E%sT 1974
1592 -5:00 Canada E%sT
1593 Zone America/Thunder_Bay -5:57:00 - LMT 1895
1594 -6:00 - CST 1910
1595 -5:00 - EST 1942
1596 -5:00 Canada E%sT 1970
1597 -5:00 Toronto E%sT 1973
1598 -5:00 - EST 1974
1599 -5:00 Canada E%sT
1600 Zone America/Nipigon -5:53:04 - LMT 1895
1601 -5:00 Canada E%sT 1940 Sep 29
1602 -5:00 1:00 EDT 1942 Feb 9 2:00s
1603 -5:00 Canada E%sT
1604 Zone America/Rainy_River -6:18:16 - LMT 1895
1605 -6:00 Canada C%sT 1940 Sep 29
1606 -6:00 1:00 CDT 1942 Feb 9 2:00s
1607 -6:00 Canada C%sT
1608 Zone America/Atikokan -6:06:28 - LMT 1895
1609 -6:00 Canada C%sT 1940 Sep 29
1610 -6:00 1:00 CDT 1942 Feb 9 2:00s
1611 -6:00 Canada C%sT 1945 Sep 30 2:00
1612 -5:00 - EST
1613
1614
1615 # Manitoba
1616
1617 # From Rob Douglas (2006-04-06):
1618 # the old Manitoba Time Act - as amended by Bill 2, assented to
1619 # March 27, 1987 ... said ...
1620 # "between two o'clock Central Standard Time in the morning of
1621 # the first Sunday of April of each year and two o'clock Central
1622 # Standard Time in the morning of the last Sunday of October next
1623 # following, one hour in advance of Central Standard Time."...
1624 # I believe that the English legislation [of the old time act] had
1625 # been assented to (March 22, 1967)....
1626 # Also, as far as I can tell, there was no order-in-council varying
1627 # the time of Daylight Saving Time for 2005 and so the provisions of
1628 # the 1987 version would apply - the changeover was at 2:00 Central
1629 # Standard Time (i.e. not until 3:00 Central Daylight Time).
1630
1631 # From Paul Eggert (2006-04-10):
1632 # Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
1633 # starting 1966. Since 02:00s is clearly correct for 1967 on, assume
1634 # it was also 02:00s in 1966.
1635
1636 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1637 Rule Winn 1916 only - Apr 23 0:00 1:00 D
1638 Rule Winn 1916 only - Sep 17 0:00 0 S
1639 Rule Winn 1918 only - Apr 14 2:00 1:00 D
1640 Rule Winn 1918 only - Oct 27 2:00 0 S
1641 Rule Winn 1937 only - May 16 2:00 1:00 D
1642 Rule Winn 1937 only - Sep 26 2:00 0 S
1643 Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
1644 Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
1645 Rule Winn 1945 only - Sep lastSun 2:00 0 S
1646 Rule Winn 1946 only - May 12 2:00 1:00 D
1647 Rule Winn 1946 only - Oct 13 2:00 0 S
1648 Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
1649 Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
1650 Rule Winn 1950 only - May 1 2:00 1:00 D
1651 Rule Winn 1950 only - Sep 30 2:00 0 S
1652 Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
1653 Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
1654 Rule Winn 1959 only - Oct lastSun 2:00 0 S
1655 Rule Winn 1960 only - Sep lastSun 2:00 0 S
1656 Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
1657 Rule Winn 1963 only - Sep 22 2:00 0 S
1658 Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D
1659 Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S
1660 Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D
1661 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1662 Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
1663 -6:00 Winn C%sT 2006
1664 -6:00 Canada C%sT
1665
1666
1667 # Saskatchewan
1668
1669 # From Mark Brader (2003-07-26):
1670 # The first actual adoption of DST in Canada was at the municipal
1671 # level. As the [Toronto] Star put it (1912-06-07), "While people
1672 # elsewhere have long been talking of legislation to save daylight,
1673 # the city of Moose Jaw [Saskatchewan] has acted on its own hook."
1674 # DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
1675 # presumably late evening, as below), and would run until "the end of
1676 # the summer". The discrepancy between municipal time and railroad
1677 # time was noted.
1678
1679 # From Paul Eggert (2003-07-27):
1680 # Willett (1914-03) notes that DST "has been in operation ... in the
1681 # City of Moose Jaw, Saskatchewan, for one year."
1682
1683 # From Paul Eggert (2006-03-22):
1684 # Shanks & Pottenger say that since 1970 this region has mostly been as Regina.
1685 # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
1686 # Other western towns (e.g. Lloydminster) are like Edmonton.
1687 # Matthews and Vincent (1998) write that Denare Beach and Creighton
1688 # are like Winnipeg, in violation of Saskatchewan law.
1689
1690 # From W. Jones (1992-11-06):
1691 # The. . .below is based on information I got from our law library, the
1692 # provincial archives, and the provincial Community Services department.
1693 # A precise history would require digging through newspaper archives, and
1694 # since you didn't say what you wanted, I didn't bother.
1695 #
1696 # Saskatchewan is split by a time zone meridian (105W) and over the years
1697 # the boundary became pretty ragged as communities near it reevaluated
1698 # their affiliations in one direction or the other. In 1965 a provincial
1699 # referendum favoured legislating common time practices.
1700 #
1701 # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
1702 # Saskatchewan 1978) was proclaimed, and established that the eastern
1703 # part of Saskatchewan would use CST year round, that districts in
1704 # northwest Saskatchewan would by default follow CST but could opt to
1705 # follow Mountain Time rules (thus 1 hour difference in the winter and
1706 # zero in the summer), and that districts in southwest Saskatchewan would
1707 # by default follow MT but could opt to follow CST.
1708 #
1709 # It took a few years for the dust to settle (I know one story of a town
1710 # on one time zone having its school in another, such that a mom had to
1711 # serve her family lunch in two shifts), but presently it seems that only
1712 # a few towns on the border with Alberta (e.g. Lloydminster) follow MT
1713 # rules any more; all other districts appear to have used CST year round
1714 # since sometime in the 1960s.
1715
1716 # From Chris Walton (2006-06-26):
1717 # The Saskatchewan time act which was last updated in 1996 is about 30 pages
1718 # long and rather painful to read.
1719 # http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf
1720
1721 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1722 Rule Regina 1918 only - Apr 14 2:00 1:00 D
1723 Rule Regina 1918 only - Oct 27 2:00 0 S
1724 Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
1725 Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
1726 Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
1727 Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
1728 Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
1729 Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
1730 Rule Regina 1942 only - Feb 9 2:00 1:00 W # War
1731 Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace
1732 Rule Regina 1945 only - Sep lastSun 2:00 0 S
1733 Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
1734 Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
1735 Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D
1736 Rule Regina 1947 1957 - Sep lastSun 2:00 0 S
1737 Rule Regina 1959 only - Apr lastSun 2:00 1:00 D
1738 Rule Regina 1959 only - Oct lastSun 2:00 0 S
1739 #
1740 Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
1741 Rule Swift 1957 only - Oct lastSun 2:00 0 S
1742 Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
1743 Rule Swift 1959 only - Oct lastSun 2:00 0 S
1744 Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
1745 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1746 Zone America/Regina -6:58:36 - LMT 1905 Sep
1747 -7:00 Regina M%sT 1960 Apr lastSun 2:00
1748 -6:00 - CST
1749 Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
1750 -7:00 Canada M%sT 1946 Apr lastSun 2:00
1751 -7:00 Regina M%sT 1950
1752 -7:00 Swift M%sT 1972 Apr lastSun 2:00
1753 -6:00 - CST
1754
1755
1756 # Alberta
1757
1758 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1759 Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
1760 Rule Edm 1918 only - Oct 27 2:00 0 S
1761 Rule Edm 1919 only - May 27 2:00 0 S
1762 Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
1763 Rule Edm 1920 only - Oct lastSun 2:00 0 S
1764 Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
1765 Rule Edm 1942 only - Feb 9 2:00 1:00 W # War
1766 Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace
1767 Rule Edm 1945 only - Sep lastSun 2:00 0 S
1768 Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
1769 Rule Edm 1947 only - Sep lastSun 2:00 0 S
1770 Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
1771 Rule Edm 1967 only - Oct lastSun 2:00 0 S
1772 Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
1773 Rule Edm 1969 only - Oct lastSun 2:00 0 S
1774 Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
1775 Rule Edm 1972 2006 - Oct lastSun 2:00 0 S
1776 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1777 Zone America/Edmonton -7:33:52 - LMT 1906 Sep
1778 -7:00 Edm M%sT 1987
1779 -7:00 Canada M%sT
1780
1781
1782 # British Columbia
1783
1784 # From Paul Eggert (2006-03-22):
1785 # Shanks & Pottenger write that since 1970 most of this region has
1786 # been like Vancouver.
1787 # Dawson Creek uses MST. Much of east BC is like Edmonton.
1788 # Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1789
1790 # It seems though that (re: Creston) is not entirely correct:
1791
1792 # From Chris Walton (2011-12-01):
1793 # There are two areas within the Canadian province of British Columbia
1794 # that do not currently observe daylight saving:
1795 # a) The Creston Valley (includes the town of Creston and surrounding area)
1796 # b) The eastern half of the Peace River Regional District
1797 # (includes the cities of Dawson Creek and Fort St. John)
1798
1799 # Earlier this year I stumbled across a detailed article about the time
1800 # keeping history of Creston; it was written by Tammy Hardwick who is the
1801 # manager of the Creston & District Museum. The article was written in May 2009.
1802 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1803 # According to the article, Creston has not changed its clocks since June 1918.
1804 # i.e. Creston has been stuck on UTC-7 for 93 years.
1805 # Dawson Creek, on the other hand, changed its clocks as recently as April 1972.
1806
1807 # Unfortunately the exact date for the time change in June 1918 remains
1808 # unknown and will be difficult to ascertain. I e-mailed Tammy a few months
1809 # ago to ask if Sunday June 2 was a reasonable guess. She said it was just
1810 # as plausible as any other date (in June). She also said that after writing
1811 # the article she had discovered another time change in 1916; this is the
1812 # subject of another article which she wrote in October 2010.
1813 # http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56
1814
1815 # Here is a summary of the three clock change events in Creston's history:
1816 # 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7)
1817 # Exact date unknown
1818 # 2. Oct 1916: switch to Pacific Standard Time (GMT-8)
1819 # Exact date in October unknown; Sunday October 1 is a reasonable guess.
1820 # 3. June 1918: switch to Pacific Daylight Time (GMT-7)
1821 # Exact date in June unknown; Sunday June 2 is a reasonable guess.
1822 # note#1:
1823 # On Oct 27/1918 when daylight saving ended in the rest of Canada,
1824 # Creston did not change its clocks.
1825 # note#2:
1826 # During WWII when the Federal Government legislated a mandatory clock change,
1827 # Creston did not oblige.
1828 # note#3:
1829 # There is no guarantee that Creston will remain on Mountain Standard Time
1830 # (UTC-7) forever.
1831 # The subject was debated at least once this year by the town Council.
1832 # http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html
1833
1834 # During a period WWII, summer time (Daylight saying) was mandatory in Canada.
1835 # In Creston, that was handled by shifting the area to PST (-8:00) then applying
1836 # summer time to cause the offset to be -7:00, the same as it had been before
1837 # the change. It can be argued that the timezone abbreviation during this
1838 # period should be PDT rather than MST, but that doesn't seem important enough
1839 # (to anyone) to further complicate the rules.
1840
1841 # The transition dates (and times) are guesses.
1842
1843 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1844 Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1845 Rule Vanc 1918 only - Oct 27 2:00 0 S
1846 Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
1847 Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
1848 Rule Vanc 1945 only - Sep 30 2:00 0 S
1849 Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1850 Rule Vanc 1946 only - Oct 13 2:00 0 S
1851 Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1852 Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S
1853 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1854 Zone America/Vancouver -8:12:28 - LMT 1884
1855 -8:00 Vanc P%sT 1987
1856 -8:00 Canada P%sT
1857 Zone America/Dawson_Creek -8:00:56 - LMT 1884
1858 -8:00 Canada P%sT 1947
1859 -8:00 Vanc P%sT 1972 Aug 30 2:00
1860 -7:00 - MST
1861 Zone America/Creston -7:46:04 - LMT 1884
1862 -7:00 - MST 1916 Oct 1
1863 -8:00 - PST 1918 Jun 2
1864 -7:00 - MST
1865
1866 # Northwest Territories, Nunavut, Yukon
1867
1868 # From Paul Eggert (2006-03-22):
1869 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1870 # Mathew Englander (1996-10-07) gives the following refs:
1871 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1872 # c. 7 defines Yukon standard time as UTC-9....
1873 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1874 # [http://canlii.ca/t/7vhg]
1875 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1876 # * O.I.C. 1980/02 established DST.
1877 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1878
1879 # From Brian Inglis (2015-04-14):
1880 #
1881 # I tried to trace the history of Yukon time and found the following
1882 # regulations, giving the reference title and URL if found, regulation name,
1883 # and relevant quote if available. Each regulation specifically revokes its
1884 # predecessor. The final reference is to the current Interpretation Act
1885 # authorizing and resulting from these regulatory changes.
1886 #
1887 # Only recent regulations were retrievable via Yukon government site search or
1888 # index, and only some via Canadian legal sources. Other sources used include
1889 # articles titled "Standard Time and Time Zones in Canada" from JRASC via ADS
1890 # Abstracts, cited by ADO for 1932 ..., and updated versions from 1958 and
1891 # 1970 quoted below; each article includes current extracts from provincial
1892 # and territorial ST and DST regulations at the end, summaries and details of
1893 # standard times and daylight saving time at many locations across Canada,
1894 # with time zone maps, tables and calculations for Canadian Sunrise, Sunset,
1895 # and LMST; they also cover many countries and global locations, with a chart
1896 # and table showing current Universal Time offsets, and may be useful as
1897 # another source of information for 1970 and earlier.
1898 #
1899 # * Standard Time and Time Zones in Canada; Smith, C.C.; JRASC, Vol. 26,
1900 # pp.49-77; February 1932; SAO/NASA Astrophysics Data System (ADS)
1901 # http://adsabs.harvard.edu/abs/1932JRASC..26...49S from p.75:
1902 # Yukon Interpretation Ordinance
1903 # Yukon standard time is the local mean time at the one hundred and
1904 # thirty-fifth meridian.
1905 #
1906 # * Standard Time and Time Zones in Canada; Smith, C.C.; Thomson, Malcolm M.;
1907 # JRASC, Vol. 52, pp.193-223; October 1958; SAO/NASA Astrophysics Data System
1908 # (ADS) http://adsabs.harvard.edu/abs/1958JRASC..52..193S from pp.220-1:
1909 # Yukon Interpretation Ordinance, 1955, Chap. 16.
1910 #
1911 # (1) Subject to this section, standard time shall be reckoned as nine
1912 # hours behind Greenwich Time and called Yukon Standard Time.
1913 #
1914 # (2) Notwithstanding subsection (1), the Commissioner may make regulations
1915 # varying the manner of reckoning standard time.
1916 #
1917 # * Yukon Territory Commissioner's Order 1966-20 Interpretation Ordinance
1918 # http://? - no online source found
1919 #
1920 # * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC,
1921 # Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS)
1922 # http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon
1923 # Territory Commissioner's Order 1967-59 Interpretation Ordinance ...
1924 #
1925 # 1. Commissioner's Order 1966-20 dated at Whitehorse in the Yukon
1926 # Territory on 27th January, 1966, is hereby revoked.
1927 #
1928 # 2. Yukon (East) Standard Time as defined by section 36 of the
1929 # Interpretation Ordinance from and after mid-night on the 28th day of May,
1930 # 1967 shall be reckoned in the same manner as Pacific Standard Time, that
1931 # is to say, eight hours behind Greenwich Time in the area of the Yukon
1932 # Territory lying east of the 138th degree longitude west.
1933 #
1934 # 3. In the remainder of the Territory, lying west of the 138th degree
1935 # longitude west, Yukon (West) Standard Time shall be reckoned as nine
1936 # hours behind Greenwich Time.
1937 #
1938 # * Yukon Standard Time defined as Pacific Standard Time, YCO 1973/214
1939 # http://www.canlii.org/en/yk/laws/regu/yco-1973-214/latest/yco-1973-214.html
1940 # C.O. 1973/214 INTERPRETATION ACT ...
1941 #
1942 # 1. Effective October 28, 1973 Commissioner's Order 1967/59 is hereby
1943 # revoked.
1944 #
1945 # 2. Yukon Standard Time as defined by section 36 of the Interpretation
1946 # Act from and after midnight on the twenty-eighth day of October, 1973
1947 # shall be reckoned in the same manner as Pacific Standard Time, that is
1948 # to say eight hours behind Greenwich Time.
1949 #
1950 # * O.I.C. 1980/02 INTERPRETATION ACT
1951 # http://? - no online source found
1952 #
1953 # * Yukon Daylight Saving Time, YOIC 1987/56
1954 # http://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html
1955 # O.I.C. 1987/056 INTERPRETATION ACT ...
1956 #
1957 # In every year between
1958 # (a) two o'clock in the morning in the first Sunday in April, and
1959 # (b) two o'clock in the morning in the last Sunday in October,
1960 # Standard Time shall be reckoned as seven hours behind Greenwich Time and
1961 # called Yukon Daylight Saving Time.
1962 # ...
1963 # Dated ... 9th day of March, A.D., 1987.
1964 #
1965 # * Yukon Daylight Saving Time 2006, YOIC 2006/127
1966 # http://www.canlii.org/en/yk/laws/regu/yoic-2006-127/latest/yoic-2006-127.html
1967 # O.I.C. 2006/127 INTERPRETATION ACT ...
1968 #
1969 # 1. In Yukon each year the time for general purposes shall be 7 hours
1970 # behind Greenwich mean time during the period commencing at two o'clock
1971 # in the forenoon on the second Sunday of March and ending at two o'clock
1972 # in the forenoon on the first Sunday of November and shall be called
1973 # Yukon Daylight Saving Time.
1974 #
1975 # 2. Order-in-Council 1987/56 is revoked.
1976 #
1977 # 3. This order comes into force January 1, 2007.
1978 #
1979 # * Interpretation Act, RSY 2002, c 125
1980 # http://www.canlii.org/en/yk/laws/stat/rsy-2002-c-125/latest/rsy-2002-c-125.html
1981
1982 # From Rives McDow (1999-09-04):
1983 # Nunavut ... moved ... to incorporate the whole territory into one time zone.
1984 # Nunavut moves to single time zone Oct. 31
1985 # http://www.nunatsiaq.com/nunavut/nvt90903_13.html
1986 #
1987 # From Antoine Leca (1999-09-06):
1988 # We then need to create a new timezone for the Kitikmeot region of Nunavut
1989 # to differentiate it from the Yellowknife region.
1990
1991 # From Paul Eggert (1999-09-20):
1992 # Basic Facts: The New Territory
1993 # http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html
1994 # (1999) reports that Pangnirtung operates on eastern time,
1995 # and that Coral Harbour does not observe DST. We don't know when
1996 # Pangnirtung switched to eastern time; we'll guess 1995.
1997
1998 # From Rives McDow (1999-11-08):
1999 # On October 31, when the rest of Nunavut went to Central time,
2000 # Pangnirtung wobbled. Here is the result of their wobble:
2001 #
2002 # The following businesses and organizations in Pangnirtung use Central Time:
2003 #
2004 # First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
2005 # Eastern Arctic National Parks, A & D Specialist
2006 #
2007 # The following businesses and organizations in Pangnirtung use Eastern Time:
2008 #
2009 # Hamlet office, All other businesses, Both schools, Airport operator
2010 #
2011 # This has made for an interesting situation there, which warranted the news.
2012 # No one there that I spoke with seems concerned, or has plans to
2013 # change the local methods of keeping time, as it evidently does not
2014 # really interfere with any activities or make things difficult locally.
2015 # They plan to celebrate New Year's turn-over twice, one hour apart,
2016 # so it appears that the situation will last at least that long.
2017 # The Nunavut Intergovernmental Affairs hopes that they will "come to
2018 # their senses", but the locals evidently don't see any problem with
2019 # the current state of affairs.
2020
2021 # From Michaela Rodrigue, writing in the
2022 # Nunatsiaq News (1999-11-19):
2023 # http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html
2024 # Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
2025 # central - or Nunavut time - for government offices, and eastern time
2026 # for municipal offices and schools.... Igloolik [was similar but then]
2027 # made the switch to central time on Saturday, Nov. 6.
2028
2029 # From Paul Eggert (2000-10-02):
2030 # Matthews and Vincent (1998) say the following, but we lack histories
2031 # for these potential new Zones.
2032 #
2033 # The Canadian Forces station at Alert uses Eastern Time while the
2034 # handful of residents at the Eureka weather station [in the Central
2035 # zone] skip daylight savings. Baffin Island, which is crossed by the
2036 # Central, Eastern and Atlantic Time zones only uses Eastern Time.
2037 # Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
2038 # Central Time and Southampton Island [in the Central zone] is not
2039 # required to use daylight savings.
2040
2041 # From <http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html>
2042 # Nunavut now has two time zones (2000-11-10):
2043 # The Nunavut government would allow its employees in Kugluktuk and
2044 # Cambridge Bay to operate on central time year-round, putting them
2045 # one hour behind the rest of Nunavut for six months during the winter.
2046 # At the end of October the two communities had rebelled against
2047 # Nunavut's unified time zone, refusing to shift to eastern time with
2048 # the rest of the territory for the winter. Cambridge Bay remained on
2049 # central time, while Kugluktuk, even farther west, reverted to
2050 # mountain time, which they had used before the advent of Nunavut's
2051 # unified time zone in 1999.
2052 #
2053 # From Rives McDow (2001-01-20), quoting the Nunavut government:
2054 # The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
2055
2056 # From Paul Eggert (2000-12-04):
2057 # Let's just keep track of the official times for now.
2058
2059 # From Rives McDow (2001-03-07):
2060 # The premier of Nunavut has issued a ministerial statement advising
2061 # that effective 2001-04-01, the territory of Nunavut will revert
2062 # back to three time zones (mountain, central, and eastern). Of the
2063 # cities in Nunavut, Coral Harbor is the only one that I know of that
2064 # has said it will not observe dst, staying on EST year round. I'm
2065 # checking for more info, and will get back to you if I come up with
2066 # more.
2067 # [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
2068
2069 # From Gwillim Law (2005-05-21):
2070 # According to ...
2071 # http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp
2072 # (from a 1998 Canadian Geographic article), the de facto and de jure time
2073 # for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year
2074 # round. Using Google, it's easy to find other websites that confirm this.
2075 # I wasn't able to find how far back this time regimen goes, but since it
2076 # predates the creation of Nunavut, it probably goes back many years....
2077 # The Inuktitut name of Coral Harbour is Sallit, but it's rarely used.
2078 #
2079 # From Paul Eggert (2014-10-17):
2080 # For lack of better information, assume that Southampton Island observed
2081 # daylight saving only during wartime. Gwillim Law's email also
2082 # mentioned maps now maintained by National Research Council Canada;
2083 # see above for an up-to-date link.
2084
2085 # From Chris Walton (2007-03-01):
2086 # ... the community of Resolute (located on Cornwallis Island in
2087 # Nunavut) moved from Central Time to Eastern Time last November.
2088 # Basically the community did not change its clocks at the end of
2089 # daylight saving....
2090 # http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html
2091
2092 # From Chris Walton (2011-03-21):
2093 # Back in 2007 I initiated the creation of a new "zone file" for Resolute
2094 # Bay. Resolute Bay is a small community located about 900km north of
2095 # the Arctic Circle. The zone file was required because Resolute Bay had
2096 # decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007.
2097 #
2098 # According to new information which I received last week, Resolute Bay
2099 # went back to using UTC-6 in the winter of 2007-2008...
2100 #
2101 # On March 11/2007 most of Canada went onto daylight saving. On March
2102 # 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I
2103 # talked to somebody that was both knowledgeable and helpful. I was able
2104 # to confirm that Resolute Bay was still operating on UTC-5. It was
2105 # explained to me that Resolute Bay had been on the Eastern Time zone
2106 # (EST) in the winter, and was now back on the Central Time zone (CDT).
2107 # i.e. the time zone had changed twice in the last year but the clocks
2108 # had not moved. The residents had to know which time zone they were in
2109 # so they could follow the correct TV schedule...
2110 #
2111 # On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I
2112 # phoned the Resolute Bay hamlet office...[D]ue to the challenging nature
2113 # of the phone call, I decided to seek out an alternate source of
2114 # information. I found an e-mail address for somebody by the name of
2115 # Stephanie Adams whose job was listed as "Inns North Support Officer for
2116 # Arctic Co-operatives." I was under the impression that Stephanie lived
2117 # and worked in Resolute Bay...
2118 #
2119 # On March 14/2011 I phoned the hamlet office again. I was told that
2120 # Resolute Bay had been using Central Standard Time over the winter of
2121 # 2010-2011 and that the clocks had therefore been moved one hour ahead
2122 # on March 13/2011. The person I talked to was aware that Resolute Bay
2123 # had previously experimented with Eastern Standard Time but he could not
2124 # tell me when the practice had stopped.
2125 #
2126 # On March 17/2011 I searched the Web to find an e-mail address of
2127 # somebody that might be able to tell me exactly when Resolute Bay went
2128 # off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz
2129 # used to be the mayor of Resolute Bay and he apparently owns half the
2130 # businesses including "South Camp Inn." This website has some info on
2131 # Aziz:
2132 # http://www.uphere.ca/node/493
2133 #
2134 # I sent Aziz an e-mail asking when Resolute Bay had stopped using
2135 # Eastern Standard Time.
2136 #
2137 # Aziz responded quickly with this: "hi, The time was not changed for the
2138 # 1 year only, the following year, the community went back to the old way
2139 # of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in
2140 # the winter Zulu plus 6 hrs"
2141 #
2142 # This of course conflicted with everything I had ascertained in November 2008.
2143 #
2144 # I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz
2145 # responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You
2146 # may want to check with the weather office in Resolute Bay or do a
2147 # search on the weather through Env. Canada. web site"
2148 #
2149 # If I had realized the Stephanie did not live in Resolute Bay I would
2150 # never have contacted her. I now believe that all the information I
2151 # obtained in November 2008 should be ignored...
2152 # I apologize for reporting incorrect information in 2008.
2153
2154 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2155 Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
2156 Rule NT_YK 1918 only - Oct 27 2:00 0 S
2157 Rule NT_YK 1919 only - May 25 2:00 1:00 D
2158 Rule NT_YK 1919 only - Nov 1 0:00 0 S
2159 Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War
2160 Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace
2161 Rule NT_YK 1945 only - Sep 30 2:00 0 S
2162 Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
2163 Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
2164 Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
2165 Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S
2166 Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D
2167 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2168 # aka Panniqtuuq
2169 Zone America/Pangnirtung 0 - zzz 1921 # trading post est.
2170 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
2171 -5:00 Canada E%sT 1999 Oct 31 2:00
2172 -6:00 Canada C%sT 2000 Oct 29 2:00
2173 -5:00 Canada E%sT
2174 # formerly Frobisher Bay
2175 Zone America/Iqaluit 0 - zzz 1942 Aug # Frobisher Bay est.
2176 -5:00 NT_YK E%sT 1999 Oct 31 2:00
2177 -6:00 Canada C%sT 2000 Oct 29 2:00
2178 -5:00 Canada E%sT
2179 # aka Qausuittuq
2180 Zone America/Resolute 0 - zzz 1947 Aug 31 # Resolute founded
2181 -6:00 NT_YK C%sT 2000 Oct 29 2:00
2182 -5:00 - EST 2001 Apr 1 3:00
2183 -6:00 Canada C%sT 2006 Oct 29 2:00
2184 -5:00 - EST 2007 Mar 11 3:00
2185 -6:00 Canada C%sT
2186 # aka Kangiqiniq
2187 Zone America/Rankin_Inlet 0 - zzz 1957 # Rankin Inlet founded
2188 -6:00 NT_YK C%sT 2000 Oct 29 2:00
2189 -5:00 - EST 2001 Apr 1 3:00
2190 -6:00 Canada C%sT
2191 # aka Iqaluktuuttiaq
2192 Zone America/Cambridge_Bay 0 - zzz 1920 # trading post est.?
2193 -7:00 NT_YK M%sT 1999 Oct 31 2:00
2194 -6:00 Canada C%sT 2000 Oct 29 2:00
2195 -5:00 - EST 2000 Nov 5 0:00
2196 -6:00 - CST 2001 Apr 1 3:00
2197 -7:00 Canada M%sT
2198 Zone America/Yellowknife 0 - zzz 1935 # Yellowknife founded?
2199 -7:00 NT_YK M%sT 1980
2200 -7:00 Canada M%sT
2201 Zone America/Inuvik 0 - zzz 1953 # Inuvik founded
2202 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
2203 -7:00 NT_YK M%sT 1980
2204 -7:00 Canada M%sT
2205 Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
2206 -9:00 NT_YK Y%sT 1967 May 28 0:00
2207 -8:00 NT_YK P%sT 1980
2208 -8:00 Canada P%sT
2209 Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
2210 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
2211 -8:00 NT_YK P%sT 1980
2212 -8:00 Canada P%sT
2213
2214
2215 ###############################################################################
2216
2217 # Mexico
2218
2219 # From Paul Eggert (2014-12-07):
2220 # The Investigation and Analysis Service of the
2221 # Mexican Library of Congress (MLoC) has published a
2222 # history of Mexican local time (in Spanish)
2223 # http://www.diputados.gob.mx/bibliot/publica/inveyana/polisoc/horver/index.htm
2224 #
2225 # Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
2226 # (In all cases we go with the MLoC.)
2227 # S&P report that Baja was at -8:00 in 1922/1923.
2228 # S&P say the 1930 transition in Baja was 1930-11-16.
2229 # S&P report no DST during summer 1931.
2230 # S&P report a transition at 1932-03-30 23:00, not 1932-04-01.
2231
2232 # From Gwillim Law (2001-02-20):
2233 # There are some other discrepancies between the Decrees page and the
2234 # tz database. I think they can best be explained by supposing that
2235 # the researchers who prepared the Decrees page failed to find some of
2236 # the relevant documents.
2237
2238 # From Alan Perry (1996-02-15):
2239 # A guy from our Mexico subsidiary finally found the Presidential Decree
2240 # outlining the timezone changes in Mexico.
2241 #
2242 # ------------- Begin Forwarded Message -------------
2243 #
2244 # I finally got my hands on the Official Presidential Decree that sets up the
2245 # rules for the DST changes. The rules are:
2246 #
2247 # 1. The country is divided in 3 timezones:
2248 # - Baja California Norte (the Mexico/BajaNorte TZ)
2249 # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
2250 # - The rest of the country (the Mexico/General TZ)
2251 #
2252 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
2253 # at 2:00 AM, the times in each zone are as follows:
2254 # BajaNorte: GMT+7
2255 # BajaSur: GMT+6
2256 # General: GMT+5
2257 #
2258 # 3. The rest of the year, the times are as follows:
2259 # BajaNorte: GMT+8
2260 # BajaSur: GMT+7
2261 # General: GMT+6
2262 #
2263 # The Decree was published in Mexico's Official Newspaper on January 4th.
2264 #
2265 # -------------- End Forwarded Message --------------
2266 # From Paul Eggert (1996-06-12):
2267 # For an English translation of the decree, see
2268 # "Diario Oficial: Time Zone Changeover" (1996-01-04).
2269 # http://mexico-travel.com/extra/timezone_eng.html
2270
2271 # From Rives McDow (1998-10-08):
2272 # The State of Quintana Roo has reverted back to central STD and DST times
2273 # (i.e. UTC -0600 and -0500 as of 1998-08-02).
2274
2275 # From Rives McDow (2000-01-10):
2276 # Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
2277 # zone 5 hours from the International Date Line, and will not observe daylight
2278 # savings time so as to stay on the same time zone as the southern part of
2279 # Arizona year round.
2280
2281 # From Jesper Nørgaard, translating
2282 # <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
2283 # In Oaxaca, the 55.000 teachers from the Section 22 of the National
2284 # Syndicate of Education Workers, refuse to apply daylight saving each
2285 # year, so that the more than 10,000 schools work at normal hour the
2286 # whole year.
2287
2288 # From Gwillim Law (2001-01-19):
2289 # <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
2290 # (translated):...
2291 # January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
2292 # that Summer Time will be reduced from seven to five months, starting
2293 # this year....
2294 # http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001
2295 # [translated], says "summer time will ... take effect on the first Sunday
2296 # in May, and end on the last Sunday of September.
2297
2298 # From Arthur David Olson (2001-01-25):
2299 # The 2001-01-24 traditional Washington Post contained the page one
2300 # story "Timely Issue Divides Mexicans."...
2301 # http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
2302 # ... Mexico City Mayor López Obrador "...is threatening to keep
2303 # Mexico City and its 20 million residents on a different time than
2304 # the rest of the country..." In particular, López Obrador would abolish
2305 # observation of Daylight Saving Time.
2306
2307 # Official statute published by the Energy Department
2308 # http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre
2309 # (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
2310 # and Sonora with no DST. This was reported by Jesper Nørgaard (2001-02-03).
2311
2312 # From Paul Eggert (2001-03-03):
2313 #
2314 # http://www.latimes.com/news/nation/20010303/t000018766.html
2315 # James F. Smith writes in today's LA Times
2316 # * Sonora will continue to observe standard time.
2317 # * Last week Mexico City's mayor Andrés Manuel López Obrador decreed that
2318 # the Federal District will not adopt DST.
2319 # * 4 of 16 district leaders announced they'll ignore the decree.
2320 # * The decree does not affect federal-controlled facilities including
2321 # the airport, banks, hospitals, and schools.
2322 #
2323 # For now we'll assume that the Federal District will bow to federal rules.
2324
2325 # From Jesper Nørgaard (2001-04-01):
2326 # I found some references to the Mexican application of daylight
2327 # saving, which modifies what I had already sent you, stating earlier
2328 # that a number of northern Mexican states would go on daylight
2329 # saving. The modification reverts this to only cover Baja California
2330 # (Norte), while all other states (except Sonora, who has no daylight
2331 # saving all year) will follow the original decree of president
2332 # Vicente Fox, starting daylight saving May 6, 2001 and ending
2333 # September 30, 2001.
2334 # References: "Diario de Monterrey" <http://www.diariodemonterrey.com/index.asp>
2335 # Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
2336
2337 # From Reuters (2001-09-04):
2338 # Mexico's Supreme Court on Tuesday declared that daylight savings was
2339 # unconstitutional in Mexico City, creating the possibility the
2340 # capital will be in a different time zone from the rest of the nation
2341 # next year.... The Supreme Court's ruling takes effect at 2:00
2342 # a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
2343 # standard time. "This is so residents of the Federal District are not
2344 # subject to unexpected time changes," a statement from the court said.
2345
2346 # From Jesper Nørgaard Welen (2002-03-12):
2347 # ... consulting my local grocery store(!) and my coworkers, they all insisted
2348 # that a new decision had been made to reinstate US style DST in Mexico....
2349 # http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
2350 # confirms this. Sonora as usual is the only state where DST is not applied.
2351
2352 # From Steffen Thorsen (2009-12-28):
2353 #
2354 # Steffen Thorsen wrote:
2355 # > Mexico's House of Representatives has approved a proposal for northern
2356 # > Mexico's border cities to share the same daylight saving schedule as
2357 # > the United States.
2358 # Now this has passed both the Congress and the Senate, so starting from
2359 # 2010, some border regions will be the same:
2360 # http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/
2361 # http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939
2362 # (Spanish)
2363 #
2364 # Could not find the new law text, but the proposed law text changes are here:
2365 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf
2366 # (Gaceta Parlamentaria)
2367 #
2368 # There is also a list of the votes here:
2369 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html
2370 #
2371 # Our page:
2372 # http://www.timeanddate.com/news/time/north-mexico-dst-change.html
2373
2374 # From Arthur David Olson (2010-01-20):
2375 # The page
2376 # http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
2377 # includes this text:
2378 # En los municipios fronterizos de Tijuana y Mexicali en Baja California;
2379 # Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila;
2380 # Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en
2381 # Tamaulipas, la aplicación de este horario estacional surtirá efecto
2382 # desde las dos horas del segundo domingo de marzo y concluirá a las dos
2383 # horas del primer domingo de noviembre.
2384 # En los municipios fronterizos que se encuentren ubicados en la franja
2385 # fronteriza norte en el territorio comprendido entre la línea
2386 # internacional y la línea paralela ubicada a una distancia de veinte
2387 # kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el
2388 # interior del país, la aplicación de este horario estacional surtirá
2389 # efecto desde las dos horas del segundo domingo de marzo y concluirá a
2390 # las dos horas del primer domingo de noviembre.
2391
2392 # From Steffen Thorsen (2014-12-08), translated by Gwillim Law:
2393 # The Mexican state of Quintana Roo will likely change to EST in 2015.
2394 #
2395 # http://www.unioncancun.mx/articulo/2014/12/04/medio-ambiente/congreso-aprueba-una-hora-mas-de-sol-en-qroo
2396 # "With this change, the time conflict that has existed between the municipios
2397 # of Quintana Roo and the municipio of Felipe Carrillo Puerto may come to an
2398 # end. The latter declared itself in rebellion 15 years ago when a time change
2399 # was initiated in Mexico, and since then it has refused to change its time
2400 # zone along with the rest of the country."
2401 #
2402 # From Steffen Thorsen (2015-01-14), translated by Gwillim Law:
2403 # http://sipse.com/novedades/confirman-aplicacion-de-nueva-zona-horaria-para-quintana-roo-132331.html
2404 # "...the new time zone will come into effect at two o'clock on the first Sunday
2405 # of February, when we will have to advance the clock one hour from its current
2406 # time..."
2407 # Also, the new zone will not use DST.
2408 #
2409 # From Carlos Raúl Perasso (2015-02-02):
2410 # The decree that modifies the Mexican Hour System Law has finally
2411 # been published at the Diario Oficial de la Federación
2412 # http://www.dof.gob.mx/nota_detalle.php?codigo=5380123&fecha=31/01/2015
2413 # It establishes 5 zones for Mexico:
2414 # 1- Zona Centro (Central Zone): Corresponds to longitude 90 W,
2415 # includes most of Mexico, excluding what's mentioned below.
2416 # 2- Zona Pacífico (Pacific Zone): Longitude 105 W, includes the
2417 # states of Baja California Sur; Chihuahua; Nayarit (excluding Bahía
2418 # de Banderas which lies in Central Zone); Sinaloa and Sonora.
2419 # 3- Zona Noroeste (Northwest Zone): Longitude 120 W, includes the
2420 # state of Baja California.
2421 # 4- Zona Sureste (Southeast Zone): Longitude 75 W, includes the state
2422 # of Quintana Roo.
2423 # 5- The islands, reefs and keys shall take their timezone from the
2424 # longitude they are located at.
2425
2426 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2427 Rule Mexico 1939 only - Feb 5 0:00 1:00 D
2428 Rule Mexico 1939 only - Jun 25 0:00 0 S
2429 Rule Mexico 1940 only - Dec 9 0:00 1:00 D
2430 Rule Mexico 1941 only - Apr 1 0:00 0 S
2431 Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
2432 Rule Mexico 1944 only - May 1 0:00 0 S
2433 Rule Mexico 1950 only - Feb 12 0:00 1:00 D
2434 Rule Mexico 1950 only - Jul 30 0:00 0 S
2435 Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
2436 Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
2437 Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
2438 Rule Mexico 2001 only - Sep lastSun 2:00 0 S
2439 Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
2440 Rule Mexico 2002 max - Oct lastSun 2:00 0 S
2441 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2442 # Quintana Roo; represented by Cancún
2443 Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
2444 -6:00 - CST 1981 Dec 23
2445 -5:00 Mexico E%sT 1998 Aug 2 2:00
2446 -6:00 Mexico C%sT 2015 Feb 1 2:00
2447 -5:00 - EST
2448 # Campeche, Yucatán; represented by Mérida
2449 Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
2450 -6:00 - CST 1981 Dec 23
2451 -5:00 - EST 1982 Dec 2
2452 -6:00 Mexico C%sT
2453 # Coahuila, Durango, Nuevo León, Tamaulipas (near US border)
2454 Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00
2455 -6:00 - CST 1988
2456 -6:00 US C%sT 1989
2457 -6:00 Mexico C%sT 2010
2458 -6:00 US C%sT
2459 # Coahuila, Durango, Nuevo León, Tamaulipas (away from US border)
2460 Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
2461 -6:00 - CST 1988
2462 -6:00 US C%sT 1989
2463 -6:00 Mexico C%sT
2464 # Central Mexico
2465 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
2466 -7:00 - MST 1927 Jun 10 23:00
2467 -6:00 - CST 1930 Nov 15
2468 -7:00 - MST 1931 May 1 23:00
2469 -6:00 - CST 1931 Oct
2470 -7:00 - MST 1932 Apr 1
2471 -6:00 Mexico C%sT 2001 Sep 30 2:00
2472 -6:00 - CST 2002 Feb 20
2473 -6:00 Mexico C%sT
2474 # Chihuahua (near US border)
2475 Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20
2476 -7:00 - MST 1927 Jun 10 23:00
2477 -6:00 - CST 1930 Nov 15
2478 -7:00 - MST 1931 May 1 23:00
2479 -6:00 - CST 1931 Oct
2480 -7:00 - MST 1932 Apr 1
2481 -6:00 - CST 1996
2482 -6:00 Mexico C%sT 1998
2483 -6:00 - CST 1998 Apr Sun>=1 3:00
2484 -7:00 Mexico M%sT 2010
2485 -7:00 US M%sT
2486 # Chihuahua (away from US border)
2487 Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
2488 -7:00 - MST 1927 Jun 10 23:00
2489 -6:00 - CST 1930 Nov 15
2490 -7:00 - MST 1931 May 1 23:00
2491 -6:00 - CST 1931 Oct
2492 -7:00 - MST 1932 Apr 1
2493 -6:00 - CST 1996
2494 -6:00 Mexico C%sT 1998
2495 -6:00 - CST 1998 Apr Sun>=1 3:00
2496 -7:00 Mexico M%sT
2497 # Sonora
2498 Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
2499 -7:00 - MST 1927 Jun 10 23:00
2500 -6:00 - CST 1930 Nov 15
2501 -7:00 - MST 1931 May 1 23:00
2502 -6:00 - CST 1931 Oct
2503 -7:00 - MST 1932 Apr 1
2504 -6:00 - CST 1942 Apr 24
2505 -7:00 - MST 1949 Jan 14
2506 -8:00 - PST 1970
2507 -7:00 Mexico M%sT 1999
2508 -7:00 - MST
2509
2510 # From Alexander Krivenyshev (2010-04-21):
2511 # According to news, Bahía de Banderas (Mexican state of Nayarit)
2512 # changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to
2513 # share the same time zone as nearby city Puerto Vallarta, Jalisco).
2514 #
2515 # (Spanish)
2516 # Bahía de Banderas homologa su horario al del centro del
2517 # país, a partir de este domingo
2518 # http://www.nayarit.gob.mx/notes.asp?id=20748
2519 #
2520 # Bahía de Banderas homologa su horario con el del Centro del
2521 # País
2522 # 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
2523 #
2524 # (English)
2525 # Puerto Vallarta and Bahía de Banderas: One Time Zone
2526 # http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml
2527 # http://www.worldtimezone.com/dst_news/dst_news_mexico08.html
2528 #
2529 # "Mexico's Senate approved the amendments to the Mexican Schedule System that
2530 # will allow Bahía de Banderas and Puerto Vallarta to share the same time
2531 # zone ..."
2532 # Baja California Sur, Nayarit, Sinaloa
2533
2534 # From Arthur David Olson (2010-05-01):
2535 # Use "Bahia_Banderas" to keep the name to fourteen characters.
2536
2537 # Mazatlán
2538 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
2539 -7:00 - MST 1927 Jun 10 23:00
2540 -6:00 - CST 1930 Nov 15
2541 -7:00 - MST 1931 May 1 23:00
2542 -6:00 - CST 1931 Oct
2543 -7:00 - MST 1932 Apr 1
2544 -6:00 - CST 1942 Apr 24
2545 -7:00 - MST 1949 Jan 14
2546 -8:00 - PST 1970
2547 -7:00 Mexico M%sT
2548
2549 # Bahía de Banderas
2550 Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00
2551 -7:00 - MST 1927 Jun 10 23:00
2552 -6:00 - CST 1930 Nov 15
2553 -7:00 - MST 1931 May 1 23:00
2554 -6:00 - CST 1931 Oct
2555 -7:00 - MST 1932 Apr 1
2556 -6:00 - CST 1942 Apr 24
2557 -7:00 - MST 1949 Jan 14
2558 -8:00 - PST 1970
2559 -7:00 Mexico M%sT 2010 Apr 4 2:00
2560 -6:00 Mexico C%sT
2561
2562 # Baja California (near US border)
2563 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
2564 -7:00 - MST 1924
2565 -8:00 - PST 1927 Jun 10 23:00
2566 -7:00 - MST 1930 Nov 15
2567 -8:00 - PST 1931 Apr 1
2568 -8:00 1:00 PDT 1931 Sep 30
2569 -8:00 - PST 1942 Apr 24
2570 -8:00 1:00 PWT 1945 Aug 14 23:00u
2571 -8:00 1:00 PPT 1945 Nov 12 # Peace
2572 -8:00 - PST 1948 Apr 5
2573 -8:00 1:00 PDT 1949 Jan 14
2574 -8:00 - PST 1954
2575 -8:00 CA P%sT 1961
2576 -8:00 - PST 1976
2577 -8:00 US P%sT 1996
2578 -8:00 Mexico P%sT 2001
2579 -8:00 US P%sT 2002 Feb 20
2580 -8:00 Mexico P%sT 2010
2581 -8:00 US P%sT
2582 # Baja California (away from US border)
2583 Zone America/Santa_Isabel -7:39:28 - LMT 1922 Jan 1 0:20:32
2584 -7:00 - MST 1924
2585 -8:00 - PST 1927 Jun 10 23:00
2586 -7:00 - MST 1930 Nov 15
2587 -8:00 - PST 1931 Apr 1
2588 -8:00 1:00 PDT 1931 Sep 30
2589 -8:00 - PST 1942 Apr 24
2590 -8:00 1:00 PWT 1945 Aug 14 23:00u
2591 -8:00 1:00 PPT 1945 Nov 12 # Peace
2592 -8:00 - PST 1948 Apr 5
2593 -8:00 1:00 PDT 1949 Jan 14
2594 -8:00 - PST 1954
2595 -8:00 CA P%sT 1961
2596 -8:00 - PST 1976
2597 -8:00 US P%sT 1996
2598 -8:00 Mexico P%sT 2001
2599 -8:00 US P%sT 2002 Feb 20
2600 -8:00 Mexico P%sT
2601 # From Paul Eggert (2006-03-22):
2602 # Formerly there was an America/Ensenada zone, which differed from
2603 # America/Tijuana only in that it did not observe DST from 1976
2604 # through 1995. This was as per Shanks (1999). But Shanks & Pottenger say
2605 # Ensenada did not observe DST from 1948 through 1975. Guy Harris reports
2606 # that the 1987 OAG says "Only Ensenada, Mexicali, San Felipe and
2607 # Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
2608 # DST-observance was a town-by-town matter back then. This concerns
2609 # data after 1970 so most likely there should be at least one Zone
2610 # other than America/Tijuana for Baja, but it's not clear yet what its
2611 # name or contents should be.
2612 #
2613 # Revillagigedo Is
2614 # no information
2615
2616 ###############################################################################
2617
2618 # Anguilla
2619 # Antigua and Barbuda
2620 # See America/Port_of_Spain.
2621
2622 # Bahamas
2623 #
2624 # For 1899 Milne gives -5:09:29.5; round that.
2625 #
2626 # From Sue Williams (2006-12-07):
2627 # The Bahamas announced about a month ago that they plan to change their DST
2628 # rules to sync with the U.S. starting in 2007....
2629 # http://www.jonesbahamas.com/?c=45&a=10412
2630
2631 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2632 Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S
2633 Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D
2634 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2635 Zone America/Nassau -5:09:30 - LMT 1912 Mar 2
2636 -5:00 Bahamas E%sT 1976
2637 -5:00 US E%sT
2638
2639 # Barbados
2640
2641 # For 1899 Milne gives -3:58:29.2; round that.
2642
2643 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2644 Rule Barb 1977 only - Jun 12 2:00 1:00 D
2645 Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
2646 Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
2647 Rule Barb 1979 only - Sep 30 2:00 0 S
2648 Rule Barb 1980 only - Sep 25 2:00 0 S
2649 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2650 Zone America/Barbados -3:58:29 - LMT 1924 # Bridgetown
2651 -3:58:29 - BMT 1932 # Bridgetown Mean Time
2652 -4:00 Barb A%sT
2653
2654 # Belize
2655 # Whitman entirely disagrees with Shanks; go with Shanks & Pottenger.
2656 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2657 Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
2658 Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
2659 Rule Belize 1973 only - Dec 5 0:00 1:00 D
2660 Rule Belize 1974 only - Feb 9 0:00 0 S
2661 Rule Belize 1982 only - Dec 18 0:00 1:00 D
2662 Rule Belize 1983 only - Feb 12 0:00 0 S
2663 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2664 Zone America/Belize -5:52:48 - LMT 1912 Apr
2665 -6:00 Belize C%sT
2666
2667 # Bermuda
2668
2669 # For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower,
2670 # Bermuda dockyard, Ireland I; round that.
2671
2672 # From Dan Jones, reporting in The Royal Gazette (2006-06-26):
2673
2674 # Next year, however, clocks in the US will go forward on the second Sunday
2675 # in March, until the first Sunday in November. And, after the Time Zone
2676 # (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2677 # Friday, the same thing will happen in Bermuda.
2678 # http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2679
2680 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2681 Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton
2682 -4:00 - AST 1974 Apr 28 2:00
2683 -4:00 Canada A%sT 1976
2684 -4:00 US A%sT
2685
2686 # Cayman Is
2687 # See America/Panama.
2688
2689 # Costa Rica
2690
2691 # Milne gives -5:36:13.3 as San José mean time; round to nearest.
2692
2693 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2694 Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
2695 Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
2696 Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
2697 # IATA SSIM (1991-09) says the following was at 1:00;
2698 # go with Shanks & Pottenger.
2699 Rule CR 1991 only - Jul 1 0:00 0 S
2700 Rule CR 1992 only - Mar 15 0:00 0 S
2701 # There are too many San Josés elsewhere, so we'll use 'Costa Rica'.
2702 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2703 Zone America/Costa_Rica -5:36:13 - LMT 1890 # San José
2704 -5:36:13 - SJMT 1921 Jan 15 # San José Mean Time
2705 -6:00 CR C%sT
2706 # Coco
2707 # no information; probably like America/Costa_Rica
2708
2709 # Cuba
2710
2711 # From Paul Eggert (2013-02-21):
2712 # Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57
2713 # for the port, and -5:30 for meteorological observations.
2714 # For now, stick with Shanks & Pottenger.
2715
2716 # From Arthur David Olson (1999-03-29):
2717 # The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
2718 # the Cuban National Team and the Baltimore Orioles was carried live on
2719 # the Orioles Radio Network, including affiliate WTOP in Washington, DC.
2720 # During the game, play-by-play announcer Jim Hunter noted that
2721 # "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
2722 # Time today." (The "two hour" remark referred to losing one hour of
2723 # sleep on 1999-03-28 - when the announcers were in Cuba as it switched
2724 # to DST - and one more hour on 1999-04-04 - when the announcers will have
2725 # returned to Baltimore, which switches on that date.)
2726
2727 # From Steffen Thorsen (2013-11-11):
2728 # DST start in Cuba in 2004 ... does not follow the same rules as the
2729 # years before. The correct date should be Sunday 2004-03-28 00:00 ...
2730 # https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html
2731
2732 # From Evert van der Veer via Steffen Thorsen (2004-10-28):
2733 # Cuba is not going back to standard time this year.
2734 # From Paul Eggert (2006-03-22):
2735 # http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html
2736 # says that it's due to a problem at the Antonio Guiteras
2737 # thermoelectric plant, and says "This October there will be no return
2738 # to normal hours (after daylight saving time)".
2739 # For now, let's assume that it's a temporary measure.
2740
2741 # From Carlos A. Carnero Delgado (2005-11-12):
2742 # This year (just like in 2004-2005) there's no change in time zone
2743 # adjustment in Cuba. We will stay in daylight saving time:
2744 # http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html
2745
2746 # From Jesper Nørgaard Welen (2006-10-21):
2747 # An article in GRANMA INTERNACIONAL claims that Cuba will end
2748 # the 3 years of permanent DST next weekend, see
2749 # http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html
2750 # "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
2751 # watches should be set back one hour - going back to 00:00 hours - returning
2752 # to the normal schedule....
2753
2754 # From Paul Eggert (2007-03-02):
2755 # <http://www.granma.cubaweb.cu/english/news/art89.html>, dated yesterday,
2756 # says Cuban clocks will advance at midnight on March 10.
2757 # For lack of better information, assume Cuba will use US rules,
2758 # except that it switches at midnight standard time as usual.
2759 #
2760 # From Steffen Thorsen (2007-10-25):
2761 # Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
2762 # earlier - on the last Sunday of October, just like in 2006.
2763 #
2764 # He supplied these references:
2765 #
2766 # http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES
2767 # http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm
2768 #
2769 # From Alex Krivenyshev (2007-10-25):
2770 # Here is also article from Granma (Cuba):
2771 #
2772 # Regirá el Horario Normal desde el próximo domingo 28 de octubre
2773 # http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
2774 #
2775 # http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
2776
2777 # From Arthur David Olson (2008-03-09):
2778 # I'm in Maryland which is now observing United States Eastern Daylight
2779 # Time. At 9:44 local time I used RealPlayer to listen to
2780 # http://media.enet.cu/radioreloj
2781 # a Cuban information station, and heard
2782 # the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
2783 # indicating that Cuba is still on standard time.
2784
2785 # From Steffen Thorsen (2008-03-12):
2786 # It seems that Cuba will start DST on Sunday, 2007-03-16...
2787 # It was announced yesterday, according to this source (in Spanish):
2788 # http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
2789 #
2790 # Some more background information is posted here:
2791 # http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
2792 #
2793 # The article also says that Cuba has been observing DST since 1963,
2794 # while Shanks (and tzdata) has 1965 as the first date (except in the
2795 # 1940's). Many other web pages in Cuba also claim that it has been
2796 # observed since 1963, but with the exception of 1970 - an exception
2797 # which is not present in tzdata/Shanks. So there is a chance we need to
2798 # change some historic records as well.
2799 #
2800 # One example:
2801 # http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
2802
2803 # From Jesper Nørgaard Welen (2008-03-13):
2804 # The Cuban time change has just been confirmed on the most authoritative
2805 # web site, the Granma. Please check out
2806 # http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
2807 #
2808 # Basically as expected after Steffen Thorsen's information, the change
2809 # will take place midnight between Saturday and Sunday.
2810
2811 # From Arthur David Olson (2008-03-12):
2812 # Assume Sun>=15 (third Sunday) going forward.
2813
2814 # From Alexander Krivenyshev (2009-03-04)
2815 # According to the Radio Reloj - Cuba will start Daylight Saving Time on
2816 # midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009-
2817 # not on midnight March 14 / March 15 as previously thought.
2818 #
2819 # http://www.worldtimezone.com/dst_news/dst_news_cuba05.html
2820 # (in Spanish)
2821
2822 # From Arthur David Olson (2009-03-09)
2823 # I listened over the Internet to
2824 # http://media.enet.cu/readioreloj
2825 # this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
2826 # the time was announced as "diez cinco" - the same time as here, indicating
2827 # that has indeed switched to DST. Assume second Sunday from 2009 forward.
2828
2829 # From Steffen Thorsen (2011-03-08):
2830 # Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00
2831 # this year. Nothing about the end date known so far (if that has
2832 # changed at all).
2833 #
2834 # Source:
2835 # http://granma.co.cu/2011/03/08/nacional/artic01.html
2836 #
2837 # Our info:
2838 # http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html
2839 #
2840 # From Steffen Thorsen (2011-10-30)
2841 # Cuba will end DST two weeks later this year. Instead of going back
2842 # tonight, it has been delayed to 2011-11-13 at 01:00.
2843 #
2844 # One source (Spanish)
2845 # http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html
2846 #
2847 # Our page:
2848 # http://www.timeanddate.com/news/time/cuba-time-changes-2011.html
2849 #
2850 # From Steffen Thorsen (2012-03-01)
2851 # According to Radio Reloj, Cuba will start DST on Midnight between March
2852 # 31 and April 1.
2853 #
2854 # Radio Reloj has the following info (Spanish):
2855 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril
2856 #
2857 # Our info on it:
2858 # http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html
2859
2860 # From Steffen Thorsen (2012-11-03):
2861 # Radio Reloj and many other sources report that Cuba is changing back
2862 # to standard time on 2012-11-04:
2863 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre
2864 # From Paul Eggert (2012-11-03):
2865 # For now, assume the future rule is first Sunday in November.
2866
2867 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2868 Rule Cuba 1928 only - Jun 10 0:00 1:00 D
2869 Rule Cuba 1928 only - Oct 10 0:00 0 S
2870 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
2871 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
2872 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
2873 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
2874 Rule Cuba 1965 only - Jun 1 0:00 1:00 D
2875 Rule Cuba 1965 only - Sep 30 0:00 0 S
2876 Rule Cuba 1966 only - May 29 0:00 1:00 D
2877 Rule Cuba 1966 only - Oct 2 0:00 0 S
2878 Rule Cuba 1967 only - Apr 8 0:00 1:00 D
2879 Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
2880 Rule Cuba 1968 only - Apr 14 0:00 1:00 D
2881 Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
2882 Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
2883 Rule Cuba 1972 1974 - Oct 8 0:00 0 S
2884 Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
2885 Rule Cuba 1978 only - May 7 0:00 1:00 D
2886 Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
2887 Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
2888 Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
2889 Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
2890 Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
2891 Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
2892 Rule Cuba 1996 only - Oct 6 0:00s 0 S
2893 Rule Cuba 1997 only - Oct 12 0:00s 0 S
2894 Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
2895 Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S
2896 Rule Cuba 2000 2003 - Apr Sun>=1 0:00s 1:00 D
2897 Rule Cuba 2004 only - Mar lastSun 0:00s 1:00 D
2898 Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S
2899 Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D
2900 Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D
2901 Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D
2902 Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D
2903 Rule Cuba 2011 only - Nov 13 0:00s 0 S
2904 Rule Cuba 2012 only - Apr 1 0:00s 1:00 D
2905 Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S
2906 Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D
2907
2908 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2909 Zone America/Havana -5:29:28 - LMT 1890
2910 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
2911 -5:00 Cuba C%sT
2912
2913 # Dominica
2914 # See America/Port_of_Spain.
2915
2916 # Dominican Republic
2917
2918 # From Steffen Thorsen (2000-10-30):
2919 # Enrique Morales reported to me that the Dominican Republic has changed the
2920 # time zone to Eastern Standard Time as of Sunday 29 at 2 am....
2921 # http://www.listin.com.do/antes/261000/republica/princi.html
2922
2923 # From Paul Eggert (2000-12-04):
2924 # That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
2925
2926 # From Rives McDow (2000-12-01):
2927 # Dominican Republic changed its mind and presidential decree on Tuesday,
2928 # November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
2929 # Dominican Republic will be reverting to 8 hours from the International Date
2930 # Line, and will not be using DST in the foreseeable future. The reason they
2931 # decided to use DST was to be in synch with Puerto Rico, who was also going
2932 # to implement DST. When Puerto Rico didn't implement DST, the president
2933 # decided to revert.
2934
2935
2936 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2937 Rule DR 1966 only - Oct 30 0:00 1:00 D
2938 Rule DR 1967 only - Feb 28 0:00 0 S
2939 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
2940 Rule DR 1970 only - Feb 21 0:00 0 S
2941 Rule DR 1971 only - Jan 20 0:00 0 S
2942 Rule DR 1972 1974 - Jan 21 0:00 0 S
2943 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2944 Zone America/Santo_Domingo -4:39:36 - LMT 1890
2945 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
2946 -5:00 DR E%sT 1974 Oct 27
2947 -4:00 - AST 2000 Oct 29 2:00
2948 -5:00 US E%sT 2000 Dec 3 1:00
2949 -4:00 - AST
2950
2951 # El Salvador
2952
2953 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2954 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
2955 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
2956 # There are too many San Salvadors elsewhere, so use America/El_Salvador
2957 # instead of America/San_Salvador.
2958 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2959 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
2960 -6:00 Salv C%sT
2961
2962 # Grenada
2963 # Guadeloupe
2964 # St Barthélemy
2965 # St Martin (French part)
2966 # See America/Port_of_Spain.
2967
2968 # Guatemala
2969 #
2970 # From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
2971 # Diario Co Latino, at
2972 # <http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079>,
2973 # says in an article dated 2006-04-19 that the Guatemalan government had
2974 # decided on that date to advance official time by 60 minutes, to lessen the
2975 # impact of the elevated cost of oil.... Daylight saving time will last from
2976 # 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
2977 # From Paul Eggert (2006-06-22):
2978 # The Ministry of Energy and Mines, press release CP-15/2006
2979 # (2006-04-19), says DST ends at 24:00. See
2980 # http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf
2981
2982 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2983 Rule Guat 1973 only - Nov 25 0:00 1:00 D
2984 Rule Guat 1974 only - Feb 24 0:00 0 S
2985 Rule Guat 1983 only - May 21 0:00 1:00 D
2986 Rule Guat 1983 only - Sep 22 0:00 0 S
2987 Rule Guat 1991 only - Mar 23 0:00 1:00 D
2988 Rule Guat 1991 only - Sep 7 0:00 0 S
2989 Rule Guat 2006 only - Apr 30 0:00 1:00 D
2990 Rule Guat 2006 only - Oct 1 0:00 0 S
2991 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
2992 Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
2993 -6:00 Guat C%sT
2994
2995 # Haiti
2996 # From Gwillim Law (2005-04-15):
2997 # Risto O. Nykänen wrote me that Haiti is now on DST.
2998 # I searched for confirmation, and I found a press release
2999 # on the Web page of the Haitian Consulate in Chicago (2005-03-31),
3000 # <http://www.haitianconsulate.org/time.doc>. Translated from French, it says:
3001 #
3002 # "The Prime Minister's Communication Office notifies the public in general
3003 # and the press in particular that, following a decision of the Interior
3004 # Ministry and the Territorial Collectivities [I suppose that means the
3005 # provinces], Haiti will move to Eastern Daylight Time in the night from next
3006 # Saturday the 2nd to Sunday the 3rd.
3007 #
3008 # "Consequently, the Prime Minister's Communication Office wishes to inform
3009 # the population that the country's clocks will be set forward one hour
3010 # starting at midnight. This provision will hold until the last Saturday in
3011 # October 2005.
3012 #
3013 # "Port-au-Prince, March 31, 2005"
3014 #
3015 # From Steffen Thorsen (2006-04-04):
3016 # I have been informed by users that Haiti observes DST this year like
3017 # last year, so the current "only" rule for 2005 might be changed to a
3018 # "max" rule or to last until 2006. (Who knows if they will observe DST
3019 # next year or if they will extend their DST like US/Canada next year).
3020 #
3021 # I have found this article about it (in French):
3022 # http://www.haitipressnetwork.com/news.cfm?articleID=7612
3023 #
3024 # The reason seems to be an energy crisis.
3025
3026 # From Stephen Colebourne (2007-02-22):
3027 # Some IATA info: Haiti won't be having DST in 2007.
3028
3029 # From Steffen Thorsen (2012-03-11):
3030 # According to several news sources, Haiti will observe DST this year,
3031 # apparently using the same start and end date as USA/Canada.
3032 # So this means they have already changed their time.
3033 #
3034 # http://www.alterpresse.org/spip.php?article12510
3035 # http://radiovision2000haiti.net/home/?p=13253
3036 #
3037 # From Arthur David Olson (2012-03-11):
3038 # The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to
3039 # 3:00 a.m. rather than the traditional Haitian jump at midnight.
3040 # Assume a US-style fall back as well.
3041
3042 # From Steffen Thorsen (2013-03-10):
3043 # It appears that Haiti is observing DST this year as well, same rules
3044 # as US/Canada. They did it last year as well, and it looks like they
3045 # are going to observe DST every year now...
3046 #
3047 # http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/
3048 # http://www.canalplushaiti.net/?p=6714
3049
3050 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3051 Rule Haiti 1983 only - May 8 0:00 1:00 D
3052 Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
3053 Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
3054 # Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
3055 # Go with IATA.
3056 Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
3057 Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
3058 Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
3059 Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S
3060 Rule Haiti 2012 max - Mar Sun>=8 2:00 1:00 D
3061 Rule Haiti 2012 max - Nov Sun>=1 2:00 0 S
3062 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3063 Zone America/Port-au-Prince -4:49:20 - LMT 1890
3064 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
3065 -5:00 Haiti E%sT
3066
3067 # Honduras
3068 # Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.
3069
3070 # From Paul Eggert (2006-05-05):
3071 # worldtimezone.com reports a 2006-05-02 Spanish-language AP article
3072 # saying Honduras will start using DST midnight Saturday, effective 4
3073 # months until September. La Tribuna reported today
3074 # <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president
3075 # of Honduras, refused to back down on this.
3076
3077 # From Jesper Nørgaard Welen (2006-08-08):
3078 # It seems that Honduras has returned from DST to standard time this Monday at
3079 # 00:00 hours (prolonging Sunday to 25 hours duration).
3080 # http://www.worldtimezone.com/dst_news/dst_news_honduras04.html
3081
3082 # From Paul Eggert (2006-08-08):
3083 # Also see Diario El Heraldo, The country returns to standard time (2006-08-08).
3084 # http://www.elheraldo.hn/nota.php?nid=54941&sec=12
3085 # It mentions executive decree 18-2006.
3086
3087 # From Steffen Thorsen (2006-08-17):
3088 # Honduras will observe DST from 2007 to 2009, exact dates are not
3089 # published, I have located this authoritative source:
3090 # http://www.presidencia.gob.hn/noticia.aspx?nId=47
3091
3092 # From Steffen Thorsen (2007-03-30):
3093 # http://www.laprensahn.com/pais_nota.php?id04962=7386
3094 # So it seems that Honduras will not enter DST this year....
3095
3096 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3097 Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D
3098 Rule Hond 1987 1988 - Sep lastSun 0:00 0 S
3099 Rule Hond 2006 only - May Sun>=1 0:00 1:00 D
3100 Rule Hond 2006 only - Aug Mon>=1 0:00 0 S
3101 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3102 Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
3103 -6:00 Hond C%sT
3104 #
3105 # Great Swan I ceded by US to Honduras in 1972
3106
3107 # Jamaica
3108 # Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
3109 # unspecified official document, and says "This time is used throughout the
3110 # island". Go with Milne. Round to the nearest second as required by zic.
3111 #
3112 # Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but
3113 # Lance Neita writes that Prime Minister Michael Manley decreed it January 5.
3114 # Assume Neita meant Jan 6 02:00, the same as the US. Neita also writes that
3115 # Manley's supporters associated this act with Manley's nickname "Joshua"
3116 # (recall that in the Bible the sun stood still at Joshua's request),
3117 # and with the Rod of Correction which Manley said he had received from
3118 # Haile Selassie, Emperor of Ethiopia. See:
3119 # Neita L. The politician in all of us. Jamaica Observer 2014-09-20
3120 # http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647
3121 #
3122 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3123 Zone America/Jamaica -5:07:11 - LMT 1890 # Kingston
3124 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3125 -5:00 - EST 1974
3126 -5:00 US E%sT 1984
3127 -5:00 - EST
3128
3129 # Martinique
3130 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3131 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
3132 -4:04:20 - FFMT 1911 May # Fort-de-France MT
3133 -4:00 - AST 1980 Apr 6
3134 -4:00 1:00 ADT 1980 Sep 28
3135 -4:00 - AST
3136
3137 # Montserrat
3138 # See America/Port_of_Spain.
3139
3140 # Nicaragua
3141 #
3142 # This uses Shanks & Pottenger for times before 2005.
3143 #
3144 # From Steffen Thorsen (2005-04-12):
3145 # I've got reports from 8 different people that Nicaragua just started
3146 # DST on Sunday 2005-04-10, in order to save energy because of
3147 # expensive petroleum. The exact end date for DST is not yet
3148 # announced, only "September" but some sites also say "mid-September".
3149 # Some background information is available on the President's official site:
3150 # http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm
3151 # The Decree, no 23-2005 is available here:
3152 # 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
3153 #
3154 # From Paul Eggert (2005-05-01):
3155 # The decree doesn't say anything about daylight saving, but for now let's
3156 # assume that it is daylight saving....
3157 #
3158 # From Gwillim Law (2005-04-21):
3159 # The Associated Press story on the time change, which can be found at
3160 # http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html
3161 # and elsewhere, says (fifth paragraph, translated from Spanish): "The last
3162 # time that a change of clocks was applied to save energy was in the year 2000
3163 # during the Arnoldo Alemán administration."...
3164 # The northamerica file says that Nicaragua has been on UTC-6 continuously
3165 # since December 1998. I wasn't able to find any details of Nicaraguan time
3166 # changes in 2000. Perhaps a note could be added to the northamerica file, to
3167 # the effect that we have indirect evidence that DST was observed in 2000.
3168 #
3169 # From Jesper Nørgaard Welen (2005-11-02):
3170 # Nicaragua left DST the 2005-10-02 at 00:00 (local time).
3171 # http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm
3172 # (2005-09-26)
3173 #
3174 # From Jesper Nørgaard Welen (2006-05-05):
3175 # http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410
3176 # (my informal translation)
3177 # By order of the president of the republic, Enrique Bolaños, Nicaragua
3178 # advanced by sixty minutes their official time, yesterday at 2 in the
3179 # morning, and will stay that way until 30th of September.
3180 #
3181 # From Jesper Nørgaard Welen (2006-09-30):
3182 # http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf
3183 # My informal translation runs:
3184 # The natural sun time is restored in all the national territory, in that the
3185 # time is returned one hour at 01:00 am of October 1 of 2006.
3186 #
3187 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3188 Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
3189 Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
3190 Rule Nic 2005 only - Apr 10 0:00 1:00 D
3191 Rule Nic 2005 only - Oct Sun>=1 0:00 0 S
3192 Rule Nic 2006 only - Apr 30 2:00 1:00 D
3193 Rule Nic 2006 only - Oct Sun>=1 1:00 0 S
3194 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3195 Zone America/Managua -5:45:08 - LMT 1890
3196 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
3197 -6:00 - CST 1973 May
3198 -5:00 - EST 1975 Feb 16
3199 -6:00 Nic C%sT 1992 Jan 1 4:00
3200 -5:00 - EST 1992 Sep 24
3201 -6:00 - CST 1993
3202 -5:00 - EST 1997
3203 -6:00 Nic C%sT
3204
3205 # Panama
3206 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3207 Zone America/Panama -5:18:08 - LMT 1890
3208 -5:19:36 - CMT 1908 Apr 22 # Colón Mean Time
3209 -5:00 - EST
3210 Link America/Panama America/Cayman
3211
3212 # Puerto Rico
3213 # There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
3214 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3215 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
3216 -4:00 - AST 1942 May 3
3217 -4:00 US A%sT 1946
3218 -4:00 - AST
3219
3220 # St Kitts-Nevis
3221 # St Lucia
3222 # See America/Port_of_Spain.
3223
3224 # St Pierre and Miquelon
3225 # There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
3226 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3227 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3228 -4:00 - AST 1980 May
3229 -3:00 - PMST 1987 # Pierre & Miquelon Time
3230 -3:00 Canada PM%sT
3231
3232 # St Vincent and the Grenadines
3233 # See America/Port_of_Spain.
3234
3235 # Turks and Caicos
3236 #
3237 # From Chris Dunn in
3238 # http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007
3239 # (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
3240 # daylight saving dates for time changes have been adjusted to match
3241 # the recent U.S. change of dates.
3242 #
3243 # From Brian Inglis (2007-04-28):
3244 # http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
3245 # there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
3246 # rows before that there is an out of date entry for Oct:
3247 # "Eastern Standard Times Begins 2007
3248 # Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
3249 # indicating that the normal ET rules are followed.
3250 #
3251 # From Paul Eggert (2014-08-19):
3252 # The 2014-08-13 Cabinet meeting decided to stay on UTC-4 year-round. See:
3253 # http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm
3254 # Model this as a switch from EST/EDT to AST ...
3255 # From Chris Walton (2014-11-04):
3256 # ... the TCI government appears to have delayed the switch to
3257 # "permanent daylight saving time" by one year....
3258 # http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm
3259 #
3260 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3261 Zone America/Grand_Turk -4:44:32 - LMT 1890
3262 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3263 -5:00 - EST 1979
3264 -5:00 US E%sT 2015 Nov Sun>=1 2:00
3265 -4:00 - AST
3266
3267 # British Virgin Is
3268 # Virgin Is
3269 # See America/Port_of_Spain.
3270
3271
3272 # Local Variables:
3273 # coding: utf-8
3274 # End: