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1# $OpenBSD: northamerica,v 1.5 1997/01/14 04:36:54 millert Exp $
2# @(#)northamerica 7.30
3# also includes Central America and the Caribbean
4
5# This data is by no means authoritative; if you think you know better,
6# go ahead and edit the file (and please send any changes to
7# tz@elsie.nci.nih.gov for general use in the future).
8
9# From Paul Eggert <eggert@twinsun.com> (1994-08-17):
10# A reliable and entertaining source about time zones is
11# Derek Howse, Greenwich time and the discovery of the longitude,
12# Oxford University Press (1980).
13
14###############################################################################
15
16# United States
17
18# From Paul Eggert <eggert@twinsun.com> (1995-12-19):
19# A good source for time zone historical data in the US is
20# Thomas G. Shanks, The American Atlas (5th edition),
21# San Diego: ACS Publications, Inc. (1991).
22# Make sure you have the errata sheet; the book is somewhat useless without it.
23# It is the source for the US and Puerto Rico entries below.
24
25# From Paul Eggert (1996-06-12):
26# Daylight Saving Time was first suggested as a joke by Benjamin Franklin
27# in his whimsical essay ``Turkey vs Eagle, McCauley is my Beagle'' (1784).
28# Not everyone is happy with the results:
29#
30# I don't really care how time is reckoned so long as there is some
31# agreement about it, but I object to being told that I am saving
32# daylight when my reason tells me that I am doing nothing of the kind.
33# I even object to the implication that I am wasting something
34# valuable if I stay in bed after the sun has risen. As an admirer
35# of moonlight I resent the bossy insistence of those who want to
36# reduce my time for enjoying it. At the back of the Daylight Saving
37# scheme I detect the bony, blue-fingered hand of Puritanism, eager
38# to push people into bed earlier, and get them up earlier, to make
39# them healthy, wealthy and wise in spite of themselves.
40#
41# -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday
42
43# From Arthur David Olson:
44# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
45# See, for example, the front page of the Saturday, 1974-10-26
46# and Sunday, 1974-10-27 editions of the Washington Post.
47
48# From Arthur David Olson:
49# Before the Uniform Time Act of 1966 took effect in 1967, observance of
50# Daylight Saving Time in the US was by local option, except during wartime.
51
52# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
53Rule US 1918 1919 - Mar lastSun 2:00 1:00 W # War
54Rule US 1918 1919 - Oct lastSun 2:00 0 S
55Rule US 1942 only - Feb 9 2:00 1:00 W # War
56Rule US 1945 only - Sep 30 2:00 0 S
57Rule US 1967 max - Oct lastSun 2:00 0 S
58Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
59Rule US 1974 only - Jan 6 2:00 1:00 D
60Rule US 1975 only - Feb 23 2:00 1:00 D
61Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
62Rule US 1987 max - Apr Sun>=1 2:00 1:00 D
63
64# From Bob Devine (1988-01-28):
65# ...Alaska (and Hawaii) had the timezone names changed in 1967.
66# old new
67# Pacific Standard Time(PST) -same-
68# Yukon Standard Time(YST) -same-
69# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
70# Nome Standard Time (NT) Bering Standard Time (BST)
71#
72# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
73# The YST zone now covers nearly all of the state, AHST just part
74# of the Aleutian islands. No DST.
75
76# From Paul Eggert (1995-12-19):
77# The tables below use `NST', not `NT', for Nome Standard Time.
78# I invented `CAWT' for Central Alaska War Time.
79
80# From U. S. Naval Observatory (1989-01-19):
81# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
82# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
83# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
84# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
85# USA MOUNTAIN 7 H BEHIND UTC DENVER
86# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
87# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
88# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
89# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
90# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
91# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
92# USA - " - 9 H BEHIND UTC APR 3 - OCT 30
93# USA HAWAII 10 H BEHIND UTC
94# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
95
96# From Arthur David Olson (1989-01-21):
97# The above dates are for 1988.
98# Note the "AKST" and "AKDT" abbreviations, the claim that there's
99# no DST in Samoa, and the claim that there is DST in Alaska and the
100# Aleutians.
101
102# From Arthur David Olson (1988-02-13):
103# Legal standard time zone names, from United States Code (1982 Edition and
104# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
105# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
106# took effect), as explained in sections 263 and 261:
107# (none)
108# United States standard eastern time
109# United States standard mountain time
110# United States standard central time
111# United States standard Pacific time
112# (none)
113# United States standard Alaska time
114# (none)
115# Next, names from 1967-04-01 until 1983-11-30 (the date for
116# public law 98-181):
117# Atlantic standard time
118# eastern standard time
119# central standard time
120# mountain standard time
121# Pacific standard time
122# Yukon standard time
123# Alaska-Hawaii standard time
124# Bering standard time
125# And after 1983-11-30:
126# Atlantic standard time
127# eastern standard time
128# central standard time
129# mountain standard time
130# Pacific standard time
131# Alaska standard time
132# Hawaii-Aleutian standard time
133# Samoa standard time
134# The law doesn't give abbreviations.
135#
136# From Paul Eggert (1995-12-19):
137# Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions.
138# Go with Shanks.
139
140# US Eastern time, represented by New York
141# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
142Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
143Rule NYC 1920 only - Oct lastSun 2:00 0 S
144Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
145Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
146Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
147# Zone NAME GMTOFF RULES FORMAT [UNTIL]
148Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00
149 -5:00 US E%sT 1920
150 -5:00 NYC E%sT 1942
151 -5:00 US E%sT 1946
152 -5:00 NYC E%sT 1967
153 -5:00 US E%sT
154
155# US Central time, represented by Chicago
156# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
157Rule Chicago 1920 only - Jun 13 2:00 1:00 D
158Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
159Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
160Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
161Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
162Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
163# Zone NAME GMTOFF RULES FORMAT [UNTIL]
164Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00
165 -6:00 US C%sT 1920
166 -6:00 Chicago C%sT 1936 Mar 1 2:00
167 -5:00 - EST 1936 Nov 15 2:00
168 -6:00 Chicago C%sT 1942
169 -6:00 US C%sT 1946
170 -6:00 Chicago C%sT 1967
171 -6:00 US C%sT
172
173# US Mountain time, represented by Denver
174# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
175Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
176Rule Denver 1920 only - Oct lastSun 2:00 0 S
177Rule Denver 1921 only - May 22 2:00 0 S
178Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
179Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
180# Zone NAME GMTOFF RULES FORMAT [UNTIL]
181Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00
182 -7:00 US M%sT 1920
183 -7:00 Denver M%sT 1942
184 -7:00 US M%sT 1946
185 -7:00 Denver M%sT 1967
186 -7:00 US M%sT
187
188# US Pacific time, represented by Los Angeles
189# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
190Rule CA 1948 only - Mar 14 2:00 1:00 D
191Rule CA 1949 only - Jan 1 2:00 0 S
192Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
193Rule CA 1950 1961 - Sep lastSun 2:00 0 S
194Rule CA 1962 1966 - Oct lastSun 2:00 0 S
195# Zone NAME GMTOFF RULES FORMAT [UNTIL]
196Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00
197 -8:00 US P%sT 1946
198 -8:00 CA P%sT 1967
199 -8:00 US P%sT
200
201# Alaska
202# AK%sT is the modern abbreviation for -9:00 per USNO.
203#
204# From Paul Eggert (1995-12-19):
205# Howse writes that Alaska switched from the Julian to the Gregorian calendar,
206# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
207# This was on 1867-10-18. We omit this transition, since we can't represent
208# changes from Julian to Gregorian.
209#
210# Zone NAME GMTOFF RULES FORMAT [UNTIL]
211Zone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00
212 -8:00 - PST 1942
213 -8:00 US P%sT 1946
214 -8:00 - PST 1969
215 -8:00 US P%sT 1983 Oct 30 2:00
216 -9:00 US AK%sT
217Zone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00
218 -9:00 - YST 1942
219 -9:00 US Y%sT 1946
220 -9:00 - YST 1969
221 -9:00 US Y%sT 1983 Oct 30 2:00
222 -9:00 US AK%sT
223Zone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00
224 -10:00 - CAT 1942
225 -10:00 US CAT/CAWT 1946
226 -10:00 - CAT 1967 Apr
227 -10:00 - AHST 1969
228 -10:00 US AH%sT 1983 Oct 30 2:00
229 -9:00 US AK%sT
230Zone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00
231 -11:00 - NST 1942
232 -11:00 US N%sT 1946
233 -11:00 - NST 1967 Apr
234 -11:00 - BST 1969
235 -11:00 US B%sT 1983 Oct 30 2:00
236 -9:00 US AK%sT
237Zone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00
238 -11:00 - NST 1942
239 -11:00 US N%sT 1946
240 -11:00 - NST 1967 Apr
241 -11:00 - BST 1969
242 -11:00 US B%sT 1983 Oct 30 2:00
243 -10:00 US HA%sT
244# Shanks writes that part of southwest Alaska (e.g. Aniak)
245# switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
246# and another part (e.g. Akiak) made the same switch five weeks later.
247# These switches don't quite make our 1970 cutoff.
248
249# Hawaii
250#
251# From Arthur David Olson:
252# And then there's Hawaii.
253# DST was observed for one day in 1933;
254# standard time was changed by half an hour in 1947;
255# it's always standard as of 1986.
256#
257# From Paul Eggert:
258# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.
259#
260Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00
261 -10:30 - HST 1933 Apr 30 2:00
262 -10:30 1:00 HDT 1933 May 21 2:00
263 -10:30 US H%sT 1947 Jun 8 2:00
264 -10:00 - HST
265
266Zone Pacific/Midway -11:49:28 - LMT 1901
267 -11:00 - NST 1967 Apr # N=Nome
268 -11:00 - BST 1983 Nov 30 # B=Bering
269 -11:00 - SST # S=Samoa
270
271# Now we turn to US areas that have diverged from the consensus since 1970.
272
273# Arizona mostly uses MST.
274Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00
275 -7:00 US M%sT 1944 Jan 1 00:01
276 -7:00 - MST 1944 Mar 17 00:01
277 -7:00 US M%sT 1944 Oct 1 00:01
278 -7:00 - MST 1967
279 -7:00 US M%sT 1968
280 -7:00 - MST
281# From Arthur David Olson (1988-02-13):
282# A writer from the Inter Tribal Council of Arizona, Inc.,
283# notes in private correspondence dated 12/28/87 that "Presently, only the
284# Navajo Nation participates in the Daylight Saving Time policy, due to its
285# large size and location in three states." (The "only" means that other
286# tribal nations don't use DST.)
287
288Link America/Denver America/Shiprock
289
290# Southern Idaho and eastern Oregon switched four weeks late in 1974.
291# Zone NAME GMTOFF RULES FORMAT [UNTIL]
292Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00
293 -8:00 US P%sT 1923 May 13 2:00
294 -7:00 US M%sT 1974
295 -7:00 - MST 1974 Feb 3 2:00
296 -7:00 US M%sT
297
298# Indiana
299#
300# From Paul Eggert (1995-12-19):
301# Indiana generally observes either EST all year, or CST/CDT,
302# but areas near Cincinnati and Louisville use those cities' timekeeping
303# and in 1969 and 1970 the whole state observed daylight time;
304# and there are other exceptions as noted below.
305# Shanks partitions Indiana into 345 regions, each with its own time history,
306# and writes ``Even newspaper reports present contradictory information.''
307# Fortunately, most of the complexity occurred before our cutoff date of 1970.
308#
309# Since 1970, EST-only Indiana has been like America/Indianapolis,
310# with exceptions noted below for Crawford, Starke, and Switzerland counties.
311# The parts of Indiana not listed below have been like America/Chicago,
312# America/Louisville, or America/New_York.
313#
314# Other than Indianapolis, the Indiana place names are so nondescript
315# that they would be ambiguous if we left them at the `America' level.
316# So we reluctantly put them all in a subdirectory `America/Indiana'.
317#
318# Most of EST-only Indiana last observed DST in 1970.
319# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
320Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
321Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
322Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
323# Zone NAME GMTOFF RULES FORMAT [UNTIL]
324Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00
325 -6:00 US C%sT 1920
326 -6:00 Indianapolis C%sT 1942
327 -6:00 US C%sT 1946
328 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
329 -5:00 - EST 1957 Sep 29 2:00
330 -6:00 - CST 1958 Apr 27 2:00
331 -5:00 - EST 1969
332 -5:00 US E%sT 1971
333 -5:00 - EST
334Link America/Indianapolis America/Indiana/Indianapolis
335#
336# Part of Crawford County, Indiana, last observed DST in 1975,
337# and left its clocks alone in 1974.
338# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
339Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
340Rule Marengo 1951 only - Sep lastSun 2:00 0 S
341Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
342Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
343# Zone NAME GMTOFF RULES FORMAT [UNTIL]
344Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00
345 -6:00 US C%sT 1951
346 -6:00 Marengo C%sT 1961 Apr 30 2:00
347 -5:00 - EST 1969
348 -5:00 US E%sT 1974 Jan 6 2:00
349 -6:00 1:00 CDT 1974 Oct 27 2:00
350 -5:00 US E%sT 1976
351 -5:00 - EST
352#
353# Starke County, Indiana
354# From Arthur David Olson (1991-10-28):
355# An article on page A3 of the Sunday, 1991-10-27 Washington Post
356# notes that Starke County switched from Central time to Eastern time as of
357# 1991-10-27.
358# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
359Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
360Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
361Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
362Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
363Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
364# Zone NAME GMTOFF RULES FORMAT [UNTIL]
365Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00
366 -6:00 US C%sT 1947
367 -6:00 Starke C%sT 1962 Apr 29 2:00
368 -5:00 - EST 1963 Oct 27 2:00
369 -6:00 US C%sT 1991 Oct 27 2:00
370 -5:00 - EST
371#
372# Switzerland County, Indiana, last observed DST in 1972.
373# Zone NAME GMTOFF RULES FORMAT [UNTIL]
374Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00
375 -6:00 US C%sT 1954 Apr 25 2:00
376 -5:00 - EST 1969
377 -5:00 US E%sT 1973
378 -5:00 - EST
379
380# Part of Kentucky left its clocks alone in 1974.
381# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
382Rule Louisville 1921 only - May 1 2:00 1:00 D
383Rule Louisville 1921 only - Sep 1 2:00 0 S
384Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
385Rule Louisville 1941 only - Sep lastSun 2:00 0 S
386Rule Louisville 1946 only - Jun 2 2:00 0 S
387Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
388Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
389# Zone NAME GMTOFF RULES FORMAT [UNTIL]
390Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00
391 -6:00 US C%sT 1921
392 -6:00 Louisville C%sT 1942
393 -6:00 US C%sT 1946
394 -6:00 Louisville C%sT 1961 Jul 23 2:00
395 -5:00 - EST 1968
396 -5:00 US E%sT 1974 Jan 6 2:00
397 -6:00 1:00 CDT 1974 Oct 27 2:00
398 -5:00 US E%sT
399
400# Michigan
401#
402# From Bob Devine (1988-01-28):
403# Michigan didn't observe DST from 1968 to 1973.
404#
405# From Paul Eggert (1995-12-19):
406# Shanks writes that Michigan started using standard time on 1885 Sep 18,
407# but Howse (p 126) writes that Detroit kept
408#
409# local time until 1900 when the City Council decreed that clocks should
410# be put back twenty-eight minutes to Central Standard Time. Half the
411# city obeyed, half refused. After considerable debate, the decision
412# was rescinded and the city reverted to Sun time. A derisive offer to
413# erect a sundial in front of the city hall was referred to the
414# Committee on Sewers. Then, in 1905, Central time was adopted
415# by city vote.
416#
417# This story is too entertaining to be false, so go with Howse over Shanks.
418#
419# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
420# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
421Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
422Rule Detroit 1948 only - Sep lastSun 2:00 0 S
423Rule Detroit 1967 only - Jun 14 2:00 1:00 D
424Rule Detroit 1967 only - Oct lastSun 2:00 0 S
425# Zone NAME GMTOFF RULES FORMAT [UNTIL]
426Zone America/Detroit -5:32:11 - LMT 1905
427 -6:00 - CST 1915 May 15 2:00
428 -5:00 - EST 1942
429 -5:00 US E%sT 1946
430 -5:00 Detroit E%sT 1973
431 -5:00 US E%sT 1975
432 -5:00 - EST 1975 Apr 27 2:00
433 -5:00 US E%sT
434#
435# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973.
436# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
437Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
438Rule Menominee 1946 only - Sep lastSun 2:00 0 S
439Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
440Rule Menominee 1966 only - Oct lastSun 2:00 0 S
441# Zone NAME GMTOFF RULES FORMAT [UNTIL]
442Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
443 -6:00 US C%sT 1946
444 -6:00 Menominee C%sT 1969 Apr 27 2:00
445 -5:00 - EST 1973 Apr 29 2:00
446 -6:00 US C%sT
447
448# Navassa
449# uninhabited
450
451
452# Old names, for S5 users
453
454# Link LINK-FROM LINK-TO
455Link America/New_York EST5EDT
456Link America/Chicago CST6CDT
457Link America/Denver MST7MDT
458Link America/Los_Angeles PST8PDT
459Link America/Indianapolis EST
460Link America/Phoenix MST
461Link Pacific/Honolulu HST
462
463################################################################################
464
465
466# From Paul Eggert <eggert@twinsun.com> (1996-11-22):
467# A good source for time zone historical data outside the US is
468# Thomas G. Shanks, The International Atlas (3rd edition),
469# San Diego: ACS Publications, Inc. (1991).
470#
471# Gwillim Law <LAW@encmail.encompass.com> writes that a good source
472# for recent time zone data is the International Air Transport
473# Association's Standard Schedules Information Manual (IATA SSIM),
474# published semiannually. Law sent in several helpful summaries
475# of the IATA's data after 1990.
476#
477# Except where otherwise noted, Shanks is the source for entries through 1990,
478# and IATA SSIM is the source for entries after 1990.
479#
480# Another source occasionally used is Edward W. Whitman, World Time Differences,
481# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
482# I found in the UCLA library.
483#
484# See the `europe' file for Greenland.
485#
486# See the `africa' file for time zone naming and abbreviation conventions.
487
488# Canada
489
490# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14):
491# I post here the time zone abbreviations standardized in Canada
492# for both English and French in the CAN/CSA-Z234.4-89 standard....
493#
494# UTC Standard time Daylight savings time
495# offset French English French English
496# -2:30 - - HAT NDT
497# -3 - - HAA ADT
498# -3:30 HNT NST - -
499# -4 HNA AST HAE EDT
500# -5 HNE EST HAC CDT
501# -6 HNC CST HAR MDT
502# -7 HNR MST HAP PDT
503# -8 HNP PST HAY YDT
504# -9 HNY YST - -
505#
506# HN: Heure Normale ST: Standard Time
507# HA: Heure Avanc<e'>e DT: Daylight saving Time
508#
509# A: de l'Atlantique Atlantic
510# C: du Centre Central
511# E: de l'Est Eastern
512# M: Mountain
513# N: Newfoundland
514# P: du Pacifique Pacific
515# R: des Rocheuses
516# T: de Terre-Neuve
517# Y: du Yukon Yukon
518#
519# From Paul Eggert <eggert@twinsun.com> (1994-11-22):
520# Alas, this sort of thing must be handled by localization software.
521
522# The data for Canada are all from Shanks (1991).
523
524
525# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
526Rule Canada 1918 only - Apr 14 2:00 1:00 D
527Rule Canada 1918 only - Oct 31 2:00 0 S
528Rule Canada 1942 only - Feb 9 2:00 1:00 D
529Rule Canada 1945 only - Sep 30 2:00 0 S
530Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
531Rule Canada 1974 max - Oct lastSun 2:00 0 S
532Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D
533
534
535# Newfoundland (except Labrador)
536
537# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
538Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D
539Rule StJohns 1917 only - Sep 17 2:00 0 S
540Rule StJohns 1918 only - Oct 31 2:00 0 S
541# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks.
542Rule StJohns 1919 only - May 5 23:00 1:00 D
543Rule StJohns 1919 only - Aug 12 23:00 0 S
544# For 1931-1935 Whitman gives Apr same date; go with Shanks.
545Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
546Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
547# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman.
548Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D
549Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S
550# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman.
551Rule StJohns 1942 only - Mar 1 0:00 1:00 D
552Rule StJohns 1942 only - Dec 31 0:00 0 S
553Rule StJohns 1943 only - May 30 0:00 1:00 D
554Rule StJohns 1943 only - Sep 5 0:00 0 S
555Rule StJohns 1944 only - Jul 10 0:00 1:00 D
556Rule StJohns 1944 only - Sep 2 0:00 0 S
557Rule StJohns 1945 only - Jan 1 0:00 1:00 D
558Rule StJohns 1945 only - Oct 7 2:00 0 S
559# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
560# Apr 30 - Sep 24; go with Shanks.
561Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
562Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
563Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
564Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
565Rule StJohns 1960 max - Oct lastSun 2:00 0 S
566Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D
567Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD
568Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D
569# St John's has an apostrophe, but Posix file names can't have apostrophes.
570# Zone NAME GMTOFF RULES FORMAT [UNTIL]
571Zone America/St_Johns -3:30:52 - LMT 1884
572 -3:30:52 StJohns N%sT 1935 Mar 30
573 -3:30 StJohns N%sT
574
575
576# east Labrador
577
578# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
579# Zone NAME GMTOFF RULES FORMAT [UNTIL]
580Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
581 -3:30:52 StJohns NST 1919
582 -3:30:52 - NST 1935 Mar 30
583 -3:30 - NST 1936
584 -3:30 StJohns N%sT 1966 Mar 15 2:00
585 -4:00 StJohns A%sT
586
587
588# west Labrador, New Brunswick, Nova Scotia, Prince Edward I
589
590# From Paul Eggert (1996-06-12):
591# Shanks writes that since 1970 most of this region has been like Halifax.
592# Many locales did not observe peacetime DST until 1972;
593# Glace Bay, NS is the largest that we know of.
594# Shanks also writes that Liverpool, NS was the only town in Canada to observe
595# DST in 1971 but not 1970; for now we'll assume this is a typo.
596
597# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
598Rule Halifax 1916 only - Apr 1 0:00 1:00 D
599Rule Halifax 1916 only - Oct 1 0:00 0 S
600Rule Halifax 1918 only - Apr 14 2:00 1:00 D
601Rule Halifax 1918 only - Oct 31 2:00 0 S
602Rule Halifax 1920 only - May 9 0:00 1:00 D
603Rule Halifax 1920 only - Aug 29 0:00 0 S
604Rule Halifax 1921 only - May 6 0:00 1:00 D
605Rule Halifax 1921 1922 - Sep 5 0:00 0 S
606Rule Halifax 1922 only - Apr 30 0:00 1:00 D
607Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
608Rule Halifax 1923 only - Sep 4 0:00 0 S
609Rule Halifax 1924 only - Sep 15 0:00 0 S
610Rule Halifax 1925 only - Sep 28 0:00 0 S
611Rule Halifax 1926 only - May 16 0:00 1:00 D
612Rule Halifax 1926 only - Sep 13 0:00 0 S
613Rule Halifax 1927 only - May 1 0:00 1:00 D
614Rule Halifax 1927 only - Sep 26 0:00 0 S
615Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
616Rule Halifax 1928 only - Sep 9 0:00 0 S
617Rule Halifax 1929 only - Sep 3 0:00 0 S
618Rule Halifax 1930 only - Sep 15 0:00 0 S
619Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
620Rule Halifax 1933 only - Apr 30 0:00 1:00 D
621Rule Halifax 1933 only - Oct 2 0:00 0 S
622Rule Halifax 1934 only - May 20 0:00 1:00 D
623Rule Halifax 1934 only - Sep 16 0:00 0 S
624Rule Halifax 1935 only - Jun 2 0:00 1:00 D
625Rule Halifax 1935 only - Sep 30 0:00 0 S
626Rule Halifax 1936 only - Jun 1 0:00 1:00 D
627Rule Halifax 1936 only - Sep 14 0:00 0 S
628Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
629Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
630Rule Halifax 1939 only - May 28 0:00 1:00 D
631Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
632Rule Halifax 1942 only - Feb 9 2:00 1:00 D
633Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S
634Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D
635Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D
636Rule Halifax 1962 max - Oct lastSun 2:00 0 S
637Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D
638# Zone NAME GMTOFF RULES FORMAT [UNTIL]
639Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
640 -4:00 Halifax A%sT
641Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
642 -4:00 Canada A%sT 1953
643 -4:00 Halifax A%sT 1954
644 -4:00 - AST 1972
645 -4:00 Halifax A%sT
646
647
648# Ontario, Quebec
649
650# From Paul Eggert (1996-06-12):
651# Shanks writes that since 1970 most of this region has been like Montreal.
652# Thunder Bay skipped DST in 1973.
653# Many smaller locales did not observe peacetime DST until 1974;
654# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
655# Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
656
657# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
658Rule Mont 1917 only - Mar 25 2:00 1:00 D
659Rule Mont 1917 only - Apr 24 0:00 0 S
660Rule Mont 1918 only - Apr 14 2:00 1:00 D
661Rule Mont 1918 only - Oct 31 2:00 0 S
662Rule Mont 1919 only - Mar 31 2:30 1:00 D
663Rule Mont 1919 only - Oct 25 2:30 0 S
664Rule Mont 1920 only - May 2 2:30 1:00 D
665Rule Mont 1920 only - Oct 3 2:30 0 S
666Rule Mont 1921 only - May 1 2:00 1:00 D
667Rule Mont 1921 only - Oct 2 2:30 0 S
668Rule Mont 1922 only - Apr 30 2:00 1:00 D
669Rule Mont 1922 only - Oct 1 2:30 0 S
670Rule Mont 1924 only - May 17 2:00 1:00 D
671Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
672Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
673Rule Mont 1927 only - May 1 0:00 1:00 D
674Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S
675Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D
676Rule Mont 1932 only - May 1 0:00 1:00 D
677Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D
678Rule Mont 1933 only - Oct 1 0:00 0 S
679Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S
680Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
681Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D
682Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
683Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
684Rule Mont 1957 max - Oct lastSun 2:00 0 S
685Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D
686# Zone NAME GMTOFF RULES FORMAT [UNTIL]
687Zone America/Montreal -4:54:16 - LMT 1884
688 -5:00 Mont E%sT
689Zone America/Thunder_Bay -5:57:00 - LMT 1895
690 -5:00 Canada E%sT 1970
691 -5:00 Mont E%sT 1973
692 -5:00 - EST 1974
693 -5:00 Canada E%sT
694Zone America/Nipigon -5:53:04 - LMT 1895
695 -5:00 Canada E%sT
696Zone America/Rainy_River -6:17:56 - LMT 1895
697 -6:00 Canada C%sT
698
699
700# Manitoba
701
702# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
703Rule Winn 1916 only - Apr 23 0:00 1:00 D
704Rule Winn 1916 only - Sep 17 0:00 0 S
705Rule Winn 1918 only - Apr 14 2:00 1:00 D
706Rule Winn 1918 only - Oct 31 2:00 0 S
707Rule Winn 1937 only - May 16 2:00 1:00 D
708Rule Winn 1937 only - Sep 26 2:00 0 S
709Rule Winn 1942 only - Feb 9 2:00 1:00 D
710Rule Winn 1945 only - Sep lastSun 2:00 0 S
711Rule Winn 1946 only - May 12 2:00 1:00 D
712Rule Winn 1946 only - Oct 13 2:00 0 S
713Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
714Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
715Rule Winn 1950 only - May 1 2:00 1:00 D
716Rule Winn 1950 only - Sep 30 2:00 0 S
717Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
718Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
719Rule Winn 1959 only - Oct lastSun 2:00 0 S
720Rule Winn 1960 only - Sep lastSun 2:00 0 S
721Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
722Rule Winn 1963 only - Sep 22 2:00 0 S
723Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D
724Rule Winn 1966 max - Oct lastSun 2:00 0 S
725Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D
726# Zone NAME GMTOFF RULES FORMAT [UNTIL]
727Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
728 -6:00 Winn C%sT
729
730
731# Saskatchewan
732
733# From Paul Eggert (1996-06-12):
734# Shanks writes that since 1970 most of this region has been like Regina.
735# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
736# Other western towns (e.g. Lloydminster) are like Edmonton.
737
738# From W. Jones <jones@skdad.usask.ca> (1992-11-06):
739# The. . .below is based on information I got from our law library, the
740# provincial archives, and the provincial Community Services department.
741# A precise history would require digging through newspaper archives, and
742# since you didn't say what you wanted, I didn't bother.
743#
744# Saskatchewan is split by a time zone meridian (105W) and over the years
745# the boundary became pretty ragged as communities near it reevaluated
746# their affiliations in one direction or the other. In 1965 a provincial
747# referendum favoured legislating common time practices.
748#
749# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
750# Saskatchewan 1978) was proclaimed, and established that the eastern
751# part of Saskatchewan would use CST year round, that districts in
752# northwest Saskatchewan would by default follow CST but could opt to
753# follow Mountain Time rules (thus 1 hour difference in the winter and
754# zero in the summer), and that districts in southwest Saskatchewan would
755# by default follow MT but could opt to follow CST.
756#
757# It took a few years for the dust to settle (I know one story of a town
758# on one time zone having its school in another, such that a mom had to
759# serve her family lunch in two shifts), but presently it seems that only
760# a few towns on the border with Alberta (e.g. Lloydminster) follow MT
761# rules any more; all other districts appear to have used CST year round
762# since sometime in the 1960s.
763
764# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
765Rule Regina 1918 only - Apr 14 2:00 1:00 D
766Rule Regina 1918 only - Oct 31 2:00 0 S
767Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
768Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
769Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
770Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
771Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
772Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
773Rule Regina 1942 only - Feb 9 2:00 1:00 D
774Rule Regina 1945 only - Sep lastSun 2:00 0 S
775Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
776Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
777Rule Regina 1947 1959 - Apr lastSun 2:00 1:00 D
778Rule Regina 1947 1958 - Sep lastSun 2:00 0 S
779Rule Regina 1959 only - Oct lastSun 2:00 0 S
780#
781Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
782Rule Swift 1957 only - Oct lastSun 2:00 0 S
783Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
784Rule Swift 1959 only - Oct lastSun 2:00 0 S
785Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
786# Zone NAME GMTOFF RULES FORMAT [UNTIL]
787Zone America/Regina -6:58:36 - LMT 1905 Sep
788 -7:00 Regina M%sT 1960 Apr lastSun 2:00
789 -6:00 - CST
790Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
791 -7:00 Canada M%sT 1946 Apr lastSun 2:00
792 -7:00 Regina M%sT 1950
793 -7:00 Swift M%sT 1972 Apr lastSun 2:00
794 -6:00 - CST
795
796
797# Alberta
798
799# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
800Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
801Rule Edm 1918 only - Oct 31 2:00 0 S
802Rule Edm 1919 only - May 27 2:00 0 S
803Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
804Rule Edm 1920 only - Oct lastSun 2:00 0 S
805Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
806Rule Edm 1942 only - Feb 9 2:00 1:00 D
807Rule Edm 1945 only - Sep lastSun 2:00 0 S
808Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
809Rule Edm 1947 only - Sep lastSun 2:00 0 S
810Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
811Rule Edm 1967 only - Oct lastSun 2:00 0 S
812Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
813Rule Edm 1969 only - Oct lastSun 2:00 0 S
814Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
815Rule Edm 1972 max - Oct lastSun 2:00 0 S
816Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D
817# Zone NAME GMTOFF RULES FORMAT [UNTIL]
818Zone America/Edmonton -7:33:52 - LMT 1906 Sep
819 -7:00 Edm M%sT
820
821
822# British Columbia
823
824# From Paul Eggert (1996-06-12):
825# Shanks writes that since 1970 most of this region has been like Vancouver.
826# Dawswon Creek uses MST. Much of east BC is like Edmonton.
827
828# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
829Rule Vanc 1918 only - Apr 14 2:00 1:00 D
830Rule Vanc 1918 only - Oct 31 2:00 0 S
831Rule Vanc 1942 only - Feb 9 2:00 1:00 D
832Rule Vanc 1945 only - Sep 30 2:00 0 S
833Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
834Rule Vanc 1946 only - Oct 13 2:00 0 S
835Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
836Rule Vanc 1962 max - Oct lastSun 2:00 0 S
837Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D
838# Zone NAME GMTOFF RULES FORMAT [UNTIL]
839Zone America/Vancouver -8:12:28 - LMT 1884
840 -8:00 Vanc P%sT
841Zone America/Dawson_Creek -8:00:56 - LMT 1884
842 -8:00 Canada P%sT 1947
843 -8:00 Vanc P%sT 1972 Aug 30 2:00
844 -7:00 - MST
845
846
847# Northwest Territories, Yukon
848
849# From Paul Eggert (1996-10-07):
850# Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
851# Shanks's table for Watson Lake is corrupted, so we have no data there.
852# Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs:
853# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
854# c. 7 defines Yukon standard time as UTC-9. This is still valid;
855# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
856# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
857# * O.I.C. 1980/02 established DST.
858# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
859# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander.
860
861# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
862Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
863Rule NT_YK 1918 only - Oct 27 2:00 0 S
864Rule NT_YK 1919 only - May 25 2:00 1:00 D
865Rule NT_YK 1919 only - Nov 1 0:00 0 S
866Rule NT_YK 1942 only - Feb 9 2:00 1:00 D
867Rule NT_YK 1945 only - Sep 30 2:00 0 S
868Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
869Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
870Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
871Rule NT_YK 1980 max - Oct lastSun 2:00 0 S
872Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D
873# Zone NAME GMTOFF RULES FORMAT [UNTIL]
874Zone America/Pangnirtung -4:22:56 - LMT 1884
875 -4:00 NT_YK A%sT
876Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay
877 -5:00 NT_YK E%sT
878Zone America/Rankin_Inlet -6:08:40 - LMT 1884
879 -6:00 NT_YK C%sT
880Zone America/Yellowknife -7:37:24 - LMT 1884
881 -7:00 NT_YK M%sT
882Zone America/Inuvik -8:54:00 - LMT 1884
883 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
884 -7:00 NT_YK M%sT
885Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
886 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
887 -8:00 NT_YK P%sT
888Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
889 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
890 -8:00 NT_YK P%sT
891
892
893###############################################################################
894
895# Mexico
896
897# From Guy Harris:
898# Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
899# Rules prior to 1987 are unknown.
900# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
901# observe DST." This is presumably Baja California Norte, above 28th parallel,
902# as listed there; [there is also] "Baja California Sur and N. Pacific
903# Coast (States of Sinaloa and Sonora)."
904
905# From Bob Devine (1988-01-28):
906# The Federal District (where Mexico City is) has observed [DST] several
907# times but not recently.
908#
909# I don't where to drawn the line in the North Baja area. 28th latitude
910# sounds good -- but it may be higher (how far [d]o radio stations from
911# San Diego affect culture?).
912#
913# The dates of DST probably go back to 1981. The rules are the same as
914# US's. This is going to be a headache for US presidential electi[o]n years!
915
916# From Arthur David Olson (1988-02-13)
917# Since the 1981 starting date is only "probable," we'll keep the 1987
918# starting date below.
919
920# From U. S. Naval Observatory (1989-01-19):
921# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
922# MEXICO BAJA CAL N N. PACIFIC COAST (STATES
923# MEXICO BAJA CAL N OF SINALOA AND SONORA)
924# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
925# MEXICO BAJA CAL N - OCT 29
926# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
927# MEXICO BAJA CAL N - 0CT 29
928# MEXICO 6 H BEHIND UTC STATES OF DURANGO,
929# MEXICO COAHUILA, NUEVO LEON,
930# MEXICO TAMAULIPAS
931# MEXICO 5 H BEHIND UTC STATES OF DURANGO,
932# MEXICO COAHUILA, NUEVO LEON,
933# MEXICO TAMAULIPAS APR 3 - OCT 29
934# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
935# MEXICO CAMPECHE, QUINTANA ROO AND
936# MEXICO YUCATAN
937
938# From Arthur David Olson (1989-01-21):
939# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
940# USNO claims there should be four Mexican zones rather than three:
941# a zone that's GMT-8 with DST; a zone that's always GMT-7;
942# a zone that's GMT-6 with DST; and a zone that's always GMT-6.
943
944# From Paul Eggert <eggert@twinsun.com> (1993-11-18):
945# Shanks also says there are four zones, but disagrees about the fourth.
946# Instead of GMT-6 with DST, he says there's GMT-8 without DST.
947
948# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
949# A guy from our Mexico subsidiary finally found the Presidential Decree
950# outlining the timezone changes in Mexico.
951#
952# ------------- Begin Forwarded Message -------------
953#
954# I finally got my hands on the Official Presidential Decree that sets up the
955# rules for the DST changes. The rules are:
956#
957# 1. The country is divided in 3 timezones:
958# - Baja California Norte (the Mexico/BajaNorte TZ)
959# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
960# - The rest of the country (the Mexico/General TZ)
961#
962# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
963# at 2:00 AM, the times in each zone are as follows:
964# BajaNorte: GMT+7
965# BajaSur: GMT+6
966# General: GMT+5
967#
968# 3. The rest of the year, the times are as follows:
969# BajaNorte: GMT+8
970# BajaSur: GMT+7
971# General: GMT+6
972#
973# The Decree was published in Mexico's Official Newspaper on January 4th.
974#
975# -------------- End Forwarded Message --------------
976# From Paul Eggert (1996-06-12):
977# For an English translation of the decree,
978# see ``Diario Oficial: Time Zone Changeover'',
979# <URL:http://mexico-travel.com/extra/timezone_eng.html> (1996-01-04).
980
981# From Shanks (1991):
982# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
983Rule Mexico 1939 only - Feb 5 0:00 1:00 D
984Rule Mexico 1939 only - Jun 25 0:00 0 S
985Rule Mexico 1940 only - Dec 9 0:00 1:00 D
986Rule Mexico 1941 only - Apr 1 0:00 0 S
987Rule Mexico 1943 only - Dec 16 0:00 1:00 D
988Rule Mexico 1944 only - May 1 0:00 0 S
989Rule Mexico 1950 only - Feb 12 0:00 1:00 D
990Rule Mexico 1950 only - Jul 30 0:00 0 S
991Rule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D
992Rule Mexico 1996 max - Oct lastSun 2:00 0 S
993#
994Rule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D
995Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S
996Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S
997# Zone NAME GMTOFF RULES FORMAT [UNTIL]
998Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
999 -7:00 - MST 1927 Jun 10 23:00
1000 -6:00 - CST 1930 Nov 15
1001 -7:00 - MST 1931 May 1 23:00
1002 -6:00 - CST 1931 Oct
1003 -7:00 - MST 1932 Mar 30 23:00
1004 -6:00 Mexico C%sT
1005Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
1006 -7:00 - MST 1927 Jun 10 23:00
1007 -6:00 - CST 1930 Nov 15
1008 -7:00 - MST 1931 May 1 23:00
1009 -6:00 - CST 1931 Oct
1010 -7:00 - MST 1932 Mar 30 23:00
1011 -6:00 - CST 1942 Apr
1012 -7:00 - MST 1949 Jan 14
1013 -8:00 - PST 1970
1014 -7:00 Mexico M%sT
1015Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
1016 -8:00 - PST 1927 Jun 10 23:00
1017 -7:00 - MST 1930 Nov 16
1018 -8:00 - PST 1942 Apr
1019 -7:00 - MST 1949 Jan 14
1020 -8:00 BajaN P%sT 1967 Apr lastSun 2:00
1021 -8:00 US P%sT 1996
1022 -8:00 Mexico P%sT
1023Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32
1024 -8:00 - PST 1927 Jun 10 23:00
1025 -7:00 - MST 1930 Nov 16
1026 -8:00 - PST 1942 Apr
1027 -7:00 - MST 1949 Jan 14
1028 -8:00 - PST 1996
1029 -8:00 Mexico P%sT
1030#
1031# Revillagigedo Is
1032# no information
1033
1034###############################################################################
1035
1036# Anguilla
1037# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1038Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
1039 -4:00 - AST
1040
1041# Antigua and Barbuda
1042# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1043Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
1044 -5:00 - EST 1951
1045 -4:00 - AST
1046
1047# Bahamas
1048# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1049Rule Bahamas 1964 max - Oct lastSun 2:00 0 S
1050Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D
1051Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D
1052# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1053Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
1054 -5:00 Bahamas E%sT
1055
1056# Barbados
1057# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1058Rule Barb 1977 only - Jun 12 2:00 1:00 D
1059Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
1060Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
1061Rule Barb 1979 only - Sep 30 2:00 0 S
1062Rule Barb 1980 only - Sep 25 2:00 0 S
1063# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1064Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
1065 -3:58 - BMT 1932 # Bridgetown Mean Time
1066 -4:00 Barb A%sT
1067
1068# Belize
1069# Whitman entirely disagrees with Shanks; go with Shanks.
1070# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1071Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
1072Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
1073Rule Belize 1973 only - Dec 5 0:00 1:00 D
1074Rule Belize 1974 only - Feb 9 0:00 0 S
1075Rule Belize 1982 only - Dec 18 0:00 1:00 D
1076Rule Belize 1983 only - Feb 12 0:00 0 S
1077# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1078Zone America/Belize -5:52:48 - LMT 1912 Apr
1079 -6:00 Belize C%sT
1080
1081# Bermuda
1082# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1083Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
1084 -4:00 - AST 1974 Apr 28 2:00
1085 -4:00 Bahamas A%sT
1086
1087# Cayman Is
1088# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1089Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
1090 -5:07 - KMT 1912 Feb # Kingston Mean Time
1091 -5:00 - EST
1092
1093# Clipperton
1094# uninhabited
1095
1096# Costa Rica
1097# Shanks gives some very odd dates for 1991, and stops there.
1098# For now, we won't guess further.
1099# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1100Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
1101Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
1102Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
1103# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks.
1104Rule CR 1991 only - Jul 1 0:00 0 S
1105Rule CR 1992 only - Mar 15 0:00 0 S
1106# There are too many San Joses elsewhere, so we'll use `Costa Rica'.
1107# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1108Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
1109 -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time
1110 -6:00 CR C%sT
1111# Coco
1112# no information; probably like America/Costa_Rica
1113
1114# Cuba
1115
1116# From Bob Devine (1988-01-28):
1117# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981.
1118# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March
1119# (I think).
1120
1121# From U. S. Naval Observatory (1989-01-19):
1122# CUBA 5 H BEHIND UTC
1123# CUBA 4 H BEHIND UTC MAR 20 - OCT 8
1124
1125# From Shanks (1991):
1126# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1127Rule Cuba 1928 only - Jun 10 0:00 1:00 D
1128Rule Cuba 1928 only - Oct 10 0:00 0 S
1129Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
1130Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
1131Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
1132Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
1133Rule Cuba 1965 only - Jun 1 0:00 1:00 D
1134Rule Cuba 1965 only - Sep 30 0:00 0 S
1135Rule Cuba 1966 only - May 29 0:00 1:00 D
1136Rule Cuba 1966 only - Oct 2 0:00 0 S
1137Rule Cuba 1967 only - Apr 8 0:00 1:00 D
1138Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
1139Rule Cuba 1968 only - Apr 14 0:00 1:00 D
1140Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
1141Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
1142Rule Cuba 1972 1974 - Oct 8 0:00 0 S
1143Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
1144Rule Cuba 1978 only - May 7 0:00 1:00 D
1145Rule Cuba 1978 1980 - Oct Sun>=8 0:00 0 S
1146Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
1147Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
1148Rule Cuba 1981 1990 - Oct Sun>=8 0:00 0 S
1149Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
1150Rule Cuba 1990 max - Apr Sun>=1 0:00 1:00 D
1151Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
1152Rule Cuba 1996 max - Oct Sun>=1 0:00s 0 S
1153
1154# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1155Zone America/Havana -5:29:28 - LMT 1890
1156 -5:30 - HMT 1925 Jul 19 12:00 # Havana MT
1157 -5:00 Cuba C%sT
1158
1159# Dominica
1160# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1161Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
1162 -4:00 - AST
1163
1164# Dominican Republic
1165# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1166Rule DR 1966 only - Oct 30 0:00 1:00 D
1167Rule DR 1967 only - Feb 28 0:00 0 S
1168Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
1169Rule DR 1970 only - Feb 21 0:00 0 S
1170Rule DR 1971 only - Jan 20 0:00 0 S
1171Rule DR 1972 1974 - Jan 21 0:00 0 S
1172# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1173Zone America/Santo_Domingo -4:39:36 - LMT 1890
1174 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
1175 -5:00 DR E%sT 1974 Oct 27
1176 -4:00 - AST
1177
1178# El Salvador
1179# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1180Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
1181Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
1182# There are too many San Salvadors elsewhere, so we'll use `El Salvador'.
1183# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1184Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
1185 -6:00 Salv C%sT
1186
1187# Grenada
1188# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1189Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
1190 -4:00 - AST
1191
1192# Guadeloupe
1193# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1194Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
1195 -4:00 - AST
1196
1197# Guatemala
1198# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1199Rule Guat 1973 only - Nov 25 0:00 1:00 D
1200Rule Guat 1974 only - Feb 24 0:00 0 S
1201Rule Guat 1983 only - May 21 0:00 1:00 D
1202Rule Guat 1983 only - Sep 22 0:00 0 S
1203Rule Guat 1991 only - Mar 23 0:00 1:00 D
1204Rule Guat 1991 only - Sep 7 0:00 0 S
1205# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1206Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
1207 -6:00 Guat C%sT
1208
1209# Haiti
1210# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1211Rule Haiti 1983 only - May 8 0:00 1:00 D
1212Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
1213Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
1214# Shanks says AT is 2:00, but IATA SSIM (1991/1996) says 1:00s. Go with IATA.
1215Rule Haiti 1988 max - Apr Sun>=1 1:00s 1:00 D
1216Rule Haiti 1988 max - Oct lastSun 1:00s 0 S
1217# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1218Zone America/Port-au-Prince -4:49:20 - LMT 1890
1219 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
1220 -5:00 Haiti E%sT
1221
1222# Honduras
1223# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1.
1224# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1225Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
1226 -6:00 Salv C%sT
1227
1228# Jamaica
1229
1230# From Bob Devine (1988-01-28):
1231# Follows US rules.
1232
1233# From U. S. Naval Observatory (1989-01-19):
1234# JAMAICA 5 H BEHIND UTC
1235
1236# From Shanks (1991):
1237# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1238Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
1239 -5:07 - KMT 1912 Feb # Kingston Mean Time
1240 -5:00 - EST 1974 Jan 6 2:00
1241 -5:00 US E%sT 1984
1242 -5:00 - EST
1243
1244# Martinique
1245# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1246Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
1247 -4:04 - FFMT 1911 May # Fort-de-France MT
1248 -4:00 - AST 1980 Apr 6
1249 -4:00 1:00 ADT 1980 Sep 28
1250 -4:00 - AST
1251
1252# Montserrat
1253# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1254Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Plymouth
1255 -4:00 - AST
1256
1257# Nicaragua
1258# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1259Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
1260Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
1261Rule Nic 1992 only - Jan 1 4:00 1:00 D
1262Rule Nic 1992 only - Sep 24 0:00 0 S
1263# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1264Zone America/Managua -5:45:08 - LMT 1890
1265 -5:45 - MMT 1934 Jun 23 # Managua Mean Time
1266 -6:00 - CST 1973 May
1267 -5:00 - EST 1975 Feb 16
1268 -6:00 Nic C%sT 1993 Jan 1 4:00
1269 -5:00 - EST
1270
1271# Panama
1272# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1273Zone America/Panama -5:18:08 - LMT 1890
1274 -5:20 - PMT 1908 Apr 22 # Panama Mean Time
1275 -5:00 - EST
1276
1277# Puerto Rico
1278# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
1279# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1280Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
1281 -4:00 - AST 1942 May 3
1282 -4:00 1:00 AWT 1945 Sep 30 2:00
1283 -4:00 - AST
1284
1285# St Kitts-Nevis
1286# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1287Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
1288 -4:00 - AST
1289
1290# St Lucia
1291# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1292Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
1293 -4:04 - CMT 1912 # Castries Mean Time
1294 -4:00 - AST
1295
1296# St Pierre and Miquelon
1297# There are too many St Pierres elsewhere, so we'll use `Miquelon'.
1298# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1299Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
1300 -4:00 - AST 1980 May
1301 -3:00 Mont PM%sT # Pierre & Miquelon Time
1302
1303# St Vincent and the Grenadines
1304# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1305Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
1306 -4:05 - KMT 1912 # Kingstown Mean Time
1307 -4:00 - AST
1308
1309# Turks and Caicos
1310# From Paul Eggert (1996-11-22):
1311# Shanks says they use US DST rules, but IATA SSIM (1991/1996)
1312# says they switch at midnight. Go with IATA SSIM.
1313# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1314Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D
1315Rule TC 1979 max - Oct lastSun 0:00 0 S
1316Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D
1317# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1318Zone America/Grand_Turk -4:44:32 - LMT 1890
1319 -5:07 - KMT 1912 Feb # Kingston Mean Time
1320 -5:00 TC E%sT
1321
1322# British Virgin Is
1323# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1324Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
1325 -4:00 - AST
1326
1327# Virgin Is
1328# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1329Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
1330 -4:00 - AST