1# @(#)northamerica 7.11
2# also includes Central America and the Caribbean
3
4# This data is by no means authoritative; if you think you know better,
5# go ahead and edit the file (and please send any changes to
6# tz@elsie.nci.nih.gov for general use in the future).
7
8# From Paul Eggert <eggert@twinsun.com> (August 17, 1994):
9# A reliable and entertaining source about time zones is
10# Derek Howse, Greenwich time and the discovery of the longitude,
11# Oxford University Press (1980).
12
13###############################################################################
14
15# United States
16
17# From Arthur David Olson:
18# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
19# See, for example, the front page of the Saturday, October 26, 1974
20# and Sunday, October 27, 1974 editions of the Washington Post.
21
22# From seismo!munnari!kre:
23# I recall also being told by someone once that Canada didn't have
24# the DST variations in 74/75 that the US did, but I am not nearly
25# sure enough of this to add anything.
26
27# From Arthur David Olson:
28# The above has been confirmed by Bob Devine; we'll go with it here.
29
30# From Arthur David Olson:
31# Before the Uniform Time Act of 1966 took effect in 1967, observance of
32# Daylight Saving Time in the US was by local option, except during wartime.
33
34# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
35Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
36Rule US 1918 1919 - Oct lastSun 2:00 0 S
37Rule US 1942 only - Feb 9 2:00 1:00 W # War
38Rule US 1945 only - Sep 30 2:00 0 S
39Rule US 1967 max - Oct lastSun 2:00 0 S
40Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
41Rule US 1974 only - Jan 6 2:00 1:00 D
42Rule US 1975 only - Feb 23 2:00 1:00 D
43Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
44Rule US 1987 max - Apr Sun>=1 2:00 1:00 D
45
46# From Bob Devine (January 28, 1988):
47# ...Alaska (and Hawaii) had the timezone names changed in 1967.
48# old new
49# Pacific Standard Time(PST) -same-
50# Yukon Standard Time(YST) -same-
51# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
52# Nome Standard Time (NT) Bering Standard Time (BST)
53#
54# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
55# The YST zone now covers nearly all of the state, AHST just part
56# of the Aleutian islands. No DST.
57
58# From U. S. Naval Observatory (January 19, 1989):
59# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
60# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
61# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
62# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
63# USA MOUNTAIN 7 H BEHIND UTC DENVER
64# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
65# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
66# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
67# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
68# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
69# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
70# USA - " - 9 H BEHIND UTC APR 3 - OCT 30
71# USA HAWAII 10 H BEHIND UTC
72# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
73
74# From Arthur David Olson (January 21, 1989):
75# The above dates are for 1988.
76# Note the "AKST" and "AKDT" abbreviations, the claim that there's
77# no DST in Samoa, and the claim that there is DST in Alaska and the
78# Aleutians.
79
80# From Arthur David Olson (February 13, 1988):
81# Legal standard time zone names, from United States Code (1982 Edition and
82# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
83# up to April 1, 1967 (when most provisions of the Uniform Time Act of 1966
84# took effect), as explained in sections 263 and 261:
85# (none)
86# United States standard eastern time
87# United States standard mountain time
88# United States standard central time
89# United States standard Pacific time
90# (none)
91# United States standard Alaska time
92# (none)
93# Next, names from April 1, 1967 until November 30, 1983 (the date for
94# public law 98-181):
95# Atlantic standard time
96# eastern standard time
97# central standard time
98# mountain standard time
99# Pacific standard time
100# Yukon standard time
101# Alaska-Hawaii standard time
102# Bering standard time
103# And after November 30, 1983:
104# Atlantic standard time
105# eastern standard time
106# central standard time
107# mountain standard time
108# Pacific standard time
109# Alaska standard time
110# Hawaii-Aleutian standard time
111# Samoa standard time
112# The law doesn't give abbreviations.
113
114# From Paul Eggert <eggert@twinsun.com> (August 16, 1994):
115# Howse writes that Alaska switched from the Julian to the Gregorian calendar,
116# and from east-of-GMT to west-of-GMT days, in 1867 when the US purchased it
117# from Russia. We don't have this data pinned down yet, though.
118
119# Easy stuff first--including Alaska, where we ignore history (since we
120# can't tell if we should give Yukon time or Alaska-Hawaii time for "old"
121# times).
122
123# Zone NAME GMTOFF RULES FORMAT [UNTIL]
124Zone America/New_York -5:00 US E%sT
125Zone America/Chicago -6:00 US C%sT
126Zone America/Denver -7:00 US M%sT
127Zone America/Los_Angeles -8:00 US P%sT
128Zone America/Anchorage -9:00 US AK%sT
129 # AK%sT is the abbreviation per USNO
130
131# Mainland US areas that are always Standard as of 1986.
132
133Zone America/Fort_Wayne -5:00 US E%sT 1946
134 -5:00 - EST # Always EST as of 1986
135# From Arthur David Olson (October 28, 1991):
136# An article on page A3 of the Sunday, October 27, 1991 Washington Post
137# notes that Starke County switched from Central time to Eastern time as of
138# October 27, 1991.
139Zone America/Knox_IN -6:00 US C%sT 1991 Oct 27 2:00
140 -5:00 - EST # Always EST as of 1991
141Zone America/Phoenix -7:00 US M%sT 1946
142 -7:00 - MST # Always MST as of 1986
143
144# From Arthur David Olson (February 13, 1988):
145# However. . .a writer from the Inter Tribal Council of Arizona, Inc.,
146# notes in private correspondence dated 12/28/87 that "Presently, only the
147# Navajo Nation participates in the Daylight Saving Time policy, due to its
148# large size and location in three states." (The "only" means that other
149# tribal nations don't use DST.)
150
151Link America/Denver Navajo
152
153# From Bob Devine (January 28, 1988):
154# Michigan didn't observe DST from 1968 to 1973.
155
156Zone America/Detroit -5:00 US E%sT 1968
157 -5:00 - EST 1973
158 -5:00 US E%sT
159
160# Samoa just changes names. No DST, per Naval Observatory.
161#
162# Howse writes that in 1879 the King of Samoa decided to change
163# ``the date in his kingdom from the Antipodean to the American system,
164# ordaining -- by a masterpiece of diplomatic flattery -- that
165# the Fourth of July should be celebrated twice in that year.''
166
167Zone Pacific/Samoa 12:37:12 - LMT 1879 Jul 5
168 -11:22:48 - LMT 1911
169 -11:30 - SST 1950
170 -11:00 - NST 1967 Apr # N=Nome
171 -11:00 - BST 1983 Nov 30 # B=Bering
172 -11:00 - SST # S=Samoa
173
174Zone Pacific/Midway -11:49:28 - LMT 1901
175 -11:00 - NST 1967 Apr # N=Nome
176 -11:00 - BST 1983 Nov 30 # B=Bering
177 -11:00 - SST # S=Samoa
178
179# Aleutian has a name change. DST, per Naval Observatory.
180
181Zone America/Atka -10:00 US AH%sT 1983 Nov 30
182 -10:00 US HA%sT
183
184# From Arthur David Olson:
185# And then there's Hawaii.
186# DST was observed for one day in 1933;
187# Standard time was change by half an hour in 1947;
188# it's always standard as of 1986.
189
190Zone Pacific/Honolulu -10:30 US H%sT 1933 Apr 30 2:00
191 -10:30 1:00 HDT 1933 May 1 2:00
192 -10:30 US H%sT 1947 Jun 8 2:00
193 -10:00 - HST
194
195# Navassa
196# no information; probably like US/Eastern
197
198
199# Old names, for S5 users
200
201# Link LINK-FROM LINK-TO
202Link America/New_York EST5EDT
203Link America/Chicago CST6CDT
204Link America/Denver MST7MDT
205Link America/Los_Angeles PST8PDT
206Link America/Fort_Wayne EST
207Link America/Phoenix MST
208Link Pacific/Honolulu HST
209
210################################################################################
211
212
213# From Paul Eggert <eggert@twinsun.com> (November 18, 1993):
214# A good source for time zone historical data outside the U.S. is
215# Thomas G. Shanks, The International Atlas (3rd edition),
216# San Diego: ACS Publications, Inc. (1991).
217# Except where otherwise noted, it is the source for the data below.
218#
219# Another source occasionally used is Edward W. Whitman, World Time Differences,
220# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
221# I found in the UCLA library.
222#
223# I invented the abbreviation SPST for St Pierre Standard Time; SPDT likewise.
224# Corrections are welcome!
225#
226# See the `africa' file for Zone naming conventions.
227
228
229
230# Canada
231
232# Canada is reportedly lots easier than the US--leastways since 1951.
233# I don't know what they did before then.
234# 4.3BSD claims that it's perfectly regular.
235# According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc.
236# on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada,
237# "...Canada (well, Ontario and at least some of the other provinces) are
238# adopting the new daylight savings time rules...". We assume all of
239# Canada is doing so.
240
241# From Bob Devine (January 28, 1988):
242# All of Canada did have DST from your first rule except Saskatchewan.
243# Which parts did not observe DST is hard to pinpoint but most of the
244# province follows the rules.
245# NOTE: those that didn't have DST for that rule, also
246# probably did not have it for several years previous.
247
248# From U. S. Naval Observatory (January 19, 1989):
249# CANADA NEW FDL 3.5H BEHIND UTC ST.JOHN'S
250# CANADA NEW FDL 1.5H BEHIND UTC APR 3 - OCT 29
251# CANADA ATLANTIC 4 H BEHIND UTC HALIFAX
252# CANADA ATLANTIC 3 H BEHIND UTC APR 3 - OCT 29
253# CANADA EASTERN 5 H BEHIND UTC TORONTO, MONTREAL, OTTAWA
254# CANADA EASTERN 4 H BEHIND UTC APR 3 - OCT 29
255# CANADA CENTRAL 6 H BEHIND UTC REGINA, WINNIPEG
256# CANADA CENTRAL 5 H BEHIND UTC APR 3 - OCT 29
257# CANADA MOUNTAIN 7 H BEHIND UTC CALGARY, EDMONTON
258# CANADA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 29
259# CANADA PACIFIC 8 H BEHIND UTC VANCOUVER
260# CANADA PACIFIC 7 H BEHIND UTC APR 3 - OCT 29
261# CANADA YUKON SAME AS PACIFIC DAWSON
262
263# From Arthur David Olson (January 21, 1989):
264# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
265# Note claim that there's double DST in Newfoundland and that Yukon should
266# be same as Pacific.
267
268# From W. Jones (jones@skdad.usask.ca) (November 6, 1992):
269# The. . .below is based on information I got from our law library, the
270# provincial archives, and the provincial Community Services department.
271# A precise history would require digging through newspaper archives, and
272# since you didn't say what you wanted, I didn't bother.
273#
274# Saskatchewan is split by a time zone meridian (105W) and over the years
275# the boundary became pretty ragged as communities near it reevaluated
276# their affiliations in one direction or the other. In 1965 a provincial
277# referendum favoured legislating common time practices.
278#
279# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
280# Saskatchewan 1978) was proclaimed, and established that the eastern
281# part of Saskatchewan would use CST year round, that districts in
282# northwest Saskatchewan would by default follow CST but could opt to
283# follow Mountain Time rules (thus 1 hour difference in the winter and
284# zero in the summer), and that districts in southwest Saskatchewan would
285# by default follow MT but could opt to follow CST.
286#
287# It took a few years for the dust to settle (I know one story of a town
288# on one time zone having its school in another, such that a mom had to
289# serve her family lunch in two shifts), but presently it seems that only
290# a few towns on the border with Alberta (e.g. Lloydminster) follow MT
291# rules any more; all other districts appear to have used CST year round
292# since sometime in the 1960s.
293#
294# Here's how I would summarize things. Establish a "Saskatchewan" CST
295# time zone, and note that it officially exists as of 15 April 1966. Any
296# current exceptions can put themselves in the "Mountain" zone, since
297# those are the rules they follow. Any past exceptions can be forgotten,
298# since that's what those who live here have done.
299
300# From Arthur David Olson (November 21, 1992):
301# East-Saskatchewan kept to avoid problems for folks using that zone by name;
302# plain Saskatchewan added.
303
304
305# From Shanks (1991):
306# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
307Rule StJohns 1884 only - Jan 1 0:00 0 S
308Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D
309Rule StJohns 1917 only - Sep 17 2:00 0 S
310Rule StJohns 1918 only - Oct 31 2:00 0 S
311# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks.
312Rule StJohns 1919 only - May 5 23:00 1:00 D
313Rule StJohns 1919 only - Aug 12 23:00 0 S
314# For 1931-1935 Whitman gives Apr same date; go with Shanks.
315Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
316Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
317# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman.
318Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D
319Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S
320# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman.
321Rule StJohns 1942 only - Mar 1 0:00 1:00 D
322Rule StJohns 1942 only - Dec 31 0:00 0 S
323Rule StJohns 1943 only - May 30 0:00 1:00 D
324Rule StJohns 1943 only - Sep 5 0:00 0 S
325Rule StJohns 1944 only - Jul 10 0:00 1:00 D
326Rule StJohns 1944 only - Sep 2 0:00 0 S
327Rule StJohns 1945 only - Jan 1 0:00 1:00 D
328Rule StJohns 1945 only - Oct 7 2:00 0 S
329# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
330# Apr 30 - Sep 24; go with Shanks.
331Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
332Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
333Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
334Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
335Rule StJohns 1960 max - Oct lastSun 2:00 0 S
336Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D
337Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 D
338Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D
339# St John's has an apostrophe, but Posix file names can't have apostrophes.
340# Zone NAME GMTOFF RULES FORMAT [UNTIL]
341Zone America/St_Johns -3:30:52 - LMT 1884
342 -3:31 StJohns N%sT 1935 Mar 30
343 -3:30 StJohns N%sT
344
345# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
346Rule Halifax 1902 only - Jun 15 0:00 0 S
347Rule Halifax 1916 only - Apr 1 0:00 1:00 D
348Rule Halifax 1916 only - Oct 1 0:00 0 S
349Rule Halifax 1918 only - Apr 14 2:00 1:00 D
350Rule Halifax 1918 only - Oct 31 2:00 0 S
351Rule Halifax 1920 only - May 9 0:00 1:00 D
352Rule Halifax 1920 only - Aug 29 0:00 0 S
353Rule Halifax 1921 only - May 6 0:00 1:00 D
354Rule Halifax 1921 1922 - Sep 5 0:00 0 S
355Rule Halifax 1922 only - Apr 30 0:00 1:00 D
356Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
357Rule Halifax 1923 only - Sep 4 0:00 0 S
358Rule Halifax 1924 only - Sep 15 0:00 0 S
359Rule Halifax 1925 only - Sep 28 0:00 0 S
360Rule Halifax 1926 only - May 16 0:00 1:00 D
361Rule Halifax 1926 only - Sep 13 0:00 0 S
362Rule Halifax 1927 only - May 1 0:00 1:00 D
363Rule Halifax 1927 only - Sep 26 0:00 0 S
364Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
365Rule Halifax 1928 only - Sep 9 0:00 0 S
366Rule Halifax 1929 only - Sep 3 0:00 0 S
367Rule Halifax 1930 only - Sep 15 0:00 0 S
368Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
369Rule Halifax 1933 only - Apr 30 0:00 1:00 D
370Rule Halifax 1933 only - Oct 2 0:00 0 S
371Rule Halifax 1934 only - May 20 0:00 1:00 D
372Rule Halifax 1934 only - Sep 16 0:00 0 S
373Rule Halifax 1935 only - Jun 2 0:00 1:00 D
374Rule Halifax 1935 only - Sep 30 0:00 0 S
375Rule Halifax 1936 only - Jun 1 0:00 1:00 D
376Rule Halifax 1936 only - Sep 14 0:00 0 S
377Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
378Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
379Rule Halifax 1939 only - May 28 0:00 1:00 D
380Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
381Rule Halifax 1942 only - Feb 9 2:00 1:00 D
382Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S
383Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D
384Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D
385Rule Halifax 1962 max - Oct lastSun 2:00 0 S
386Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D
387# Zone NAME GMTOFF RULES FORMAT [UNTIL]
388Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
389 -4:00 Halifax A%sT
390
391# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
392Rule Mont 1884 only - Jan 1 0:00 0 S
393Rule Mont 1917 only - Mar 25 2:00 1:00 D
394Rule Mont 1917 only - Apr 24 0:00 0 S
395Rule Mont 1918 only - Apr 14 2:00 1:00 D
396Rule Mont 1918 only - Oct 31 2:00 0 S
397Rule Mont 1919 only - Mar 31 2:30 1:00 D
398Rule Mont 1919 only - Oct 25 2:30 0 S
399Rule Mont 1920 only - May 2 2:30 1:00 D
400Rule Mont 1920 only - Oct 3 2:30 0 S
401Rule Mont 1921 only - May 1 2:00 1:00 D
402Rule Mont 1921 only - Oct 2 2:30 0 S
403Rule Mont 1922 only - Apr 30 2:00 1:00 D
404Rule Mont 1922 only - Oct 1 2:30 0 S
405Rule Mont 1924 only - May 17 2:00 1:00 D
406Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
407Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
408Rule Mont 1927 only - May 1 0:00 1:00 D
409Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S
410Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D
411Rule Mont 1932 only - May 1 0:00 1:00 D
412Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D
413Rule Mont 1933 only - Oct 1 0:00 0 S
414Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S
415Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
416Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D
417Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
418Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
419Rule Mont 1957 max - Oct lastSun 2:00 0 S
420Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D
421# Zone NAME GMTOFF RULES FORMAT [UNTIL]
422Zone America/Montreal -4:54:16 - LMT 1884
423 -5:00 Mont E%sT
424
425# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
426Rule Winn 1887 only - Jul 16 0:00 0 S
427Rule Winn 1916 only - Apr 23 0:00 1:00 D
428Rule Winn 1916 only - Sep 17 0:00 0 S
429Rule Winn 1918 only - Apr 14 2:00 1:00 D
430Rule Winn 1918 only - Oct 31 2:00 0 S
431Rule Winn 1937 only - May 16 2:00 1:00 D
432Rule Winn 1937 only - Sep 23 2:00 0 S
433Rule Winn 1942 only - Feb 9 2:00 1:00 D
434Rule Winn 1945 only - Sep lastSun 2:00 0 S
435Rule Winn 1946 only - May 12 2:00 1:00 D
436Rule Winn 1946 only - Oct 13 2:00 0 S
437Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
438Rule Winn 1947 1958 - Sep lastSun 2:00 0 S
439Rule Winn 1948 only - May 1 2:00 1:00 D
440Rule Winn 1948 1960 - Apr lastSun 2:00 1:00 D
441Rule Winn 1959 only - Oct lastSun 2:00 0 S
442Rule Winn 1960 only - Sep lastSun 2:00 0 S
443Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
444Rule Winn 1963 only - Sep lastSun 2:00 0 S
445Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D
446Rule Winn 1966 max - Sep lastSun 2:00 0 S
447Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D
448# Zone NAME GMTOFF RULES FORMAT [UNTIL]
449Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
450 -6:00 Winn C%sT
451
452# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
453Rule Regina 1905 only - Sep 1 0:00 0 S
454Rule Regina 1918 only - Apr 14 2:00 1:00 D
455Rule Regina 1918 only - Oct 31 2:00 0 S
456Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
457Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
458Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
459Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
460Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
461Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
462Rule Regina 1942 only - Feb 9 2:00 1:00 D
463Rule Regina 1945 only - Sep lastSun 2:00 0 S
464Rule Regina 1946 only - Apr 14 2:00 1:00 D
465Rule Regina 1946 only - Oct 13 2:00 0 S
466Rule Regina 1947 1960 - Apr lastSun 2:00 1:00 D
467Rule Regina 1947 1959 - Sep lastSun 2:00 0 S
468# Zone NAME GMTOFF RULES FORMAT [UNTIL]
469Zone America/Regina -6:58:36 - LMT 1905 Sep
470 -7:00 Regina M%sT 1966 Apr 15
471 -6:00 - CST
472
473# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
474Rule Edm 1906 only - Sep 1 0:00 0 S
475Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
476Rule Edm 1918 only - Oct 31 2:00 0 S
477Rule Edm 1919 only - May 27 2:00 0 S
478Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
479Rule Edm 1920 only - Oct lastSun 2:00 0 S
480Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
481Rule Edm 1942 only - Feb 9 2:00 1:00 D
482Rule Edm 1945 only - Sep lastSun 2:00 0 S
483Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
484Rule Edm 1947 only - Sep lastSun 2:00 0 S
485Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
486Rule Edm 1967 only - Oct lastSun 2:00 0 S
487Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
488Rule Edm 1969 only - Oct lastSun 2:00 0 S
489Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
490Rule Edm 1972 max - Oct lastSun 2:00 0 S
491Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D
492# Zone NAME GMTOFF RULES FORMAT [UNTIL]
493Zone America/Edmonton -7:33:52 - LMT 1906 Sep
494 -7:00 Edm M%sT
495
496# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
497Rule Vanc 1884 only - Jan 1 0:00 0 S
498Rule Vanc 1918 only - Apr 14 2:00 1:00 D
499Rule Vanc 1918 only - Oct 31 2:00 0 S
500Rule Vanc 1942 only - Feb 9 2:00 1:00 D
501Rule Vanc 1945 only - Sep 30 2:00 0 S
502Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
503Rule Vanc 1946 only - Oct 13 2:00 0 S
504Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
505Rule Vanc 1962 max - Oct lastSun 2:00 0 S
506Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D
507# Zone NAME GMTOFF RULES FORMAT [UNTIL]
508Zone America/Vancouver -8:12:28 - LMT 1884
509 -8:00 Vanc P%sT
510
511# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
512Rule Yukon 1900 only - Jan 1 0:00 0 S
513Rule Yukon 1918 only - Apr 14 2:00 1:00 D
514Rule Yukon 1918 only - Oct 27 2:00 0 S
515Rule Yukon 1919 only - May 25 2:00 1:00 D
516Rule Yukon 1919 only - Nov 1 0:00 0 S
517Rule Yukon 1942 only - Feb 9 2:00 1:00 D
518Rule Yukon 1965 only - Apr 25 0:00 1:00 D
519Rule Yukon 1965 only - Oct 31 2:00 0 S
520Rule Yukon 1980 1986 - Apr lastSun 2:00 1:00 D
521Rule Yukon 1980 max - Oct lastSun 2:00 0 S
522Rule Yukon 1987 max - Apr Sun>=1 2:00 1:00 D
523# Zone NAME GMTOFF RULES FORMAT [UNTIL]
524Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
525 -9:00 Yukon Y%sT 1966 Jul
526 -8:00 Yukon P%sT
527# Parts of Yukon (e.g. Dawson) didn't switch to -8:00 until 1973 Oct 28.
528
529###############################################################################
530
531# Mexico
532
533# From Guy Harris:
534# Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
535# Rules prior to 1987 are unknown.
536# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
537# observe DST." This is presumably Baja California Norte, above 28th parallel,
538# as listed there; Mexico/BajaSur is for "Baja California Sur and N. Pacific
539# Coast (States of Sinaloa and Sonora)."
540
541# From Bob Devine (January 28, 1988):
542# The Federal District (where Mexico City is) has observed [DST] several
543# times but not recently.
544#
545# I don't where to drawn the line in the North Baja area. 28th latitude
546# sounds good -- but it may be higher (how far [d]o radio stations from
547# San Diego affect culture?).
548#
549# The dates of DST probably go back to 1981. The rules are the same as
550# US's. This is going to be a headache for US presidential electi[o]n years!
551
552# From Arthur David Olson (February 13, 1988)
553# Since the 1981 starting date is only "probable," we'll keep the 1987
554# starting date below.
555
556# From U. S. Naval Observatory (January 19, 1989):
557# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
558# MEXICO BAJA CAL N N. PACIFIC COAST (STATES
559# MEXICO BAJA CAL N OF SINALOA AND SONORA)
560# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLAL APR 3
561# MEXICO BAJA CAL N - OCT 29
562# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL APR 3
563# MEXICO BAJA CAL N - 0CT 29
564# MEXICO 6 H BEHIND UTC STATES OF DURANGO,
565# MEXICO COAHUILA, NUEVO LEON,
566# MEXICO TAMAULIPAS
567# MEXICO 5 H BEHIND UTC STATES OF DURANGO,
568# MEXICO COAHUILA, NUEVO LEON,
569# MEXICO TAMAULIPAS APR 3 - OCT 29
570# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
571# MEXICO CAMPECHE, QUINTANA ROO AND
572# MEXICO YUCATAN
573
574# From Arthur David Olson (January 21, 1989):
575# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
576# USNO claims there should be four Mexican zones rather than three:
577# a zone that's GMT-8 with DST; a zone that's always GMT-7;
578# a zone that's GMT-6 with DST; and a zone that's always GMT-6.
579
580# From Paul Eggert <eggert@twinsun.com> (November 18, 1993):
581# Shanks also says there are four zones, but disagrees about the fourth.
582# Instead of GMT-6 with DST, he says there's GMT-8 without DST.
583
584# From Shanks (1991):
585# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
586Rule Mexico 1922 only - Jan 1 0:00 0 S
587Rule Mexico 1939 only - Feb 5 0:00 1:00 D
588Rule Mexico 1939 only - Jun 25 0:00 0 S
589Rule Mexico 1940 only - Dec 9 0:00 1:00 D
590Rule Mexico 1941 only - Apr 1 0:00 0 S
591Rule Mexico 1943 only - Dec 16 0:00 1:00 D
592Rule Mexico 1944 only - May 1 0:00 0 S
593Rule Mexico 1950 only - Feb 12 0:00 1:00 D
594Rule Mexico 1950 only - Jul 30 0:00 0 S
595Rule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D
596Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S
597Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S
598# Zone NAME GMTOFF RULES FORMAT [UNTIL]
599Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
600 -7:00 - MST 1927 Jun 10 23:00
601 -6:00 - CST 1930 Nov 15
602 -7:00 - MST 1931 May 1 23:00
603 -6:00 - CST 1931 Oct
604 -7:00 - MST 1932 Mar 30 23:00
605 -6:00 Mexico C%sT
606Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
607 -7:00 - MST 1927 Jun 10 23:00
608 -6:00 - CST 1930 Nov 15
609 -7:00 - MST 1931 May 1 23:00
610 -6:00 - CST 1931 Oct
611 -7:00 - MST 1932 Mar 30 23:00
612 -6:00 - CST 1942 Apr
613 -7:00 - MST 1949 Jan 14
614 -8:00 - PST 1970
615 -7:00 - MST
616Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
617 -8:00 - PST 1927 Jun 10 23:00
618 -7:00 - MST 1930 Nov 16
619 -8:00 - PST 1942 Apr
620 -7:00 - MST 1949 Jan 14
621 -8:00 BajaN P%sT 1967 Apr lastSun 2:00
622 -8:00 US P%sT
623Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32
624 -8:00 - PST 1927 Jun 10 23:00
625 -7:00 - MST 1930 Nov 16
626 -8:00 - PST 1942 Apr
627 -7:00 - MST 1949 Jan 14
628 -8:00 - PST
629#
630# Revillagigedo Is
631# no information
632
633###############################################################################
634
635# Anguilla
636# Zone NAME GMTOFF RULES FORMAT [UNTIL]
637Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
638 -4:00 - AST
639
640# Antigua and Barbuda
641# Zone NAME GMTOFF RULES FORMAT [UNTIL]
642Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
643 -5:00 - EST 1951
644 -4:00 - AST
645
646# Bahamas
647# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
648Rule Bahamas 1912 only - Mar 2 0:00 0 S
649Rule Bahamas 1964 max - Oct lastSun 2:00 0 S
650Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D
651Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D
652# Zone NAME GMTOFF RULES FORMAT [UNTIL]
653Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
654 -5:00 Bahamas E%sT
655
656# Barbados
657# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
658Rule Barb 1932 only - Jan 1 0:00 0 S
659Rule Barb 1977 only - Jun 12 2:00 1:00 D
660Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
661Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
662Rule Barb 1979 only - Sep 30 2:00 0 S
663Rule Barb 1980 only - Sep 25 2:00 0 S
664# Zone NAME GMTOFF RULES FORMAT [UNTIL]
665Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
666 -3:58 - BMT 1932 # Bridgetown Mean Time
667 -4:00 Barb A%sT
668
669# Belize
670# Whitman entirely disagrees with Shanks; go with Shanks.
671# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
672Rule Belize 1912 only - Apr 1 0:00 0 S
673Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
674Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
675Rule Belize 1973 only - Dec 5 0:00 1:00 D
676Rule Belize 1974 only - Feb 9 0:00 0 S
677Rule Belize 1982 only - Dec 18 0:00 1:00 D
678Rule Belize 1983 only - Feb 12 0:00 0 S
679# Zone NAME GMTOFF RULES FORMAT [UNTIL]
680Zone America/Belize -5:52:48 - LMT 1912 Apr
681 -6:00 Belize C%sT
682
683# Bermuda
684# Zone NAME GMTOFF RULES FORMAT [UNTIL]
685Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
686 -4:00 - AST 1974 Apr 28 2:00
687 -4:00 Bahamas A%sT
688
689# Cayman Is
690# Zone NAME GMTOFF RULES FORMAT [UNTIL]
691Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
692 -5:07 - KMT 1912 Feb # Kingston Mean Time
693 -5:00 - EST
694
695# Clipperton
696# no information
697
698# Costa Rica
699# Shanks gives some very odd dates for 1991, and stops there.
700# For now, we won't guess further.
701# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
702Rule CR 1921 only - Jan 15 0:00 0 S
703Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
704Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
705Rule CR 1991 only - Jan 19 0:00 1:00 D
706Rule CR 1991 only - Jul 1 0:00 0 S
707# There are too many San Joses elsewhere, so we'll use `Costa Rica'.
708# Zone NAME GMTOFF RULES FORMAT [UNTIL]
709Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
710 -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time
711 -6:00 CR C%sT
712# Coco
713# no information; probably like America/Costa_Rica
714
715# Cuba
716
717# From Bob Devine (January 28, 1988):
718# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981.
719# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March
720# (I think).
721
722# From U. S. Naval Observatory (January 19, 1989):
723# CUBA 5 H BEHIND UTC
724# CUBA 4 H BEHIND UTC MAR 20 - OCT 8
725
726# From Shanks (1991):
727# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
728Rule Cuba 1925 only - Jul 19 12:00 0 S
729Rule Cuba 1928 only - Jun 10 0:00 1:00 D
730Rule Cuba 1928 only - Oct 10 0:00 0 S
731Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
732Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
733Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
734Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
735Rule Cuba 1965 only - Jun 1 0:00 1:00 D
736Rule Cuba 1965 only - Sep 30 0:00 0 S
737Rule Cuba 1966 only - May 29 0:00 1:00 D
738Rule Cuba 1966 only - Oct 2 0:00 0 S
739Rule Cuba 1967 only - Apr 8 0:00 1:00 D
740Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
741Rule Cuba 1968 only - Apr 14 0:00 1:00 D
742Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
743Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
744Rule Cuba 1972 1974 - Oct 8 0:00 0 S
745Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
746Rule Cuba 1978 only - May 7 0:00 1:00 D
747Rule Cuba 1978 1980 - Oct Sun>=8 0:00 0 S
748Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
749Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
750Rule Cuba 1981 max - Oct Sun>=8 0:00 0 S
751Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
752Rule Cuba 1990 only - Apr 1 0:00 1:00 D
753Rule Cuba 1991 max - Mar Sun>=14 0:00 1:00 D
754
755# Zone NAME GMTOFF RULES FORMAT [UNTIL]
756Zone America/Havana -5:29:28 - LMT 1890
757 -5:30 - HMT 1925 Jul 19 12:00 # Havana MT
758 -5:00 Cuba C%sT
759
760# Dominica
761# Zone NAME GMTOFF RULES FORMAT [UNTIL]
762Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
763 -4:00 - AST
764
765# Dominican Republic
766# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
767Rule DR 1933 only - Apr 1 12:00 0 S
768Rule DR 1966 only - Oct 30 0:00 1:00 D
769Rule DR 1967 only - Feb 28 0:00 0 S
770Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
771Rule DR 1970 only - Feb 21 0:00 0 S
772Rule DR 1971 only - Jan 20 0:00 0 S
773Rule DR 1972 1974 - Jan 21 0:00 0 S
774# Zone NAME GMTOFF RULES FORMAT [UNTIL]
775Zone America/Santo_Domingo -4:39:36 - LMT 1890
776 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
777 -5:00 DR E%sT 1974 Oct 27
778 -4:00 - AST
779
780# El Salvador
781# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
782Rule Salv 1921 only - Jan 1 0:00 0 S
783Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
784Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
785# There are too many San Salvadors elsewhere, so we'll use `El Salvador'.
786# Zone NAME GMTOFF RULES FORMAT [UNTIL]
787Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
788 -6:00 Salv C%sT
789
790# Grenada
791# Zone NAME GMTOFF RULES FORMAT [UNTIL]
792Zone America/Grenada -4:07:00 - LMT 1911 Jul
793 -4:00 - AST
794
795# Guadeloupe
796# Zone NAME GMTOFF RULES FORMAT [UNTIL]
797Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
798 -4:00 - AST
799
800# Guatemala
801# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
802Rule Guat 1918 only - Oct 5 0:00 0 S
803Rule Guat 1973 only - Nov 25 0:00 1:00 D
804Rule Guat 1974 only - Feb 24 0:00 0 S
805Rule Guat 1983 only - May 21 0:00 1:00 D
806Rule Guat 1983 only - Sep 22 0:00 0 S
807# Zone NAME GMTOFF RULES FORMAT [UNTIL]
808Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
809 -6:00 Guat C%sT
810
811# Haiti
812# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
813Rule Haiti 1917 only - Jan 24 12:00 0 S
814Rule Haiti 1983 only - May 8 0:00 1:00 D
815Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
816Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
817Rule Haiti 1988 max - Apr Sun>=1 2:00 1:00 D
818Rule Haiti 1988 max - Oct lastSun 2:00 0 S
819# Zone NAME GMTOFF RULES FORMAT [UNTIL]
820Zone America/Port-au-Prince -4:49:20 - LMT 1890
821 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
822 -5:00 Haiti E%sT
823
824# Honduras
825# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1.
826# Zone NAME GMTOFF RULES FORMAT [UNTIL]
827Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
828 -6:00 Salv C%sT
829
830# Jamaica
831
832# From Bob Devine (January 28, 1988):
833# Follows US rules.
834
835# From U. S. Naval Observatory (January 19, 1989):
836# JAMAICA 5 H BEHIND UTC
837
838# From Shanks (1991):
839# Zone NAME GMTOFF RULES FORMAT [UNTIL]
840Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
841 -5:07 - KMT 1912 Feb # Kingston Mean Time
842 -5:00 - EST 1974 Jan 6 2:00
843 -5:00 US E%sT
844
845# Martinique
846# Zone NAME GMTOFF RULES FORMAT [UNTIL]
847Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
848 -4:04 - FFMT 1911 May # Fort-de-France MT
849 -4:00 - AST 1980 Apr 6
850 -4:00 1:00 ADT 1980 Sep 28
851 -4:00 - AST
852
853# Montserrat
854# Zone NAME GMTOFF RULES FORMAT [UNTIL]
855Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Plymouth
856 -4:00 - AST
857
858# Nicaragua
859# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
860Rule Nic 1975 only - Feb 16 0:00 0 S
861Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
862Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
863# Zone NAME GMTOFF RULES FORMAT [UNTIL]
864Zone America/Managua -5:45:08 - LMT 1890
865 -5:45 - MMT 1934 Jun 23 # Managua Mean Time
866 -6:00 - CST 1973 May
867 -5:00 - EST 1975 Feb 16
868 -6:00 Nic C%sT
869
870# Panama
871# Zone NAME GMTOFF RULES FORMAT [UNTIL]
872Zone America/Panama -5:18:08 - LMT 1890
873 -5:20 - PMT 1908 Apr 22 # Panama Mean Time
874 -5:00 - EST
875
876# Puerto Rico
877# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
878# Zone NAME GMTOFF RULES FORMAT [UNTIL]
879Zone America/Puerto_Rico -4:24:28 - LMT 1899 Mar 28 12:00 # San Juan
880 -4:00 - AST 1942 May 3
881 -4:00 1:00 ADT 1945 Sep 30 2:00
882 -4:00 - AST
883
884# St Kitts-Nevis
885# Zone NAME GMTOFF RULES FORMAT [UNTIL]
886Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
887 -4:00 - AST
888
889# St Lucia
890# Zone NAME GMTOFF RULES FORMAT [UNTIL]
891Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
892 -4:04 - CMT 1912 # Castries Mean Time
893 -4:00 - AST
894
895# St Pierre and Miquelon
896# There are too many St Pierres elsewhere, so we'll use `Miquelon'.
897# Zone NAME GMTOFF RULES FORMAT [UNTIL]
898Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
899 -4:00 - AST 1980 May
900 -3:00 Mont SP%sT
901
902# St Vincent and the Grenadines
903# Zone NAME GMTOFF RULES FORMAT [UNTIL]
904Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
905 -4:05 - KMT 1912 # Kingstown Mean Time
906 -4:00 - AST
907
908# Turks and Caicos
909# Zone NAME GMTOFF RULES FORMAT [UNTIL]
910Zone America/Grand_Turk -4:44:32 - LMT 1890
911 -5:07 - KMT 1912 Feb # Kingston Mean Time
912 -5:00 - EST 1979 Apr 29 2:00
913 -5:00 US E%sT
914
915# Virgin Is (British and US)
916# Zone NAME GMTOFF RULES FORMAT [UNTIL]
917Zone America/Virgin -4:19:44 - LMT 1911 Jul # Charlotte Amalie
918 -4:00 - AST
2# also includes Central America and the Caribbean
3
4# This data is by no means authoritative; if you think you know better,
5# go ahead and edit the file (and please send any changes to
6# tz@elsie.nci.nih.gov for general use in the future).
7
8# From Paul Eggert <eggert@twinsun.com> (August 17, 1994):
9# A reliable and entertaining source about time zones is
10# Derek Howse, Greenwich time and the discovery of the longitude,
11# Oxford University Press (1980).
12
13###############################################################################
14
15# United States
16
17# From Arthur David Olson:
18# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
19# See, for example, the front page of the Saturday, October 26, 1974
20# and Sunday, October 27, 1974 editions of the Washington Post.
21
22# From seismo!munnari!kre:
23# I recall also being told by someone once that Canada didn't have
24# the DST variations in 74/75 that the US did, but I am not nearly
25# sure enough of this to add anything.
26
27# From Arthur David Olson:
28# The above has been confirmed by Bob Devine; we'll go with it here.
29
30# From Arthur David Olson:
31# Before the Uniform Time Act of 1966 took effect in 1967, observance of
32# Daylight Saving Time in the US was by local option, except during wartime.
33
34# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
35Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
36Rule US 1918 1919 - Oct lastSun 2:00 0 S
37Rule US 1942 only - Feb 9 2:00 1:00 W # War
38Rule US 1945 only - Sep 30 2:00 0 S
39Rule US 1967 max - Oct lastSun 2:00 0 S
40Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
41Rule US 1974 only - Jan 6 2:00 1:00 D
42Rule US 1975 only - Feb 23 2:00 1:00 D
43Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
44Rule US 1987 max - Apr Sun>=1 2:00 1:00 D
45
46# From Bob Devine (January 28, 1988):
47# ...Alaska (and Hawaii) had the timezone names changed in 1967.
48# old new
49# Pacific Standard Time(PST) -same-
50# Yukon Standard Time(YST) -same-
51# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
52# Nome Standard Time (NT) Bering Standard Time (BST)
53#
54# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
55# The YST zone now covers nearly all of the state, AHST just part
56# of the Aleutian islands. No DST.
57
58# From U. S. Naval Observatory (January 19, 1989):
59# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
60# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
61# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
62# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
63# USA MOUNTAIN 7 H BEHIND UTC DENVER
64# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
65# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
66# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
67# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
68# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
69# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
70# USA - " - 9 H BEHIND UTC APR 3 - OCT 30
71# USA HAWAII 10 H BEHIND UTC
72# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
73
74# From Arthur David Olson (January 21, 1989):
75# The above dates are for 1988.
76# Note the "AKST" and "AKDT" abbreviations, the claim that there's
77# no DST in Samoa, and the claim that there is DST in Alaska and the
78# Aleutians.
79
80# From Arthur David Olson (February 13, 1988):
81# Legal standard time zone names, from United States Code (1982 Edition and
82# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
83# up to April 1, 1967 (when most provisions of the Uniform Time Act of 1966
84# took effect), as explained in sections 263 and 261:
85# (none)
86# United States standard eastern time
87# United States standard mountain time
88# United States standard central time
89# United States standard Pacific time
90# (none)
91# United States standard Alaska time
92# (none)
93# Next, names from April 1, 1967 until November 30, 1983 (the date for
94# public law 98-181):
95# Atlantic standard time
96# eastern standard time
97# central standard time
98# mountain standard time
99# Pacific standard time
100# Yukon standard time
101# Alaska-Hawaii standard time
102# Bering standard time
103# And after November 30, 1983:
104# Atlantic standard time
105# eastern standard time
106# central standard time
107# mountain standard time
108# Pacific standard time
109# Alaska standard time
110# Hawaii-Aleutian standard time
111# Samoa standard time
112# The law doesn't give abbreviations.
113
114# From Paul Eggert <eggert@twinsun.com> (August 16, 1994):
115# Howse writes that Alaska switched from the Julian to the Gregorian calendar,
116# and from east-of-GMT to west-of-GMT days, in 1867 when the US purchased it
117# from Russia. We don't have this data pinned down yet, though.
118
119# Easy stuff first--including Alaska, where we ignore history (since we
120# can't tell if we should give Yukon time or Alaska-Hawaii time for "old"
121# times).
122
123# Zone NAME GMTOFF RULES FORMAT [UNTIL]
124Zone America/New_York -5:00 US E%sT
125Zone America/Chicago -6:00 US C%sT
126Zone America/Denver -7:00 US M%sT
127Zone America/Los_Angeles -8:00 US P%sT
128Zone America/Anchorage -9:00 US AK%sT
129 # AK%sT is the abbreviation per USNO
130
131# Mainland US areas that are always Standard as of 1986.
132
133Zone America/Fort_Wayne -5:00 US E%sT 1946
134 -5:00 - EST # Always EST as of 1986
135# From Arthur David Olson (October 28, 1991):
136# An article on page A3 of the Sunday, October 27, 1991 Washington Post
137# notes that Starke County switched from Central time to Eastern time as of
138# October 27, 1991.
139Zone America/Knox_IN -6:00 US C%sT 1991 Oct 27 2:00
140 -5:00 - EST # Always EST as of 1991
141Zone America/Phoenix -7:00 US M%sT 1946
142 -7:00 - MST # Always MST as of 1986
143
144# From Arthur David Olson (February 13, 1988):
145# However. . .a writer from the Inter Tribal Council of Arizona, Inc.,
146# notes in private correspondence dated 12/28/87 that "Presently, only the
147# Navajo Nation participates in the Daylight Saving Time policy, due to its
148# large size and location in three states." (The "only" means that other
149# tribal nations don't use DST.)
150
151Link America/Denver Navajo
152
153# From Bob Devine (January 28, 1988):
154# Michigan didn't observe DST from 1968 to 1973.
155
156Zone America/Detroit -5:00 US E%sT 1968
157 -5:00 - EST 1973
158 -5:00 US E%sT
159
160# Samoa just changes names. No DST, per Naval Observatory.
161#
162# Howse writes that in 1879 the King of Samoa decided to change
163# ``the date in his kingdom from the Antipodean to the American system,
164# ordaining -- by a masterpiece of diplomatic flattery -- that
165# the Fourth of July should be celebrated twice in that year.''
166
167Zone Pacific/Samoa 12:37:12 - LMT 1879 Jul 5
168 -11:22:48 - LMT 1911
169 -11:30 - SST 1950
170 -11:00 - NST 1967 Apr # N=Nome
171 -11:00 - BST 1983 Nov 30 # B=Bering
172 -11:00 - SST # S=Samoa
173
174Zone Pacific/Midway -11:49:28 - LMT 1901
175 -11:00 - NST 1967 Apr # N=Nome
176 -11:00 - BST 1983 Nov 30 # B=Bering
177 -11:00 - SST # S=Samoa
178
179# Aleutian has a name change. DST, per Naval Observatory.
180
181Zone America/Atka -10:00 US AH%sT 1983 Nov 30
182 -10:00 US HA%sT
183
184# From Arthur David Olson:
185# And then there's Hawaii.
186# DST was observed for one day in 1933;
187# Standard time was change by half an hour in 1947;
188# it's always standard as of 1986.
189
190Zone Pacific/Honolulu -10:30 US H%sT 1933 Apr 30 2:00
191 -10:30 1:00 HDT 1933 May 1 2:00
192 -10:30 US H%sT 1947 Jun 8 2:00
193 -10:00 - HST
194
195# Navassa
196# no information; probably like US/Eastern
197
198
199# Old names, for S5 users
200
201# Link LINK-FROM LINK-TO
202Link America/New_York EST5EDT
203Link America/Chicago CST6CDT
204Link America/Denver MST7MDT
205Link America/Los_Angeles PST8PDT
206Link America/Fort_Wayne EST
207Link America/Phoenix MST
208Link Pacific/Honolulu HST
209
210################################################################################
211
212
213# From Paul Eggert <eggert@twinsun.com> (November 18, 1993):
214# A good source for time zone historical data outside the U.S. is
215# Thomas G. Shanks, The International Atlas (3rd edition),
216# San Diego: ACS Publications, Inc. (1991).
217# Except where otherwise noted, it is the source for the data below.
218#
219# Another source occasionally used is Edward W. Whitman, World Time Differences,
220# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
221# I found in the UCLA library.
222#
223# I invented the abbreviation SPST for St Pierre Standard Time; SPDT likewise.
224# Corrections are welcome!
225#
226# See the `africa' file for Zone naming conventions.
227
228
229
230# Canada
231
232# Canada is reportedly lots easier than the US--leastways since 1951.
233# I don't know what they did before then.
234# 4.3BSD claims that it's perfectly regular.
235# According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc.
236# on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada,
237# "...Canada (well, Ontario and at least some of the other provinces) are
238# adopting the new daylight savings time rules...". We assume all of
239# Canada is doing so.
240
241# From Bob Devine (January 28, 1988):
242# All of Canada did have DST from your first rule except Saskatchewan.
243# Which parts did not observe DST is hard to pinpoint but most of the
244# province follows the rules.
245# NOTE: those that didn't have DST for that rule, also
246# probably did not have it for several years previous.
247
248# From U. S. Naval Observatory (January 19, 1989):
249# CANADA NEW FDL 3.5H BEHIND UTC ST.JOHN'S
250# CANADA NEW FDL 1.5H BEHIND UTC APR 3 - OCT 29
251# CANADA ATLANTIC 4 H BEHIND UTC HALIFAX
252# CANADA ATLANTIC 3 H BEHIND UTC APR 3 - OCT 29
253# CANADA EASTERN 5 H BEHIND UTC TORONTO, MONTREAL, OTTAWA
254# CANADA EASTERN 4 H BEHIND UTC APR 3 - OCT 29
255# CANADA CENTRAL 6 H BEHIND UTC REGINA, WINNIPEG
256# CANADA CENTRAL 5 H BEHIND UTC APR 3 - OCT 29
257# CANADA MOUNTAIN 7 H BEHIND UTC CALGARY, EDMONTON
258# CANADA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 29
259# CANADA PACIFIC 8 H BEHIND UTC VANCOUVER
260# CANADA PACIFIC 7 H BEHIND UTC APR 3 - OCT 29
261# CANADA YUKON SAME AS PACIFIC DAWSON
262
263# From Arthur David Olson (January 21, 1989):
264# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
265# Note claim that there's double DST in Newfoundland and that Yukon should
266# be same as Pacific.
267
268# From W. Jones (jones@skdad.usask.ca) (November 6, 1992):
269# The. . .below is based on information I got from our law library, the
270# provincial archives, and the provincial Community Services department.
271# A precise history would require digging through newspaper archives, and
272# since you didn't say what you wanted, I didn't bother.
273#
274# Saskatchewan is split by a time zone meridian (105W) and over the years
275# the boundary became pretty ragged as communities near it reevaluated
276# their affiliations in one direction or the other. In 1965 a provincial
277# referendum favoured legislating common time practices.
278#
279# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
280# Saskatchewan 1978) was proclaimed, and established that the eastern
281# part of Saskatchewan would use CST year round, that districts in
282# northwest Saskatchewan would by default follow CST but could opt to
283# follow Mountain Time rules (thus 1 hour difference in the winter and
284# zero in the summer), and that districts in southwest Saskatchewan would
285# by default follow MT but could opt to follow CST.
286#
287# It took a few years for the dust to settle (I know one story of a town
288# on one time zone having its school in another, such that a mom had to
289# serve her family lunch in two shifts), but presently it seems that only
290# a few towns on the border with Alberta (e.g. Lloydminster) follow MT
291# rules any more; all other districts appear to have used CST year round
292# since sometime in the 1960s.
293#
294# Here's how I would summarize things. Establish a "Saskatchewan" CST
295# time zone, and note that it officially exists as of 15 April 1966. Any
296# current exceptions can put themselves in the "Mountain" zone, since
297# those are the rules they follow. Any past exceptions can be forgotten,
298# since that's what those who live here have done.
299
300# From Arthur David Olson (November 21, 1992):
301# East-Saskatchewan kept to avoid problems for folks using that zone by name;
302# plain Saskatchewan added.
303
304
305# From Shanks (1991):
306# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
307Rule StJohns 1884 only - Jan 1 0:00 0 S
308Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D
309Rule StJohns 1917 only - Sep 17 2:00 0 S
310Rule StJohns 1918 only - Oct 31 2:00 0 S
311# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks.
312Rule StJohns 1919 only - May 5 23:00 1:00 D
313Rule StJohns 1919 only - Aug 12 23:00 0 S
314# For 1931-1935 Whitman gives Apr same date; go with Shanks.
315Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
316Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
317# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman.
318Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D
319Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S
320# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman.
321Rule StJohns 1942 only - Mar 1 0:00 1:00 D
322Rule StJohns 1942 only - Dec 31 0:00 0 S
323Rule StJohns 1943 only - May 30 0:00 1:00 D
324Rule StJohns 1943 only - Sep 5 0:00 0 S
325Rule StJohns 1944 only - Jul 10 0:00 1:00 D
326Rule StJohns 1944 only - Sep 2 0:00 0 S
327Rule StJohns 1945 only - Jan 1 0:00 1:00 D
328Rule StJohns 1945 only - Oct 7 2:00 0 S
329# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
330# Apr 30 - Sep 24; go with Shanks.
331Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
332Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
333Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
334Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
335Rule StJohns 1960 max - Oct lastSun 2:00 0 S
336Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D
337Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 D
338Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D
339# St John's has an apostrophe, but Posix file names can't have apostrophes.
340# Zone NAME GMTOFF RULES FORMAT [UNTIL]
341Zone America/St_Johns -3:30:52 - LMT 1884
342 -3:31 StJohns N%sT 1935 Mar 30
343 -3:30 StJohns N%sT
344
345# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
346Rule Halifax 1902 only - Jun 15 0:00 0 S
347Rule Halifax 1916 only - Apr 1 0:00 1:00 D
348Rule Halifax 1916 only - Oct 1 0:00 0 S
349Rule Halifax 1918 only - Apr 14 2:00 1:00 D
350Rule Halifax 1918 only - Oct 31 2:00 0 S
351Rule Halifax 1920 only - May 9 0:00 1:00 D
352Rule Halifax 1920 only - Aug 29 0:00 0 S
353Rule Halifax 1921 only - May 6 0:00 1:00 D
354Rule Halifax 1921 1922 - Sep 5 0:00 0 S
355Rule Halifax 1922 only - Apr 30 0:00 1:00 D
356Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
357Rule Halifax 1923 only - Sep 4 0:00 0 S
358Rule Halifax 1924 only - Sep 15 0:00 0 S
359Rule Halifax 1925 only - Sep 28 0:00 0 S
360Rule Halifax 1926 only - May 16 0:00 1:00 D
361Rule Halifax 1926 only - Sep 13 0:00 0 S
362Rule Halifax 1927 only - May 1 0:00 1:00 D
363Rule Halifax 1927 only - Sep 26 0:00 0 S
364Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
365Rule Halifax 1928 only - Sep 9 0:00 0 S
366Rule Halifax 1929 only - Sep 3 0:00 0 S
367Rule Halifax 1930 only - Sep 15 0:00 0 S
368Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
369Rule Halifax 1933 only - Apr 30 0:00 1:00 D
370Rule Halifax 1933 only - Oct 2 0:00 0 S
371Rule Halifax 1934 only - May 20 0:00 1:00 D
372Rule Halifax 1934 only - Sep 16 0:00 0 S
373Rule Halifax 1935 only - Jun 2 0:00 1:00 D
374Rule Halifax 1935 only - Sep 30 0:00 0 S
375Rule Halifax 1936 only - Jun 1 0:00 1:00 D
376Rule Halifax 1936 only - Sep 14 0:00 0 S
377Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
378Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
379Rule Halifax 1939 only - May 28 0:00 1:00 D
380Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
381Rule Halifax 1942 only - Feb 9 2:00 1:00 D
382Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S
383Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D
384Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D
385Rule Halifax 1962 max - Oct lastSun 2:00 0 S
386Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D
387# Zone NAME GMTOFF RULES FORMAT [UNTIL]
388Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
389 -4:00 Halifax A%sT
390
391# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
392Rule Mont 1884 only - Jan 1 0:00 0 S
393Rule Mont 1917 only - Mar 25 2:00 1:00 D
394Rule Mont 1917 only - Apr 24 0:00 0 S
395Rule Mont 1918 only - Apr 14 2:00 1:00 D
396Rule Mont 1918 only - Oct 31 2:00 0 S
397Rule Mont 1919 only - Mar 31 2:30 1:00 D
398Rule Mont 1919 only - Oct 25 2:30 0 S
399Rule Mont 1920 only - May 2 2:30 1:00 D
400Rule Mont 1920 only - Oct 3 2:30 0 S
401Rule Mont 1921 only - May 1 2:00 1:00 D
402Rule Mont 1921 only - Oct 2 2:30 0 S
403Rule Mont 1922 only - Apr 30 2:00 1:00 D
404Rule Mont 1922 only - Oct 1 2:30 0 S
405Rule Mont 1924 only - May 17 2:00 1:00 D
406Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
407Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
408Rule Mont 1927 only - May 1 0:00 1:00 D
409Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S
410Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D
411Rule Mont 1932 only - May 1 0:00 1:00 D
412Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D
413Rule Mont 1933 only - Oct 1 0:00 0 S
414Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S
415Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
416Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D
417Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
418Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
419Rule Mont 1957 max - Oct lastSun 2:00 0 S
420Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D
421# Zone NAME GMTOFF RULES FORMAT [UNTIL]
422Zone America/Montreal -4:54:16 - LMT 1884
423 -5:00 Mont E%sT
424
425# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
426Rule Winn 1887 only - Jul 16 0:00 0 S
427Rule Winn 1916 only - Apr 23 0:00 1:00 D
428Rule Winn 1916 only - Sep 17 0:00 0 S
429Rule Winn 1918 only - Apr 14 2:00 1:00 D
430Rule Winn 1918 only - Oct 31 2:00 0 S
431Rule Winn 1937 only - May 16 2:00 1:00 D
432Rule Winn 1937 only - Sep 23 2:00 0 S
433Rule Winn 1942 only - Feb 9 2:00 1:00 D
434Rule Winn 1945 only - Sep lastSun 2:00 0 S
435Rule Winn 1946 only - May 12 2:00 1:00 D
436Rule Winn 1946 only - Oct 13 2:00 0 S
437Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
438Rule Winn 1947 1958 - Sep lastSun 2:00 0 S
439Rule Winn 1948 only - May 1 2:00 1:00 D
440Rule Winn 1948 1960 - Apr lastSun 2:00 1:00 D
441Rule Winn 1959 only - Oct lastSun 2:00 0 S
442Rule Winn 1960 only - Sep lastSun 2:00 0 S
443Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
444Rule Winn 1963 only - Sep lastSun 2:00 0 S
445Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D
446Rule Winn 1966 max - Sep lastSun 2:00 0 S
447Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D
448# Zone NAME GMTOFF RULES FORMAT [UNTIL]
449Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
450 -6:00 Winn C%sT
451
452# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
453Rule Regina 1905 only - Sep 1 0:00 0 S
454Rule Regina 1918 only - Apr 14 2:00 1:00 D
455Rule Regina 1918 only - Oct 31 2:00 0 S
456Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
457Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
458Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
459Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
460Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
461Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
462Rule Regina 1942 only - Feb 9 2:00 1:00 D
463Rule Regina 1945 only - Sep lastSun 2:00 0 S
464Rule Regina 1946 only - Apr 14 2:00 1:00 D
465Rule Regina 1946 only - Oct 13 2:00 0 S
466Rule Regina 1947 1960 - Apr lastSun 2:00 1:00 D
467Rule Regina 1947 1959 - Sep lastSun 2:00 0 S
468# Zone NAME GMTOFF RULES FORMAT [UNTIL]
469Zone America/Regina -6:58:36 - LMT 1905 Sep
470 -7:00 Regina M%sT 1966 Apr 15
471 -6:00 - CST
472
473# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
474Rule Edm 1906 only - Sep 1 0:00 0 S
475Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
476Rule Edm 1918 only - Oct 31 2:00 0 S
477Rule Edm 1919 only - May 27 2:00 0 S
478Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
479Rule Edm 1920 only - Oct lastSun 2:00 0 S
480Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
481Rule Edm 1942 only - Feb 9 2:00 1:00 D
482Rule Edm 1945 only - Sep lastSun 2:00 0 S
483Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
484Rule Edm 1947 only - Sep lastSun 2:00 0 S
485Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
486Rule Edm 1967 only - Oct lastSun 2:00 0 S
487Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
488Rule Edm 1969 only - Oct lastSun 2:00 0 S
489Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
490Rule Edm 1972 max - Oct lastSun 2:00 0 S
491Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D
492# Zone NAME GMTOFF RULES FORMAT [UNTIL]
493Zone America/Edmonton -7:33:52 - LMT 1906 Sep
494 -7:00 Edm M%sT
495
496# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
497Rule Vanc 1884 only - Jan 1 0:00 0 S
498Rule Vanc 1918 only - Apr 14 2:00 1:00 D
499Rule Vanc 1918 only - Oct 31 2:00 0 S
500Rule Vanc 1942 only - Feb 9 2:00 1:00 D
501Rule Vanc 1945 only - Sep 30 2:00 0 S
502Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
503Rule Vanc 1946 only - Oct 13 2:00 0 S
504Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
505Rule Vanc 1962 max - Oct lastSun 2:00 0 S
506Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D
507# Zone NAME GMTOFF RULES FORMAT [UNTIL]
508Zone America/Vancouver -8:12:28 - LMT 1884
509 -8:00 Vanc P%sT
510
511# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
512Rule Yukon 1900 only - Jan 1 0:00 0 S
513Rule Yukon 1918 only - Apr 14 2:00 1:00 D
514Rule Yukon 1918 only - Oct 27 2:00 0 S
515Rule Yukon 1919 only - May 25 2:00 1:00 D
516Rule Yukon 1919 only - Nov 1 0:00 0 S
517Rule Yukon 1942 only - Feb 9 2:00 1:00 D
518Rule Yukon 1965 only - Apr 25 0:00 1:00 D
519Rule Yukon 1965 only - Oct 31 2:00 0 S
520Rule Yukon 1980 1986 - Apr lastSun 2:00 1:00 D
521Rule Yukon 1980 max - Oct lastSun 2:00 0 S
522Rule Yukon 1987 max - Apr Sun>=1 2:00 1:00 D
523# Zone NAME GMTOFF RULES FORMAT [UNTIL]
524Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
525 -9:00 Yukon Y%sT 1966 Jul
526 -8:00 Yukon P%sT
527# Parts of Yukon (e.g. Dawson) didn't switch to -8:00 until 1973 Oct 28.
528
529###############################################################################
530
531# Mexico
532
533# From Guy Harris:
534# Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
535# Rules prior to 1987 are unknown.
536# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
537# observe DST." This is presumably Baja California Norte, above 28th parallel,
538# as listed there; Mexico/BajaSur is for "Baja California Sur and N. Pacific
539# Coast (States of Sinaloa and Sonora)."
540
541# From Bob Devine (January 28, 1988):
542# The Federal District (where Mexico City is) has observed [DST] several
543# times but not recently.
544#
545# I don't where to drawn the line in the North Baja area. 28th latitude
546# sounds good -- but it may be higher (how far [d]o radio stations from
547# San Diego affect culture?).
548#
549# The dates of DST probably go back to 1981. The rules are the same as
550# US's. This is going to be a headache for US presidential electi[o]n years!
551
552# From Arthur David Olson (February 13, 1988)
553# Since the 1981 starting date is only "probable," we'll keep the 1987
554# starting date below.
555
556# From U. S. Naval Observatory (January 19, 1989):
557# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
558# MEXICO BAJA CAL N N. PACIFIC COAST (STATES
559# MEXICO BAJA CAL N OF SINALOA AND SONORA)
560# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLAL APR 3
561# MEXICO BAJA CAL N - OCT 29
562# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL APR 3
563# MEXICO BAJA CAL N - 0CT 29
564# MEXICO 6 H BEHIND UTC STATES OF DURANGO,
565# MEXICO COAHUILA, NUEVO LEON,
566# MEXICO TAMAULIPAS
567# MEXICO 5 H BEHIND UTC STATES OF DURANGO,
568# MEXICO COAHUILA, NUEVO LEON,
569# MEXICO TAMAULIPAS APR 3 - OCT 29
570# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
571# MEXICO CAMPECHE, QUINTANA ROO AND
572# MEXICO YUCATAN
573
574# From Arthur David Olson (January 21, 1989):
575# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
576# USNO claims there should be four Mexican zones rather than three:
577# a zone that's GMT-8 with DST; a zone that's always GMT-7;
578# a zone that's GMT-6 with DST; and a zone that's always GMT-6.
579
580# From Paul Eggert <eggert@twinsun.com> (November 18, 1993):
581# Shanks also says there are four zones, but disagrees about the fourth.
582# Instead of GMT-6 with DST, he says there's GMT-8 without DST.
583
584# From Shanks (1991):
585# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
586Rule Mexico 1922 only - Jan 1 0:00 0 S
587Rule Mexico 1939 only - Feb 5 0:00 1:00 D
588Rule Mexico 1939 only - Jun 25 0:00 0 S
589Rule Mexico 1940 only - Dec 9 0:00 1:00 D
590Rule Mexico 1941 only - Apr 1 0:00 0 S
591Rule Mexico 1943 only - Dec 16 0:00 1:00 D
592Rule Mexico 1944 only - May 1 0:00 0 S
593Rule Mexico 1950 only - Feb 12 0:00 1:00 D
594Rule Mexico 1950 only - Jul 30 0:00 0 S
595Rule BajaN 1950 1966 - Apr lastSun 2:00 1:00 D
596Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S
597Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S
598# Zone NAME GMTOFF RULES FORMAT [UNTIL]
599Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
600 -7:00 - MST 1927 Jun 10 23:00
601 -6:00 - CST 1930 Nov 15
602 -7:00 - MST 1931 May 1 23:00
603 -6:00 - CST 1931 Oct
604 -7:00 - MST 1932 Mar 30 23:00
605 -6:00 Mexico C%sT
606Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
607 -7:00 - MST 1927 Jun 10 23:00
608 -6:00 - CST 1930 Nov 15
609 -7:00 - MST 1931 May 1 23:00
610 -6:00 - CST 1931 Oct
611 -7:00 - MST 1932 Mar 30 23:00
612 -6:00 - CST 1942 Apr
613 -7:00 - MST 1949 Jan 14
614 -8:00 - PST 1970
615 -7:00 - MST
616Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
617 -8:00 - PST 1927 Jun 10 23:00
618 -7:00 - MST 1930 Nov 16
619 -8:00 - PST 1942 Apr
620 -7:00 - MST 1949 Jan 14
621 -8:00 BajaN P%sT 1967 Apr lastSun 2:00
622 -8:00 US P%sT
623Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32
624 -8:00 - PST 1927 Jun 10 23:00
625 -7:00 - MST 1930 Nov 16
626 -8:00 - PST 1942 Apr
627 -7:00 - MST 1949 Jan 14
628 -8:00 - PST
629#
630# Revillagigedo Is
631# no information
632
633###############################################################################
634
635# Anguilla
636# Zone NAME GMTOFF RULES FORMAT [UNTIL]
637Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
638 -4:00 - AST
639
640# Antigua and Barbuda
641# Zone NAME GMTOFF RULES FORMAT [UNTIL]
642Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
643 -5:00 - EST 1951
644 -4:00 - AST
645
646# Bahamas
647# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
648Rule Bahamas 1912 only - Mar 2 0:00 0 S
649Rule Bahamas 1964 max - Oct lastSun 2:00 0 S
650Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D
651Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D
652# Zone NAME GMTOFF RULES FORMAT [UNTIL]
653Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
654 -5:00 Bahamas E%sT
655
656# Barbados
657# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
658Rule Barb 1932 only - Jan 1 0:00 0 S
659Rule Barb 1977 only - Jun 12 2:00 1:00 D
660Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
661Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
662Rule Barb 1979 only - Sep 30 2:00 0 S
663Rule Barb 1980 only - Sep 25 2:00 0 S
664# Zone NAME GMTOFF RULES FORMAT [UNTIL]
665Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
666 -3:58 - BMT 1932 # Bridgetown Mean Time
667 -4:00 Barb A%sT
668
669# Belize
670# Whitman entirely disagrees with Shanks; go with Shanks.
671# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
672Rule Belize 1912 only - Apr 1 0:00 0 S
673Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
674Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
675Rule Belize 1973 only - Dec 5 0:00 1:00 D
676Rule Belize 1974 only - Feb 9 0:00 0 S
677Rule Belize 1982 only - Dec 18 0:00 1:00 D
678Rule Belize 1983 only - Feb 12 0:00 0 S
679# Zone NAME GMTOFF RULES FORMAT [UNTIL]
680Zone America/Belize -5:52:48 - LMT 1912 Apr
681 -6:00 Belize C%sT
682
683# Bermuda
684# Zone NAME GMTOFF RULES FORMAT [UNTIL]
685Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
686 -4:00 - AST 1974 Apr 28 2:00
687 -4:00 Bahamas A%sT
688
689# Cayman Is
690# Zone NAME GMTOFF RULES FORMAT [UNTIL]
691Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
692 -5:07 - KMT 1912 Feb # Kingston Mean Time
693 -5:00 - EST
694
695# Clipperton
696# no information
697
698# Costa Rica
699# Shanks gives some very odd dates for 1991, and stops there.
700# For now, we won't guess further.
701# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
702Rule CR 1921 only - Jan 15 0:00 0 S
703Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
704Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
705Rule CR 1991 only - Jan 19 0:00 1:00 D
706Rule CR 1991 only - Jul 1 0:00 0 S
707# There are too many San Joses elsewhere, so we'll use `Costa Rica'.
708# Zone NAME GMTOFF RULES FORMAT [UNTIL]
709Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
710 -5:36 - SJMT 1921 Jan 15 # San Jose Mean Time
711 -6:00 CR C%sT
712# Coco
713# no information; probably like America/Costa_Rica
714
715# Cuba
716
717# From Bob Devine (January 28, 1988):
718# . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981.
719# Change at midnight. In 1979 & 1980, started at 3rd Sunday in March
720# (I think).
721
722# From U. S. Naval Observatory (January 19, 1989):
723# CUBA 5 H BEHIND UTC
724# CUBA 4 H BEHIND UTC MAR 20 - OCT 8
725
726# From Shanks (1991):
727# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
728Rule Cuba 1925 only - Jul 19 12:00 0 S
729Rule Cuba 1928 only - Jun 10 0:00 1:00 D
730Rule Cuba 1928 only - Oct 10 0:00 0 S
731Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
732Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
733Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
734Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
735Rule Cuba 1965 only - Jun 1 0:00 1:00 D
736Rule Cuba 1965 only - Sep 30 0:00 0 S
737Rule Cuba 1966 only - May 29 0:00 1:00 D
738Rule Cuba 1966 only - Oct 2 0:00 0 S
739Rule Cuba 1967 only - Apr 8 0:00 1:00 D
740Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
741Rule Cuba 1968 only - Apr 14 0:00 1:00 D
742Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
743Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
744Rule Cuba 1972 1974 - Oct 8 0:00 0 S
745Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
746Rule Cuba 1978 only - May 7 0:00 1:00 D
747Rule Cuba 1978 1980 - Oct Sun>=8 0:00 0 S
748Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
749Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
750Rule Cuba 1981 max - Oct Sun>=8 0:00 0 S
751Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
752Rule Cuba 1990 only - Apr 1 0:00 1:00 D
753Rule Cuba 1991 max - Mar Sun>=14 0:00 1:00 D
754
755# Zone NAME GMTOFF RULES FORMAT [UNTIL]
756Zone America/Havana -5:29:28 - LMT 1890
757 -5:30 - HMT 1925 Jul 19 12:00 # Havana MT
758 -5:00 Cuba C%sT
759
760# Dominica
761# Zone NAME GMTOFF RULES FORMAT [UNTIL]
762Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
763 -4:00 - AST
764
765# Dominican Republic
766# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
767Rule DR 1933 only - Apr 1 12:00 0 S
768Rule DR 1966 only - Oct 30 0:00 1:00 D
769Rule DR 1967 only - Feb 28 0:00 0 S
770Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
771Rule DR 1970 only - Feb 21 0:00 0 S
772Rule DR 1971 only - Jan 20 0:00 0 S
773Rule DR 1972 1974 - Jan 21 0:00 0 S
774# Zone NAME GMTOFF RULES FORMAT [UNTIL]
775Zone America/Santo_Domingo -4:39:36 - LMT 1890
776 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
777 -5:00 DR E%sT 1974 Oct 27
778 -4:00 - AST
779
780# El Salvador
781# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
782Rule Salv 1921 only - Jan 1 0:00 0 S
783Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
784Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
785# There are too many San Salvadors elsewhere, so we'll use `El Salvador'.
786# Zone NAME GMTOFF RULES FORMAT [UNTIL]
787Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
788 -6:00 Salv C%sT
789
790# Grenada
791# Zone NAME GMTOFF RULES FORMAT [UNTIL]
792Zone America/Grenada -4:07:00 - LMT 1911 Jul
793 -4:00 - AST
794
795# Guadeloupe
796# Zone NAME GMTOFF RULES FORMAT [UNTIL]
797Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
798 -4:00 - AST
799
800# Guatemala
801# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
802Rule Guat 1918 only - Oct 5 0:00 0 S
803Rule Guat 1973 only - Nov 25 0:00 1:00 D
804Rule Guat 1974 only - Feb 24 0:00 0 S
805Rule Guat 1983 only - May 21 0:00 1:00 D
806Rule Guat 1983 only - Sep 22 0:00 0 S
807# Zone NAME GMTOFF RULES FORMAT [UNTIL]
808Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
809 -6:00 Guat C%sT
810
811# Haiti
812# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
813Rule Haiti 1917 only - Jan 24 12:00 0 S
814Rule Haiti 1983 only - May 8 0:00 1:00 D
815Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
816Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
817Rule Haiti 1988 max - Apr Sun>=1 2:00 1:00 D
818Rule Haiti 1988 max - Oct lastSun 2:00 0 S
819# Zone NAME GMTOFF RULES FORMAT [UNTIL]
820Zone America/Port-au-Prince -4:49:20 - LMT 1890
821 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
822 -5:00 Haiti E%sT
823
824# Honduras
825# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1.
826# Zone NAME GMTOFF RULES FORMAT [UNTIL]
827Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
828 -6:00 Salv C%sT
829
830# Jamaica
831
832# From Bob Devine (January 28, 1988):
833# Follows US rules.
834
835# From U. S. Naval Observatory (January 19, 1989):
836# JAMAICA 5 H BEHIND UTC
837
838# From Shanks (1991):
839# Zone NAME GMTOFF RULES FORMAT [UNTIL]
840Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
841 -5:07 - KMT 1912 Feb # Kingston Mean Time
842 -5:00 - EST 1974 Jan 6 2:00
843 -5:00 US E%sT
844
845# Martinique
846# Zone NAME GMTOFF RULES FORMAT [UNTIL]
847Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
848 -4:04 - FFMT 1911 May # Fort-de-France MT
849 -4:00 - AST 1980 Apr 6
850 -4:00 1:00 ADT 1980 Sep 28
851 -4:00 - AST
852
853# Montserrat
854# Zone NAME GMTOFF RULES FORMAT [UNTIL]
855Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Plymouth
856 -4:00 - AST
857
858# Nicaragua
859# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
860Rule Nic 1975 only - Feb 16 0:00 0 S
861Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
862Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
863# Zone NAME GMTOFF RULES FORMAT [UNTIL]
864Zone America/Managua -5:45:08 - LMT 1890
865 -5:45 - MMT 1934 Jun 23 # Managua Mean Time
866 -6:00 - CST 1973 May
867 -5:00 - EST 1975 Feb 16
868 -6:00 Nic C%sT
869
870# Panama
871# Zone NAME GMTOFF RULES FORMAT [UNTIL]
872Zone America/Panama -5:18:08 - LMT 1890
873 -5:20 - PMT 1908 Apr 22 # Panama Mean Time
874 -5:00 - EST
875
876# Puerto Rico
877# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
878# Zone NAME GMTOFF RULES FORMAT [UNTIL]
879Zone America/Puerto_Rico -4:24:28 - LMT 1899 Mar 28 12:00 # San Juan
880 -4:00 - AST 1942 May 3
881 -4:00 1:00 ADT 1945 Sep 30 2:00
882 -4:00 - AST
883
884# St Kitts-Nevis
885# Zone NAME GMTOFF RULES FORMAT [UNTIL]
886Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
887 -4:00 - AST
888
889# St Lucia
890# Zone NAME GMTOFF RULES FORMAT [UNTIL]
891Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
892 -4:04 - CMT 1912 # Castries Mean Time
893 -4:00 - AST
894
895# St Pierre and Miquelon
896# There are too many St Pierres elsewhere, so we'll use `Miquelon'.
897# Zone NAME GMTOFF RULES FORMAT [UNTIL]
898Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
899 -4:00 - AST 1980 May
900 -3:00 Mont SP%sT
901
902# St Vincent and the Grenadines
903# Zone NAME GMTOFF RULES FORMAT [UNTIL]
904Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
905 -4:05 - KMT 1912 # Kingstown Mean Time
906 -4:00 - AST
907
908# Turks and Caicos
909# Zone NAME GMTOFF RULES FORMAT [UNTIL]
910Zone America/Grand_Turk -4:44:32 - LMT 1890
911 -5:07 - KMT 1912 Feb # Kingston Mean Time
912 -5:00 - EST 1979 Apr 29 2:00
913 -5:00 US E%sT
914
915# Virgin Is (British and US)
916# Zone NAME GMTOFF RULES FORMAT [UNTIL]
917Zone America/Virgin -4:19:44 - LMT 1911 Jul # Charlotte Amalie
918 -4:00 - AST