| blob | 845587fa82054642b9877f2e4c60ee9016d990b3 |
1 # @(#)northamerica 7.51
2 # also includes Central America and the Caribbean
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).
8 # From Paul Eggert <eggert@twinsun.com> (1999-03-22):
9 # A reliable and entertaining source about time zones is
10 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
12 ###############################################################################
14 # United States
16 # From Paul Eggert (1999-03-31):
17 # Howse writes (pp 121-125) that time zones were invented by
18 # Professor Charles Ferdinand Dowd (1825-1904),
19 # Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
20 # His pamphlet ``A System of National Time for Railroads'' (1870)
21 # was the result of his proposals at the Convention of Railroad Trunk Lines
22 # in New York City (1869-10). His 1870 proposal was based on Washington, DC,
23 # but in 1872-05 he moved the proposed origin to Greenwich.
24 # His proposal was adopted by the railroads on 1883-11-18 at 12:00,
25 # and the most of the country soon followed suit.
27 # From Paul Eggert <eggert@twinsun.com> (1995-12-19):
28 # A good source for time zone historical data in the US is
29 # Thomas G. Shanks, The American Atlas (5th edition),
30 # San Diego: ACS Publications, Inc. (1991).
31 # Make sure you have the errata sheet; the book is somewhat useless without it.
32 # It is the source for the US and Puerto Rico entries below.
34 # From Paul Eggert (1996-06-12):
35 # Daylight Saving Time was first suggested as a joke by Benjamin Franklin
36 # in his whimsical essay ``Turkey vs Eagle, McCauley is my Beagle'' (1784).
37 # Not everyone is happy with the results:
38 #
39 # I don't really care how time is reckoned so long as there is some
40 # agreement about it, but I object to being told that I am saving
41 # daylight when my reason tells me that I am doing nothing of the kind.
42 # I even object to the implication that I am wasting something
43 # valuable if I stay in bed after the sun has risen. As an admirer
44 # of moonlight I resent the bossy insistence of those who want to
45 # reduce my time for enjoying it. At the back of the Daylight Saving
46 # scheme I detect the bony, blue-fingered hand of Puritanism, eager
47 # to push people into bed earlier, and get them up earlier, to make
48 # them healthy, wealthy and wise in spite of themselves.
49 #
50 # -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday
52 # From Arthur David Olson:
53 # US Daylight Saving Time ended on the last Sunday of *October* in 1974.
54 # See, for example, the front page of the Saturday, 1974-10-26
55 # and Sunday, 1974-10-27 editions of the Washington Post.
57 # From Arthur David Olson:
58 # Before the Uniform Time Act of 1966 took effect in 1967, observance of
59 # Daylight Saving Time in the US was by local option, except during wartime.
61 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
62 Rule US 1918 1919 - Mar lastSun 2:00 1:00 W # War
63 Rule US 1918 1919 - Oct lastSun 2:00 0 S
64 Rule US 1942 only - Feb 9 2:00 1:00 W # War
65 Rule US 1945 only - Sep 30 2:00 0 S
66 Rule US 1967 max - Oct lastSun 2:00 0 S
67 Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
68 Rule US 1974 only - Jan 6 2:00 1:00 D
69 Rule US 1975 only - Feb 23 2:00 1:00 D
70 Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
71 Rule US 1987 max - Apr Sun>=1 2:00 1:00 D
72 # <a href="http://thomas.loc.gov/cgi-bin/bdquery/z?d106:h.r.00177:">
73 # H.R.177
74 # </a> (introduced 1999-01-06) would change April to March in the above rule.
76 # From Bob Devine (1988-01-28):
77 # ...Alaska (and Hawaii) had the timezone names changed in 1967.
78 # old new
79 # Pacific Standard Time(PST) -same-
80 # Yukon Standard Time(YST) -same-
81 # Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
82 # Nome Standard Time (NT) Bering Standard Time (BST)
83 #
84 # ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
85 # The YST zone now covers nearly all of the state, AHST just part
86 # of the Aleutian islands. No DST.
88 # From Paul Eggert (1995-12-19):
89 # The tables below use `NST', not `NT', for Nome Standard Time.
90 # I invented `CAWT' for Central Alaska War Time.
92 # From U. S. Naval Observatory (1989-01-19):
93 # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
94 # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
95 # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
96 # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
97 # USA MOUNTAIN 7 H BEHIND UTC DENVER
98 # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
99 # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
100 # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
101 # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
102 # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
103 # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
104 # USA - " - 9 H BEHIND UTC APR 3 - OCT 30
105 # USA HAWAII 10 H BEHIND UTC
106 # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
108 # From Arthur David Olson (1989-01-21):
109 # The above dates are for 1988.
110 # Note the "AKST" and "AKDT" abbreviations, the claim that there's
111 # no DST in Samoa, and the claim that there is DST in Alaska and the
112 # Aleutians.
114 # From Arthur David Olson (1988-02-13):
115 # Legal standard time zone names, from United States Code (1982 Edition and
116 # Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
117 # up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
118 # took effect), as explained in sections 263 and 261:
119 # (none)
120 # United States standard eastern time
121 # United States standard mountain time
122 # United States standard central time
123 # United States standard Pacific time
124 # (none)
125 # United States standard Alaska time
126 # (none)
127 # Next, names from 1967-04-01 until 1983-11-30 (the date for
128 # public law 98-181):
129 # Atlantic standard time
130 # eastern standard time
131 # central standard time
132 # mountain standard time
133 # Pacific standard time
134 # Yukon standard time
135 # Alaska-Hawaii standard time
136 # Bering standard time
137 # And after 1983-11-30:
138 # Atlantic standard time
139 # eastern standard time
140 # central standard time
141 # mountain standard time
142 # Pacific standard time
143 # Alaska standard time
144 # Hawaii-Aleutian standard time
145 # Samoa standard time
146 # The law doesn't give abbreviations.
147 #
148 # From Paul Eggert (1995-12-19):
149 # Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions.
150 # Go with Shanks.
152 # US Eastern time, represented by New York
153 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
154 Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
155 Rule NYC 1920 only - Oct lastSun 2:00 0 S
156 Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
157 Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
158 Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
159 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
160 Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00
161 -5:00 US E%sT 1920
162 -5:00 NYC E%sT 1942
163 -5:00 US E%sT 1946
164 -5:00 NYC E%sT 1967
165 -5:00 US E%sT
167 # US Central time, represented by Chicago
168 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
169 Rule Chicago 1920 only - Jun 13 2:00 1:00 D
170 Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
171 Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
172 Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
173 Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
174 Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
175 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
176 Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00
177 -6:00 US C%sT 1920
178 -6:00 Chicago C%sT 1936 Mar 1 2:00
179 -5:00 - EST 1936 Nov 15 2:00
180 -6:00 Chicago C%sT 1942
181 -6:00 US C%sT 1946
182 -6:00 Chicago C%sT 1967
183 -6:00 US C%sT
185 # US Mountain time, represented by Denver
186 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
187 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
188 Rule Denver 1920 only - Oct lastSun 2:00 0 S
189 Rule Denver 1921 only - May 22 2:00 0 S
190 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
191 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
192 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
193 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00
194 -7:00 US M%sT 1920
195 -7:00 Denver M%sT 1942
196 -7:00 US M%sT 1946
197 -7:00 Denver M%sT 1967
198 -7:00 US M%sT
200 # US Pacific time, represented by Los Angeles
201 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
202 Rule CA 1948 only - Mar 14 2:00 1:00 D
203 Rule CA 1949 only - Jan 1 2:00 0 S
204 Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
205 Rule CA 1950 1961 - Sep lastSun 2:00 0 S
206 Rule CA 1962 1966 - Oct lastSun 2:00 0 S
207 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
208 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00
209 -8:00 US P%sT 1946
210 -8:00 CA P%sT 1967
211 -8:00 US P%sT
213 # Alaska
214 # AK%sT is the modern abbreviation for -9:00 per USNO.
215 #
216 # From Paul Eggert (1995-12-19):
217 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
218 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
219 # This was on 1867-10-18. We omit this transition, since we can't represent
220 # changes from Julian to Gregorian.
221 #
222 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
223 Zone America/Juneau -8:57:41 - LMT 1900 Aug 20 12:00
224 -8:00 - PST 1942
225 -8:00 US P%sT 1946
226 -8:00 - PST 1969
227 -8:00 US P%sT 1983 Oct 30 2:00
228 -9:00 US AK%sT
229 Zone America/Yakutat -9:18:55 - LMT 1900 Aug 20 12:00
230 -9:00 - YST 1942
231 -9:00 US Y%sT 1946
232 -9:00 - YST 1969
233 -9:00 US Y%sT 1983 Oct 30 2:00
234 -9:00 US AK%sT
235 Zone America/Anchorage -9:59:36 - LMT 1900 Aug 20 12:00
236 -10:00 - CAT 1942
237 -10:00 US CAT/CAWT 1946
238 -10:00 - CAT 1967 Apr
239 -10:00 - AHST 1969
240 -10:00 US AH%sT 1983 Oct 30 2:00
241 -9:00 US AK%sT
242 Zone America/Nome -11:01:38 - LMT 1900 Aug 20 12:00
243 -11:00 - NST 1942
244 -11:00 US N%sT 1946
245 -11:00 - NST 1967 Apr
246 -11:00 - BST 1969
247 -11:00 US B%sT 1983 Oct 30 2:00
248 -9:00 US AK%sT
249 Zone America/Adak -11:46:38 - LMT 1900 Aug 20 12:00
250 -11:00 - NST 1942
251 -11:00 US N%sT 1946
252 -11:00 - NST 1967 Apr
253 -11:00 - BST 1969
254 -11:00 US B%sT 1983 Oct 30 2:00
255 -10:00 US HA%sT
256 # Shanks writes that part of southwest Alaska (e.g. Aniak)
257 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
258 # and another part (e.g. Akiak) made the same switch five weeks later.
259 # These switches don't quite make our 1970 cutoff.
261 # Hawaii
262 #
263 # From Arthur David Olson:
264 # And then there's Hawaii.
265 # DST was observed for one day in 1933;
266 # standard time was changed by half an hour in 1947;
267 # it's always standard as of 1986.
268 #
269 # From Paul Eggert:
270 # Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.
271 #
272 Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00
273 -10:30 - HST 1933 Apr 30 2:00
274 -10:30 1:00 HDT 1933 May 21 2:00
275 -10:30 US H%sT 1947 Jun 8 2:00
276 -10:00 - HST
278 # Now we turn to US areas that have diverged from the consensus since 1970.
280 # Arizona mostly uses MST.
281 Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00
282 -7:00 US M%sT 1944 Jan 1 00:01
283 -7:00 - MST 1944 Mar 17 00:01
284 -7:00 US M%sT 1944 Oct 1 00:01
285 -7:00 - MST 1967
286 -7:00 US M%sT 1968
287 -7:00 - MST
288 # From Arthur David Olson (1988-02-13):
289 # A writer from the Inter Tribal Council of Arizona, Inc.,
290 # notes in private correspondence dated 12/28/87 that "Presently, only the
291 # Navajo Nation participates in the Daylight Saving Time policy, due to its
292 # large size and location in three states." (The "only" means that other
293 # tribal nations don't use DST.)
295 Link America/Denver America/Shiprock
297 # Southern Idaho and eastern Oregon switched four weeks late in 1974.
298 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
299 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00
300 -8:00 US P%sT 1923 May 13 2:00
301 -7:00 US M%sT 1974
302 -7:00 - MST 1974 Feb 3 2:00
303 -7:00 US M%sT
305 # Indiana
306 #
307 # For a map of Indiana's time zone regions, see:
308 # <a href="http://www.mccsc.edu/time.html">
309 # What time is it in Indiana?
310 # </a> (1999-04-06)
311 #
312 # From Paul Eggert (1995-12-19):
313 # Indiana generally observes either EST all year, or CST/CDT,
314 # but areas near Cincinnati and Louisville use those cities' timekeeping
315 # and in 1969 and 1970 the whole state observed daylight time;
316 # and there are other exceptions as noted below.
317 # Shanks partitions Indiana into 345 regions, each with its own time history,
318 # and writes ``Even newspaper reports present contradictory information.''
319 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
320 #
321 # Since 1970, EST-only Indiana has been like America/Indianapolis,
322 # with exceptions noted below for Crawford, Starke, and Switzerland counties.
323 # The parts of Indiana not listed below have been like America/Chicago,
324 # America/Louisville, or America/New_York.
325 #
326 # Other than Indianapolis, the Indiana place names are so nondescript
327 # that they would be ambiguous if we left them at the `America' level.
328 # So we reluctantly put them all in a subdirectory `America/Indiana'.
329 #
330 # Most of EST-only Indiana last observed DST in 1970.
331 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
332 Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
333 Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
334 Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
335 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
336 Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00
337 -6:00 US C%sT 1920
338 -6:00 Indianapolis C%sT 1942
339 -6:00 US C%sT 1946
340 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
341 -5:00 - EST 1957 Sep 29 2:00
342 -6:00 - CST 1958 Apr 27 2:00
343 -5:00 - EST 1969
344 -5:00 US E%sT 1971
345 -5:00 - EST
346 Link America/Indianapolis America/Indiana/Indianapolis
347 #
348 # Part of Crawford County, Indiana, last observed DST in 1975,
349 # and left its clocks alone in 1974.
350 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
351 Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
352 Rule Marengo 1951 only - Sep lastSun 2:00 0 S
353 Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
354 Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
355 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
356 Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00
357 -6:00 US C%sT 1951
358 -6:00 Marengo C%sT 1961 Apr 30 2:00
359 -5:00 - EST 1969
360 -5:00 US E%sT 1974 Jan 6 2:00
361 -6:00 1:00 CDT 1974 Oct 27 2:00
362 -5:00 US E%sT 1976
363 -5:00 - EST
364 #
365 # Starke County, Indiana
366 # From Arthur David Olson (1991-10-28):
367 # An article on page A3 of the Sunday, 1991-10-27 Washington Post
368 # notes that Starke County switched from Central time to Eastern time as of
369 # 1991-10-27.
370 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
371 Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
372 Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
373 Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
374 Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
375 Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
376 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
377 Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00
378 -6:00 US C%sT 1947
379 -6:00 Starke C%sT 1962 Apr 29 2:00
380 -5:00 - EST 1963 Oct 27 2:00
381 -6:00 US C%sT 1991 Oct 27 2:00
382 -5:00 - EST
383 #
384 # Switzerland County, Indiana, last observed DST in 1972.
385 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
386 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00
387 -6:00 US C%sT 1954 Apr 25 2:00
388 -5:00 - EST 1969
389 -5:00 US E%sT 1973
390 -5:00 - EST
392 # Part of Kentucky left its clocks alone in 1974.
393 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
394 Rule Louisville 1921 only - May 1 2:00 1:00 D
395 Rule Louisville 1921 only - Sep 1 2:00 0 S
396 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
397 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
398 Rule Louisville 1946 only - Jun 2 2:00 0 S
399 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
400 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
401 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
402 Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00
403 -6:00 US C%sT 1921
404 -6:00 Louisville C%sT 1942
405 -6:00 US C%sT 1946
406 -6:00 Louisville C%sT 1961 Jul 23 2:00
407 -5:00 - EST 1968
408 -5:00 US E%sT 1974 Jan 6 2:00
409 -6:00 1:00 CDT 1974 Oct 27 2:00
410 -5:00 US E%sT
411 # Wayne, Clinton, and Russell Counties, Kentucky
412 # From
413 # <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=99-26945-filed">
414 # Federal Register Doc. 99-26945
415 # </a> (1999-10-14 08:45-04)
416 # In response to a petition by the Wayne County, Kentucky, Fiscal Court,
417 # the Department of Transportation (DOT) proposed to move Wayne County,
418 # Kentucky, from the Central Time Zone to the Eastern Time Zone.... Now
419 # the earliest date that the proposed change might take effect is
420 # October 29, 2000.
421 #
422 # From
423 # <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml">
424 # Lake Cumberland LIFE
425 # </a> (1999-01-29) via WKYM-101.7:
426 # Clinton County has joined Wayne County in asking the DoT to change from
427 # the Central to the Eastern time zone.... The Wayne County government made
428 # the same request in December. And while Russell County officials have not
429 # taken action, the majority of respondents to a poll conducted there in
430 # August indicated they would like to change to "fast time" also.
431 # The three Lake Cumberland counties are the farthest east of any U.S.
432 # location in the Central time zone.
434 # Michigan
435 #
436 # From Bob Devine (1988-01-28):
437 # Michigan didn't observe DST from 1968 to 1973.
438 #
439 # From Paul Eggert (1999-03-31):
440 # Shanks writes that Michigan started using standard time on 1885-09-18,
441 # but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
442 # that Detroit kept
443 #
444 # local time until 1900 when the City Council decreed that clocks should
445 # be put back twenty-eight minutes to Central Standard Time. Half the
446 # city obeyed, half refused. After considerable debate, the decision
447 # was rescinded and the city reverted to Sun time. A derisive offer to
448 # erect a sundial in front of the city hall was referred to the
449 # Committee on Sewers. Then, in 1905, Central time was adopted
450 # by city vote.
451 #
452 # This story is too entertaining to be false, so go with Howse over Shanks.
453 #
454 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
455 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
456 Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
457 Rule Detroit 1948 only - Sep lastSun 2:00 0 S
458 Rule Detroit 1967 only - Jun 14 2:00 1:00 D
459 Rule Detroit 1967 only - Oct lastSun 2:00 0 S
460 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
461 Zone America/Detroit -5:32:11 - LMT 1905
462 -6:00 - CST 1915 May 15 2:00
463 -5:00 - EST 1942
464 -5:00 US E%sT 1946
465 -5:00 Detroit E%sT 1973
466 -5:00 US E%sT 1975
467 -5:00 - EST 1975 Apr 27 2:00
468 -5:00 US E%sT
469 #
470 # The Michigan border with Wisconsin switched from EST to CST/CDT in 1973.
471 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
472 Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
473 Rule Menominee 1946 only - Sep lastSun 2:00 0 S
474 Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
475 Rule Menominee 1966 only - Oct lastSun 2:00 0 S
476 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
477 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
478 -6:00 US C%sT 1946
479 -6:00 Menominee C%sT 1969 Apr 27 2:00
480 -5:00 - EST 1973 Apr 29 2:00
481 -6:00 US C%sT
483 # Navassa
484 # claimed by US under the provisions of the 1856 Guano Islands Act
485 # also claimed by Haiti
486 # occupied 1857/1900 by the Navassa Phosphate Co
487 # US lighthouse 1917/1997-01
488 # currently uninhabited
489 # see Mark Fineman, ``An Isle Rich in Guano and Discord'',
490 # _Los Angeles Times_ (1998-11-10), A1, A10; it cites
491 # Jimmy Skaggs, _The Great Guano Rush_ (1994).
493 # Old names, for S5 users
495 # Link LINK-FROM LINK-TO
496 Link America/New_York EST5EDT
497 Link America/Chicago CST6CDT
498 Link America/Denver MST7MDT
499 Link America/Los_Angeles PST8PDT
500 Link America/Indianapolis EST
501 Link America/Phoenix MST
502 Link Pacific/Honolulu HST
504 ################################################################################
507 # From Paul Eggert <eggert@twinsun.com> (1999-10-29):
508 # A good source for time zone historical data outside the US is
509 # Thomas G. Shanks, The International Atlas (5th edition),
510 # San Diego: ACS Publications, Inc. (1999).
511 #
512 # Gwillim Law <Gwil_Law@bridge-point.com> writes that a good source
513 # for recent time zone data is the International Air Transport
514 # Association's Standard Schedules Information Manual (IATA SSIM),
515 # published semiannually. Law sent in several helpful summaries
516 # of the IATA's data after 1990.
517 #
518 # Except where otherwise noted, Shanks is the source for entries through 1990,
519 # and IATA SSIM is the source for entries after 1990.
520 #
521 # Another source occasionally used is Edward W. Whitman, World Time Differences,
522 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
523 # I found in the UCLA library.
524 #
525 # See the `europe' file for Greenland.
527 # Canada
529 # From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14):
530 # I post here the time zone abbreviations standardized in Canada
531 # for both English and French in the CAN/CSA-Z234.4-89 standard....
532 #
533 # UTC Standard time Daylight savings time
534 # offset French English French English
535 # -2:30 - - HAT NDT
536 # -3 - - HAA ADT
537 # -3:30 HNT NST - -
538 # -4 HNA AST HAE EDT
539 # -5 HNE EST HAC CDT
540 # -6 HNC CST HAR MDT
541 # -7 HNR MST HAP PDT
542 # -8 HNP PST HAY YDT
543 # -9 HNY YST - -
544 #
545 # HN: Heure Normale ST: Standard Time
546 # HA: Heure Avanc<e'>e DT: Daylight saving Time
547 #
548 # A: de l'Atlantique Atlantic
549 # C: du Centre Central
550 # E: de l'Est Eastern
551 # M: Mountain
552 # N: Newfoundland
553 # P: du Pacifique Pacific
554 # R: des Rocheuses
555 # T: de Terre-Neuve
556 # Y: du Yukon Yukon
557 #
558 # From Paul Eggert <eggert@twinsun.com> (1994-11-22):
559 # Alas, this sort of thing must be handled by localization software.
561 # The data for Canada are all from Shanks.
564 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
565 Rule Canada 1918 only - Apr 14 2:00 1:00 D
566 Rule Canada 1918 only - Oct 31 2:00 0 S
567 Rule Canada 1942 only - Feb 9 2:00 1:00 D
568 Rule Canada 1945 only - Sep 30 2:00 0 S
569 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
570 Rule Canada 1974 max - Oct lastSun 2:00 0 S
571 Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D
574 # Newfoundland (except Labrador)
576 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
577 Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D
578 Rule StJohns 1917 only - Sep 17 2:00 0 S
579 Rule StJohns 1918 only - Oct 31 2:00 0 S
580 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks.
581 Rule StJohns 1919 only - May 5 23:00 1:00 D
582 Rule StJohns 1919 only - Aug 12 23:00 0 S
583 # For 1931-1935 Whitman gives Apr same date; go with Shanks.
584 Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
585 Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
586 # For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman.
587 Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D
588 Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S
589 # Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman.
590 Rule StJohns 1942 only - Mar 1 0:00 1:00 D
591 Rule StJohns 1942 only - Dec 31 0:00 0 S
592 Rule StJohns 1943 only - May 30 0:00 1:00 D
593 Rule StJohns 1943 only - Sep 5 0:00 0 S
594 Rule StJohns 1944 only - Jul 10 0:00 1:00 D
595 Rule StJohns 1944 only - Sep 2 0:00 0 S
596 Rule StJohns 1945 only - Jan 1 0:00 1:00 D
597 Rule StJohns 1945 only - Oct 7 2:00 0 S
598 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
599 # Apr 30 - Sep 24; go with Shanks.
600 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
601 Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
602 Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
603 Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
604 Rule StJohns 1960 max - Oct lastSun 2:00 0 S
605 Rule StJohns 1987 only - Apr Sun>=1 2:00 1:00 D
606 Rule StJohns 1988 only - Apr Sun>=1 2:00 2:00 DD
607 Rule StJohns 1989 max - Apr Sun>=1 2:00 1:00 D
608 # St John's has an apostrophe, but Posix file names can't have apostrophes.
609 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
610 Zone America/St_Johns -3:30:52 - LMT 1884
611 -3:30:52 StJohns N%sT 1935 Mar 30
612 -3:30 StJohns N%sT
615 # east Labrador
617 # The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
618 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
619 Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
620 -3:30:52 StJohns NST 1919
621 -3:30:52 - NST 1935 Mar 30
622 -3:30 - NST 1936
623 -3:30 StJohns N%sT 1966 Mar 15 2:00
624 -4:00 StJohns A%sT
627 # west Labrador, New Brunswick, Nova Scotia, Prince Edward I
629 # From Paul Eggert (1996-06-12):
630 # Shanks writes that since 1970 most of this region has been like Halifax.
631 # Many locales did not observe peacetime DST until 1972;
632 # Glace Bay, NS is the largest that we know of.
633 # Shanks also writes that Liverpool, NS was the only town in Canada to observe
634 # DST in 1971 but not 1970; for now we'll assume this is a typo.
636 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
637 Rule Halifax 1916 only - Apr 1 0:00 1:00 D
638 Rule Halifax 1916 only - Oct 1 0:00 0 S
639 Rule Halifax 1918 only - Apr 14 2:00 1:00 D
640 Rule Halifax 1918 only - Oct 31 2:00 0 S
641 Rule Halifax 1920 only - May 9 0:00 1:00 D
642 Rule Halifax 1920 only - Aug 29 0:00 0 S
643 Rule Halifax 1921 only - May 6 0:00 1:00 D
644 Rule Halifax 1921 1922 - Sep 5 0:00 0 S
645 Rule Halifax 1922 only - Apr 30 0:00 1:00 D
646 Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
647 Rule Halifax 1923 only - Sep 4 0:00 0 S
648 Rule Halifax 1924 only - Sep 15 0:00 0 S
649 Rule Halifax 1925 only - Sep 28 0:00 0 S
650 Rule Halifax 1926 only - May 16 0:00 1:00 D
651 Rule Halifax 1926 only - Sep 13 0:00 0 S
652 Rule Halifax 1927 only - May 1 0:00 1:00 D
653 Rule Halifax 1927 only - Sep 26 0:00 0 S
654 Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
655 Rule Halifax 1928 only - Sep 9 0:00 0 S
656 Rule Halifax 1929 only - Sep 3 0:00 0 S
657 Rule Halifax 1930 only - Sep 15 0:00 0 S
658 Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
659 Rule Halifax 1933 only - Apr 30 0:00 1:00 D
660 Rule Halifax 1933 only - Oct 2 0:00 0 S
661 Rule Halifax 1934 only - May 20 0:00 1:00 D
662 Rule Halifax 1934 only - Sep 16 0:00 0 S
663 Rule Halifax 1935 only - Jun 2 0:00 1:00 D
664 Rule Halifax 1935 only - Sep 30 0:00 0 S
665 Rule Halifax 1936 only - Jun 1 0:00 1:00 D
666 Rule Halifax 1936 only - Sep 14 0:00 0 S
667 Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
668 Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
669 Rule Halifax 1939 only - May 28 0:00 1:00 D
670 Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
671 Rule Halifax 1942 only - Feb 9 2:00 1:00 D
672 Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S
673 Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D
674 Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D
675 Rule Halifax 1962 max - Oct lastSun 2:00 0 S
676 Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D
677 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
678 Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
679 -4:00 Halifax A%sT
680 Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
681 -4:00 Canada A%sT 1953
682 -4:00 Halifax A%sT 1954
683 -4:00 - AST 1972
684 -4:00 Halifax A%sT
687 # Ontario, Quebec
689 # From Paul Eggert (1996-06-12):
690 # Shanks writes that since 1970 most of this region has been like Montreal.
691 # Thunder Bay skipped DST in 1973.
692 # Many smaller locales did not observe peacetime DST until 1974;
693 # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
694 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
696 # From Paul Eggert (1997-10-17):
697 # msb@sq.com writes that an article in the 1997-10-14 Toronto Star
698 # says that Atikokan, Ontario currently does not observe DST,
699 # but will vote on 11-10 whether to use EST/EDT.
700 # He also writes that the
701 # <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
702 # Ontario Time Act (1990, Chapter T.9)
703 # </a>
704 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
705 # Officially Atikokan is therefore on CST/CDT, and most likely this report
706 # concerns a non-official time observed as a matter of local practice.
707 # For what it's worth, Shanks says that Atikokan has agreed with
708 # Rainy River ever since standard time was introduced.
710 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
711 Rule Mont 1917 only - Mar 25 2:00 1:00 D
712 Rule Mont 1917 only - Apr 24 0:00 0 S
713 Rule Mont 1918 only - Apr 14 2:00 1:00 D
714 Rule Mont 1918 only - Oct 31 2:00 0 S
715 Rule Mont 1919 only - Mar 31 2:30 1:00 D
716 Rule Mont 1919 only - Oct 25 2:30 0 S
717 Rule Mont 1920 only - May 2 2:30 1:00 D
718 Rule Mont 1920 only - Oct 3 2:30 0 S
719 Rule Mont 1921 only - May 1 2:00 1:00 D
720 Rule Mont 1921 only - Oct 2 2:30 0 S
721 Rule Mont 1922 only - Apr 30 2:00 1:00 D
722 Rule Mont 1922 only - Oct 1 2:30 0 S
723 Rule Mont 1924 only - May 17 2:00 1:00 D
724 Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
725 Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
726 Rule Mont 1927 only - May 1 0:00 1:00 D
727 Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S
728 Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D
729 Rule Mont 1932 only - May 1 0:00 1:00 D
730 Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D
731 Rule Mont 1933 only - Oct 1 0:00 0 S
732 Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S
733 Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
734 Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D
735 Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
736 Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
737 Rule Mont 1957 max - Oct lastSun 2:00 0 S
738 Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D
739 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
740 Zone America/Montreal -4:54:16 - LMT 1884
741 -5:00 Mont E%sT
742 Zone America/Thunder_Bay -5:57:00 - LMT 1895
743 -5:00 Canada E%sT 1970
744 -5:00 Mont E%sT 1973
745 -5:00 - EST 1974
746 -5:00 Canada E%sT
747 Zone America/Nipigon -5:53:04 - LMT 1895
748 -5:00 Canada E%sT
749 Zone America/Rainy_River -6:17:56 - LMT 1895
750 -6:00 Canada C%sT
753 # Manitoba
755 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
756 Rule Winn 1916 only - Apr 23 0:00 1:00 D
757 Rule Winn 1916 only - Sep 17 0:00 0 S
758 Rule Winn 1918 only - Apr 14 2:00 1:00 D
759 Rule Winn 1918 only - Oct 31 2:00 0 S
760 Rule Winn 1937 only - May 16 2:00 1:00 D
761 Rule Winn 1937 only - Sep 26 2:00 0 S
762 Rule Winn 1942 only - Feb 9 2:00 1:00 D
763 Rule Winn 1945 only - Sep lastSun 2:00 0 S
764 Rule Winn 1946 only - May 12 2:00 1:00 D
765 Rule Winn 1946 only - Oct 13 2:00 0 S
766 Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
767 Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
768 Rule Winn 1950 only - May 1 2:00 1:00 D
769 Rule Winn 1950 only - Sep 30 2:00 0 S
770 Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
771 Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
772 Rule Winn 1959 only - Oct lastSun 2:00 0 S
773 Rule Winn 1960 only - Sep lastSun 2:00 0 S
774 Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
775 Rule Winn 1963 only - Sep 22 2:00 0 S
776 Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D
777 Rule Winn 1966 max - Oct lastSun 2:00 0 S
778 Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D
779 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
780 Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
781 -6:00 Winn C%sT
784 # Saskatchewan
786 # From Paul Eggert (1996-06-12):
787 # Shanks writes that since 1970 most of this region has been like Regina.
788 # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
789 # Other western towns (e.g. Lloydminster) are like Edmonton.
791 # From W. Jones <jones@skdad.usask.ca> (1992-11-06):
792 # The. . .below is based on information I got from our law library, the
793 # provincial archives, and the provincial Community Services department.
794 # A precise history would require digging through newspaper archives, and
795 # since you didn't say what you wanted, I didn't bother.
796 #
797 # Saskatchewan is split by a time zone meridian (105W) and over the years
798 # the boundary became pretty ragged as communities near it reevaluated
799 # their affiliations in one direction or the other. In 1965 a provincial
800 # referendum favoured legislating common time practices.
801 #
802 # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
803 # Saskatchewan 1978) was proclaimed, and established that the eastern
804 # part of Saskatchewan would use CST year round, that districts in
805 # northwest Saskatchewan would by default follow CST but could opt to
806 # follow Mountain Time rules (thus 1 hour difference in the winter and
807 # zero in the summer), and that districts in southwest Saskatchewan would
808 # by default follow MT but could opt to follow CST.
809 #
810 # It took a few years for the dust to settle (I know one story of a town
811 # on one time zone having its school in another, such that a mom had to
812 # serve her family lunch in two shifts), but presently it seems that only
813 # a few towns on the border with Alberta (e.g. Lloydminster) follow MT
814 # rules any more; all other districts appear to have used CST year round
815 # since sometime in the 1960s.
817 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
818 Rule Regina 1918 only - Apr 14 2:00 1:00 D
819 Rule Regina 1918 only - Oct 31 2:00 0 S
820 Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
821 Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
822 Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
823 Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
824 Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
825 Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
826 Rule Regina 1942 only - Feb 9 2:00 1:00 D
827 Rule Regina 1945 only - Sep lastSun 2:00 0 S
828 Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
829 Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
830 Rule Regina 1947 1959 - Apr lastSun 2:00 1:00 D
831 Rule Regina 1947 1958 - Sep lastSun 2:00 0 S
832 Rule Regina 1959 only - Oct lastSun 2:00 0 S
833 #
834 Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
835 Rule Swift 1957 only - Oct lastSun 2:00 0 S
836 Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
837 Rule Swift 1959 only - Oct lastSun 2:00 0 S
838 Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
839 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
840 Zone America/Regina -6:58:36 - LMT 1905 Sep
841 -7:00 Regina M%sT 1960 Apr lastSun 2:00
842 -6:00 - CST
843 Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
844 -7:00 Canada M%sT 1946 Apr lastSun 2:00
845 -7:00 Regina M%sT 1950
846 -7:00 Swift M%sT 1972 Apr lastSun 2:00
847 -6:00 - CST
850 # Alberta
852 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
853 Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
854 Rule Edm 1918 only - Oct 31 2:00 0 S
855 Rule Edm 1919 only - May 27 2:00 0 S
856 Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
857 Rule Edm 1920 only - Oct lastSun 2:00 0 S
858 Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
859 Rule Edm 1942 only - Feb 9 2:00 1:00 D
860 Rule Edm 1945 only - Sep lastSun 2:00 0 S
861 Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
862 Rule Edm 1947 only - Sep lastSun 2:00 0 S
863 Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
864 Rule Edm 1967 only - Oct lastSun 2:00 0 S
865 Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
866 Rule Edm 1969 only - Oct lastSun 2:00 0 S
867 Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
868 Rule Edm 1972 max - Oct lastSun 2:00 0 S
869 Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D
870 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
871 Zone America/Edmonton -7:33:52 - LMT 1906 Sep
872 -7:00 Edm M%sT
875 # British Columbia
877 # From Paul Eggert (1996-06-12):
878 # Shanks writes that since 1970 most of this region has been like Vancouver.
879 # Dawson Creek uses MST. Much of east BC is like Edmonton.
881 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
882 Rule Vanc 1918 only - Apr 14 2:00 1:00 D
883 Rule Vanc 1918 only - Oct 31 2:00 0 S
884 Rule Vanc 1942 only - Feb 9 2:00 1:00 D
885 Rule Vanc 1945 only - Sep 30 2:00 0 S
886 Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
887 Rule Vanc 1946 only - Oct 13 2:00 0 S
888 Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
889 Rule Vanc 1962 max - Oct lastSun 2:00 0 S
890 Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D
891 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
892 Zone America/Vancouver -8:12:28 - LMT 1884
893 -8:00 Vanc P%sT
894 Zone America/Dawson_Creek -8:00:56 - LMT 1884
895 -8:00 Canada P%sT 1947
896 -8:00 Vanc P%sT 1972 Aug 30 2:00
897 -7:00 - MST
900 # Northwest Territories, Nunavut, Yukon
902 # From Paul Eggert (1999-10-29):
903 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
904 # Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs:
905 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
906 # c. 7 defines Yukon standard time as UTC-9. This is still valid;
907 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
908 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
909 # * O.I.C. 1980/02 established DST.
910 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
911 # Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander.
913 # From Rives McDow (1999-09-04):
914 # Nunavut ... moved ... to incorporate the whole territory into one time zone.
915 # <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
916 # Nunavut moves to single time zone Oct. 31
917 # </a>
918 #
919 # From Antoine Leca (1999-09-06):
920 # We then need to create a new timezone for the Kitikmeot region of Nunavut
921 # to differentiate it from the Yellowknife region.
923 # From Paul Eggert (1999-09-20):
924 # <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
925 # Basic Facts: The New Territory
926 # </a> (1999) reports that Pangnirtung operates on Eastern time,
927 # and that Coral Harbour does not observe DST. We don't know when
928 # Pangnirtung switched to Eastern time; we'll guess 1995.
929 # We'll ignore the claim about Coral Harbour for now,
930 # since we have no further info.
932 # From Rives McDow (1999-11-08):
933 # On October 31, when the rest of Nunavut went to Central time,
934 # Pangnirtung wobbled. Here is the result of their wobble:
935 #
936 # The following businesses and organizations in Pangnirtung use Central Time:
937 #
938 # First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
939 # Eastern Arctic National Parks, A & D Specialist
940 #
941 # The following businesses and organizations in Pangnirtung use Eastern Time:
942 #
943 # Hamlet office, All other businesses, Both schools, Airport operator
944 #
945 # This has made for an interesting situation there, which warranted the news.
946 # No one there that I spoke with seems concerned, or has plans to
947 # change the local methods of keeping time, as it evidently does not
948 # really interfere with any activities or make things difficult locally.
949 # They plan to celebrate New Year's turn-over twice, one hour apart,
950 # so it appears that the situation will last at least that long.
951 # The Nunavut Intergovernmental Affairs hopes that they will "come to
952 # their senses", but the locals evidently don't see any problem with
953 # the current state of affairs.
955 # From Michaela Rodrigue, writing in the
956 # <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html">
957 # Nunatsiaq News (1999-11-19)</a>:
958 # Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
959 # central - or Nunavut time - for government offices, and eastern time
960 # for municipal offices and schools.... Igloolik [was similar but then]
961 # made the switch to central time on Saturday, Nov. 6.
963 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
964 Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
965 Rule NT_YK 1918 only - Oct 27 2:00 0 S
966 Rule NT_YK 1919 only - May 25 2:00 1:00 D
967 Rule NT_YK 1919 only - Nov 1 0:00 0 S
968 Rule NT_YK 1942 only - Feb 9 2:00 1:00 D
969 Rule NT_YK 1945 only - Sep 30 2:00 0 S
970 Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
971 Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
972 Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
973 Rule NT_YK 1980 max - Oct lastSun 2:00 0 S
974 Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D
975 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
976 Zone America/Pangnirtung -4:22:56 - LMT 1884
977 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
978 -5:00 Canada E%sT 1999 Oct 31 2:00
979 -6:00 Canada C%sT
980 Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987
981 -5:00 NT_YK E%sT 1999 Oct 31 2:00
982 -6:00 Canada C%sT
983 Zone America/Rankin_Inlet -6:08:40 - LMT 1884
984 -6:00 NT_YK C%sT
985 Zone America/Cambridge_Bay -7:00:20 - LMT 1884
986 -7:00 NT_YK M%sT 1999 Oct 31 2:00
987 -6:00 Canada C%sT
988 Zone America/Yellowknife -7:37:24 - LMT 1884
989 -7:00 NT_YK M%sT
990 Zone America/Inuvik -8:54:00 - LMT 1884
991 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
992 -7:00 NT_YK M%sT
993 Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
994 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
995 -8:00 NT_YK P%sT
996 Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
997 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
998 -8:00 NT_YK P%sT
1001 ###############################################################################
1003 # Mexico
1005 # From Guy Harris:
1006 # Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
1007 # Rules [before] 1987 are unknown.
1008 # The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
1009 # observe DST." This is presumably Baja California Norte, above 28th parallel,
1010 # as listed there; [there is also] "Baja California Sur and N. Pacific
1011 # Coast (States of Sinaloa and Sonora)."
1013 # From Bob Devine (1988-01-28):
1014 # The Federal District (where Mexico City is) has observed [DST] several
1015 # times but not recently.
1016 #
1017 # I don't where to draw the line in the North Baja area. 28th latitude
1018 # sounds good -- but it may be higher (how far [d]o radio stations from
1019 # San Diego affect culture?).
1020 #
1021 # The dates of DST probably go back to 1981. The rules are the same as
1022 # US's. This is going to be a headache for US presidential electi[o]n years!
1024 # From Arthur David Olson (1988-02-13)
1025 # Since the 1981 starting date is only "probable," we'll keep the 1987
1026 # starting date below.
1028 # From U. S. Naval Observatory (1989-01-19):
1029 # MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
1030 # MEXICO BAJA CAL N N. PACIFIC COAST (STATES
1031 # MEXICO BAJA CAL N OF SINALOA AND SONORA)
1032 # MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
1033 # MEXICO BAJA CAL N - OCT 29
1034 # MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
1035 # MEXICO BAJA CAL N - 0CT 29
1036 # MEXICO 6 H BEHIND UTC STATES OF DURANGO,
1037 # MEXICO COAHUILA, NUEVO LEON,
1038 # MEXICO TAMAULIPAS
1039 # MEXICO 5 H BEHIND UTC STATES OF DURANGO,
1040 # MEXICO COAHUILA, NUEVO LEON,
1041 # MEXICO TAMAULIPAS APR 3 - OCT 29
1042 # MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
1043 # MEXICO CAMPECHE, QUINTANA ROO AND
1044 # MEXICO YUCATAN
1046 # From Arthur David Olson (1989-01-21):
1047 # April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
1048 # USNO claims there should be four Mexican zones rather than three:
1049 # a zone that's GMT-8 with DST; a zone that's always GMT-7;
1050 # a zone that's GMT-6 with DST; and a zone that's always GMT-6.
1052 # From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
1053 # A guy from our Mexico subsidiary finally found the Presidential Decree
1054 # outlining the timezone changes in Mexico.
1055 #
1056 # ------------- Begin Forwarded Message -------------
1057 #
1058 # I finally got my hands on the Official Presidential Decree that sets up the
1059 # rules for the DST changes. The rules are:
1060 #
1061 # 1. The country is divided in 3 timezones:
1062 # - Baja California Norte (the Mexico/BajaNorte TZ)
1063 # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
1064 # - The rest of the country (the Mexico/General TZ)
1065 #
1066 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
1067 # at 2:00 AM, the times in each zone are as follows:
1068 # BajaNorte: GMT+7
1069 # BajaSur: GMT+6
1070 # General: GMT+5
1071 #
1072 # 3. The rest of the year, the times are as follows:
1073 # BajaNorte: GMT+8
1074 # BajaSur: GMT+7
1075 # General: GMT+6
1076 #
1077 # The Decree was published in Mexico's Official Newspaper on January 4th.
1078 #
1079 # -------------- End Forwarded Message --------------
1080 # From Paul Eggert (1996-06-12):
1081 # For an English translation of the decree, see
1082 # <a href="http://mexico-travel.com/extra/timezone_eng.html">
1083 # ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
1084 # </a>
1086 # From Rives McDow (1998-10-08):
1087 # The State of Quintana Roo has reverted back to central STD and DST times
1088 # (i.e. UTC -0600 and -0500 as of 1998-08-02).
1090 # From Rives McDow (2000-01-10):
1091 # Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
1092 # zone 5 hours from the International Date Line, and will not observe daylight
1093 # savings time so as to stay on the same time zone as the southern part of
1094 # Arizona year round.
1096 # From Shanks:
1097 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1098 Rule Mexico 1939 only - Feb 5 0:00 1:00 D
1099 Rule Mexico 1939 only - Jun 25 0:00 0 S
1100 Rule Mexico 1940 only - Dec 9 0:00 1:00 D
1101 Rule Mexico 1941 only - Apr 1 0:00 0 S
1102 Rule Mexico 1943 only - Dec 16 0:00 1:00 D
1103 Rule Mexico 1944 only - May 1 0:00 0 S
1104 Rule Mexico 1950 only - Feb 12 0:00 1:00 D
1105 Rule Mexico 1950 only - Jul 30 0:00 0 S
1106 Rule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D
1107 Rule Mexico 1996 max - Oct lastSun 2:00 0 S
1108 #
1109 Rule BajaN 1954 1961 - Apr lastSun 2:00 1:00 D
1110 Rule BajaN 1954 1961 - Sep lastSun 2:00 0 S
1111 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1112 # Quintana Roo
1113 Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
1114 -6:00 - CST 1996
1115 -6:00 Mexico C%sT 1997 Oct lastSun 2:00
1116 -5:00 Mexico E%sT 1998 Aug 2 2:00
1117 -6:00 Mexico C%sT
1118 # Central Mexico
1119 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
1120 -7:00 - MST 1927 Jun 10 23:00
1121 -6:00 - CST 1930 Nov 15
1122 -7:00 - MST 1931 May 1 23:00
1123 -6:00 - CST 1931 Oct
1124 -7:00 - MST 1932 Mar 30 23:00
1125 -6:00 Mexico C%sT
1126 # Chihuahua
1127 Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
1128 -7:00 - MST 1927 Jun 10 23:00
1129 -6:00 - CST 1930 Nov 15
1130 -7:00 - MST 1931 May 1 23:00
1131 -6:00 - CST 1931 Oct
1132 -7:00 - MST 1932 Mar 30 23:00
1133 -6:00 - CST 1996
1134 -6:00 Mexico C%sT 1998
1135 -6:00 - CST 1998 Apr Sun>=1 3:00
1136 -7:00 Mexico M%sT
1137 # Sonora
1138 Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
1139 -7:00 - MST 1927 Jun 10 23:00
1140 -6:00 - CST 1930 Nov 15
1141 -7:00 - MST 1931 May 1 23:00
1142 -6:00 - CST 1931 Oct
1143 -7:00 - MST 1932 Mar 30 23:00
1144 -6:00 - CST 1942 Apr
1145 -7:00 - MST 1949 Jan 14
1146 -8:00 - PST 1970
1147 -7:00 Mexico M%sT 1999
1148 -7:00 - MST
1149 # S Baja California, Nayarit, Sinaloa
1150 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
1151 -7:00 - MST 1927 Jun 10 23:00
1152 -6:00 - CST 1930 Nov 15
1153 -7:00 - MST 1931 May 1 23:00
1154 -6:00 - CST 1931 Oct
1155 -7:00 - MST 1932 Mar 30 23:00
1156 -6:00 - CST 1942 Apr
1157 -7:00 - MST 1949 Jan 14
1158 -8:00 - PST 1970
1159 -7:00 Mexico M%sT
1160 # Baja California
1161 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
1162 -8:00 - PST 1927 Jun 10 23:00
1163 -7:00 - MST 1930 Nov 16
1164 -8:00 - PST 1942 Apr
1165 -7:00 - MST 1949 Jan 14
1166 -8:00 BajaN P%sT 1976
1167 -8:00 US P%sT 1996
1168 -8:00 Mexico P%sT
1169 #
1170 # Revillagigedo Is
1171 # no information
1173 ###############################################################################
1175 # Anguilla
1176 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1177 Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
1178 -4:00 - AST
1180 # Antigua and Barbuda
1181 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1182 Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
1183 -5:00 - EST 1951
1184 -4:00 - AST
1186 # Bahamas
1187 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1188 Rule Bahamas 1964 max - Oct lastSun 2:00 0 S
1189 Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D
1190 Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D
1191 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1192 Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
1193 -5:00 Bahamas E%sT
1195 # Barbados
1196 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1197 Rule Barb 1977 only - Jun 12 2:00 1:00 D
1198 Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
1199 Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
1200 Rule Barb 1979 only - Sep 30 2:00 0 S
1201 Rule Barb 1980 only - Sep 25 2:00 0 S
1202 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1203 Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
1204 -3:58:28 - BMT 1932 # Bridgetown Mean Time
1205 -4:00 Barb A%sT
1207 # Belize
1208 # Whitman entirely disagrees with Shanks; go with Shanks.
1209 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1210 Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
1211 Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
1212 Rule Belize 1973 only - Dec 5 0:00 1:00 D
1213 Rule Belize 1974 only - Feb 9 0:00 0 S
1214 Rule Belize 1982 only - Dec 18 0:00 1:00 D
1215 Rule Belize 1983 only - Feb 12 0:00 0 S
1216 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1217 Zone America/Belize -5:52:48 - LMT 1912 Apr
1218 -6:00 Belize C%sT
1220 # Bermuda
1221 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1222 Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
1223 -4:00 - AST 1974 Apr 28 2:00
1224 -4:00 Bahamas A%sT
1226 # Cayman Is
1227 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1228 Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
1229 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1230 -5:00 - EST
1232 # Costa Rica
1233 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1234 Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
1235 Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
1236 Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
1237 # IATA SSIM (1991-09) says the following was at 1:00; go with Shanks.
1238 Rule CR 1991 only - Jul 1 0:00 0 S
1239 Rule CR 1992 only - Mar 15 0:00 0 S
1240 # There are too many San Joses elsewhere, so we'll use `Costa Rica'.
1241 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1242 Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
1243 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time
1244 -6:00 CR C%sT
1245 # Coco
1246 # no information; probably like America/Costa_Rica
1248 # Cuba
1250 # From Arthur David Olson (1999-03-29):
1251 # The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
1252 # the Cuban National Team and the Baltimore Orioles was carried live on
1253 # the Orioles Radio Network, including affiliate WTOP in Washington, DC.
1254 # During the game, play-by-play announcer Jim Hunter noted that
1255 # "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
1256 # Time today." (The "two hour" remark referred to losing one hour of
1257 # sleep on 1999-03-28--when the announcers were in Cuba as it switched
1258 # to DST--and one more hour on 1999-04-04--when the announcers will have
1259 # returned to Baltimore, which switches on that date.)
1261 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1262 Rule Cuba 1928 only - Jun 10 0:00 1:00 D
1263 Rule Cuba 1928 only - Oct 10 0:00 0 S
1264 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
1265 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
1266 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
1267 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
1268 Rule Cuba 1965 only - Jun 1 0:00 1:00 D
1269 Rule Cuba 1965 only - Sep 30 0:00 0 S
1270 Rule Cuba 1966 only - May 29 0:00 1:00 D
1271 Rule Cuba 1966 only - Oct 2 0:00 0 S
1272 Rule Cuba 1967 only - Apr 8 0:00 1:00 D
1273 Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
1274 Rule Cuba 1968 only - Apr 14 0:00 1:00 D
1275 Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
1276 Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
1277 Rule Cuba 1972 1974 - Oct 8 0:00 0 S
1278 Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
1279 Rule Cuba 1978 only - May 7 0:00 1:00 D
1280 Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
1281 Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
1282 Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
1283 Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
1284 Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
1285 Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
1286 Rule Cuba 1996 only - Oct 6 0:00s 0 S
1287 Rule Cuba 1997 only - Oct 12 0:00s 0 S
1288 Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
1289 Rule Cuba 1998 max - Oct lastSun 0:00s 0 S
1290 Rule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D
1292 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1293 Zone America/Havana -5:29:28 - LMT 1890
1294 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
1295 -5:00 Cuba C%sT
1297 # Dominica
1298 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1299 Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
1300 -4:00 - AST
1302 # Dominican Republic
1303 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1304 Rule DR 1966 only - Oct 30 0:00 1:00 D
1305 Rule DR 1967 only - Feb 28 0:00 0 S
1306 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
1307 Rule DR 1970 only - Feb 21 0:00 0 S
1308 Rule DR 1971 only - Jan 20 0:00 0 S
1309 Rule DR 1972 1974 - Jan 21 0:00 0 S
1310 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1311 Zone America/Santo_Domingo -4:39:36 - LMT 1890
1312 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
1313 -5:00 DR E%sT 1974 Oct 27
1314 -4:00 - AST
1316 # El Salvador
1317 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1318 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
1319 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
1320 # There are too many San Salvadors elsewhere, so we'll use `El Salvador'.
1321 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1322 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
1323 -6:00 Salv C%sT
1325 # Grenada
1326 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1327 Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
1328 -4:00 - AST
1330 # Guadeloupe
1331 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1332 Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
1333 -4:00 - AST
1335 # Guatemala
1336 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1337 Rule Guat 1973 only - Nov 25 0:00 1:00 D
1338 Rule Guat 1974 only - Feb 24 0:00 0 S
1339 Rule Guat 1983 only - May 21 0:00 1:00 D
1340 Rule Guat 1983 only - Sep 22 0:00 0 S
1341 Rule Guat 1991 only - Mar 23 0:00 1:00 D
1342 Rule Guat 1991 only - Sep 7 0:00 0 S
1343 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1344 Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
1345 -6:00 Guat C%sT
1347 # Haiti
1348 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1349 Rule Haiti 1983 only - May 8 0:00 1:00 D
1350 Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
1351 Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
1352 # Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA.
1353 Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
1354 Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
1355 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1356 Zone America/Port-au-Prince -4:49:20 - LMT 1890
1357 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
1358 -5:00 Haiti E%sT
1360 # Honduras
1361 # Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1.
1362 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1363 Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
1364 -6:00 Salv C%sT
1365 #
1366 # Great Swan I ceded by US to Honduras in 1972
1368 # Jamaica
1370 # From Bob Devine (1988-01-28):
1371 # Follows US rules.
1373 # From U. S. Naval Observatory (1989-01-19):
1374 # JAMAICA 5 H BEHIND UTC
1376 # From Shanks:
1377 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1378 Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
1379 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1380 -5:00 - EST 1974 Apr 28 2:00
1381 -5:00 US E%sT 1984
1382 -5:00 - EST
1384 # Martinique
1385 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1386 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
1387 -4:04 - FFMT 1911 May # Fort-de-France MT
1388 -4:00 - AST 1980 Apr 6
1389 -4:00 1:00 ADT 1980 Sep 28
1390 -4:00 - AST
1392 # Montserrat
1393 # From Paul Eggert (1997-08-31):
1394 # Recent volcanic eruptions have forced evacuation of Plymouth, the capital.
1395 # Luckily, Olveston, the current de facto capital, has the same longitude.
1396 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1397 Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston
1398 -4:00 - AST
1400 # Nicaragua
1401 #
1402 # From Steffen Thorsen (1998-12-29):
1403 # Nicaragua seems to be back at -6:00 but I have not been able to find when
1404 # they changed from -5:00.
1405 #
1406 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1407 Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
1408 Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
1409 Rule Nic 1992 only - Jan 1 4:00 1:00 D
1410 Rule Nic 1992 only - Sep 24 0:00 0 S
1411 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1412 Zone America/Managua -5:45:08 - LMT 1890
1413 -5:45 - MMT 1934 Jun 23 # Managua Mean Time
1414 -6:00 - CST 1973 May
1415 -5:00 - EST 1975 Feb 16
1416 -6:00 Nic C%sT 1993 Jan 1 4:00
1417 -5:00 - EST 1998 Dec
1418 -6:00 - CST
1420 # Panama
1421 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1422 Zone America/Panama -5:18:08 - LMT 1890
1423 -5:20 - PMT 1908 Apr 22 # Panama Mean Time
1424 -5:00 - EST
1426 # Puerto Rico
1427 # There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
1428 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1429 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
1430 -4:00 - AST 1942 May 3
1431 -4:00 1:00 AWT 1945 Sep 30 2:00
1432 -4:00 - AST
1434 # St Kitts-Nevis
1435 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1436 Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
1437 -4:00 - AST
1439 # St Lucia
1440 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1441 Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
1442 -4:04 - CMT 1912 # Castries Mean Time
1443 -4:00 - AST
1445 # St Pierre and Miquelon
1446 # There are too many St Pierres elsewhere, so we'll use `Miquelon'.
1447 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1448 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
1449 -4:00 - AST 1980 May
1450 -3:00 Mont PM%sT # Pierre & Miquelon Time
1452 # St Vincent and the Grenadines
1453 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1454 Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
1455 -4:04:56 - KMT 1912 # Kingstown Mean Time
1456 -4:00 - AST
1458 # Turks and Caicos
1459 # From Paul Eggert (1998-08-06):
1460 # Shanks says they use US DST rules, but IATA SSIM (1991/1998)
1461 # says they switch at midnight. Go with IATA SSIM.
1462 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1463 Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D
1464 Rule TC 1979 max - Oct lastSun 0:00 0 S
1465 Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D
1466 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1467 Zone America/Grand_Turk -4:44:32 - LMT 1890
1468 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1469 -5:00 TC E%sT
1471 # British Virgin Is
1472 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1473 Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
1474 -4:00 - AST
1476 # Virgin Is
1477 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1478 Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
1479 -4:00 - AST