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1.1 root 1: # @(#)northamerica 4.8
2:
3: ###############################################################################
4:
5: # United States
6:
7: # From Arthur David Olson:
8: # US Daylight Saving Time ended on the last Sunday of *October* in 1974.
9: # See, for example, the front page of the Saturday, October 26, 1974
10: # and Sunday, October 27, 1974 editions of the Washington Post.
11:
12: # From seismo!munnari!kre:
13: # I recall also being told by someone once that Canada didn't have
14: # the DST variations in 74/75 that the US did, but I am not nearly
15: # sure enough of this to add anything.
16:
17: # From Arthur David Olson:
18: # The above has been confirmed by Bob Devine; we'll go with it here.
19:
20: # From Arthur David Olson:
21: # Before the Uniform Time Act of 1966 took effect in 1967, observance of
22: # Daylight Saving Time in the US was by local option, except during wartime.
23:
24: # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
25: Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
26: Rule US 1918 1919 - Oct lastSun 2:00 0 S
27: Rule US 1942 only - Feb 9 2:00 1:00 W # War
28: Rule US 1945 only - Sep 30 2:00 0 S
29: Rule US 1967 max - Oct lastSun 2:00 0 S
30: Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
31: Rule US 1974 only - Jan 6 2:00 1:00 D
32: Rule US 1975 only - Feb 23 2:00 1:00 D
33: Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
34: Rule US 1987 max - Apr Sun>=1 2:00 1:00 D
35:
36: # From Bob Devine (January 28, 1988):
37: # ...Alaska (and Hawaii) had the timezone names changed in 1967.
38: # old new
39: # Pacific Standard Time(PST) -same-
40: # Yukon Standard Time(YST) -same-
41: # Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
42: # Nome Standard Time (NT) Bering Standard Time (BST)
43: #
44: # ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
45: # The YST zone now covers nearly all of the state, AHST just part
46: # of the Aleutian islands. No DST.
47:
48: # From U. S. Naval Observatory (January 19, 1989):
49: # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
50: # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
51: # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
52: # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
53: # USA MOUNTAIN 7 H BEHIND UTC DENVER
54: # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
55: # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
56: # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
57: # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
58: # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
59: # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
60: # USA - " - 9 H BEHIND UTC APR 3 - OCT 30
61: # USA HAWAII 10 H BEHIND UTC
62: # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
63:
64: # From Arthur David Olson (January 21, 1989):
65: # The above dates are for 1988.
66: # Note the "AKST" and "AKDT" abbreviations, the claim that there's
67: # no DST in Samoa, and the claim that there is DST in Alaska and the
68: # Aleutians.
69:
70: # From Arthur David Olson (February 13, 1988):
71: # Legal standard time zone names, from United States Code (1982 Edition and
72: # Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
73: # up to April 1, 1967 (when most provisions of the Uniform Time Act of 1966
74: # took effect), as explained in sections 263 and 261:
75: # (none)
76: # United States standard eastern time
77: # United States standard mountain time
78: # United States standard central time
79: # United States standard Pacific time
80: # (none)
81: # United States standard Alaska time
82: # (none)
83: # Next, names from April 1, 1967 until November 30, 1983 (the date for
84: # public law 98-181):
85: # Atlantic standard time
86: # eastern standard time
87: # central standard time
88: # mountain standard time
89: # Pacific standard time
90: # Yukon standard time
91: # Alaska-Hawaii standard time
92: # Bering standard time
93: # And after November 30, 1983:
94: # Atlantic standard time
95: # eastern standard time
96: # central standard time
97: # mountain standard time
98: # Pacific standard time
99: # Alaska standard time
100: # Hawaii-Aleutian standard time
101: # Samoa standard time
102: # The law doesn't give abbreviations.
103:
104: # Easy stuff first--including Alaska, where we ignore history (since we
105: # can't tell if we should give Yukon time or Alaska-Hawaii time for "old"
106: # times).
107:
108: # Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
109: Zone US/Eastern -5:00 US E%sT
110: Zone US/Central -6:00 US C%sT
111: Zone US/Mountain -7:00 US M%sT
112: Zone US/Pacific -8:00 US P%sT
113: Zone US/Alaska -9:00 US AK%sT # Abbreviation per USNO
114:
115: # Mainland US areas that are always Standard as of 1986.
116:
117: Zone US/East-Indiana -5:00 US E%sT 1946
118: -5:00 - EST # Always EST as of 1986
119: Zone US/Arizona -7:00 US M%sT 1946
120: -7:00 - MST # Always MST as of 1986
121:
122: # From Arthur David Olson (February 13, 1988):
123: # However. . .a writer from the Inter Tribal Council of Arizona, Inc.,
124: # notes in private correspondence dated 12/28/87 that "Presently, only the
125: # Navajo Nation participates in the Daylight Saving Time policy, due to its
126: # large size and location in three states." (The "only" means that other
127: # tribal nations don't use DST.)
128:
129: Link US/Mountain Navajo
130:
131: # From Bob Devine (January 28, 1988):
132: # Michigan didn't observe DST from 1968 to 1973.
133:
134: Zone US/Michigan -5:00 US E%sT 1968
135: -5:00 - EST 1973
136: -5:00 US E%sT
137:
138: # Samoa just changes names. No DST, per Naval Observatory.
139:
140: Zone US/Samoa -11:00 - NST 1967 Apr 1 # N=Nome
141: -11:00 - BST 1983 Nov 30 # B=Bering
142: -11:00 - SST # S=Samoa
143:
144: # Aleutian has a name change. DST, per Naval Observatory.
145:
146: Zone US/Aleutian -10:00 US AH%sT 1983 Nov 30
147: -10:00 US HA%sT
148:
149: # From Arthur David Olson:
150: # And then there's Hawaii.
151: # DST was observed for one day in 1933;
152: # Standard time was change by half an hour in 1947;
153: # it's always standard as of 1986.
154:
155: Zone US/Hawaii -10:30 US H%sT 1933 Apr 30 2:00
156: -10:30 1:00 HDT 1933 May 1 2:00
157: -10:30 US H%sT 1947 Jun 8 2:00
158: -10:00 - HST
159:
160: # Old names, for S5 users
161:
162: # Link LINK-FROM LINK-TO
163: # Link US/Eastern EST5EDT
164: # Link US/Central CST6CDT
165: # Link US/Mountain MST7MDT
166: # Link US/Pacific PST8PDT
167: # Link US/East-Indiana EST
168: # Link US/Arizona MST
169: # Link US/Hawaii HST
170:
171: ################################################################################
172:
173: # Canada
174:
175: # Canada is reportedly lots easier than the US--leastways since 1951.
176: # I don't know what they did before then.
177: # 4.3BSD claims that it's perfectly regular.
178: # According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc.
179: # on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada,
180: # "...Canada (well, Ontario and at least some of the other provinces) are
181: # adopting the new daylight savings time rules...". We assume all of
182: # Canada is doing so.
183:
184: # From Bob Devine (January 28, 1988):
185: # All of Canada did have DST from your first rule except Saskatchewan.
186: # Which parts did not observe DST is hard to pinpoint but most of the
187: # province follows the rules.
188: # NOTE: those that didn't have DST for that rule, also
189: # probably did not have it for several years previous.
190:
191: # From U. S. Naval Observatory (January 19, 1989):
192: # CANADA NEW FDL 3.5H BEHIND UTC ST.JOHN'S
193: # CANADA NEW FDL 1.5H BEHIND UTC APR 3 - OCT 29
194: # CANADA ATLANTIC 4 H BEHIND UTC HALIFAX
195: # CANADA ATLANTIC 3 H BEHIND UTC APR 3 - OCT 29
196: # CANADA EASTERN 5 H BEHIND UTC TORONTO, MONTREAL, OTTAWA
197: # CANADA EASTERN 4 H BEHIND UTC APR 3 - OCT 29
198: # CANADA CENTRAL 6 H BEHIND UTC REGINA, WINNIPEG
199: # CANADA CENTRAL 5 H BEHIND UTC APR 3 - OCT 29
200: # CANADA MOUNTAIN 7 H BEHIND UTC CALGARY, EDMONTON
201: # CANADA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 29
202: # CANADA PACIFIC 8 H BEHIND UTC VANCOUVER
203: # CANADA PACIFIC 7 H BEHIND UTC APR 3 - OCT 29
204: # CANADA YUKON SAME AS PACIFIC DAWSON
205:
206: # From Arthur David Olson (January 21, 1989):
207: # April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
208: # Note claim that there's double DST in Newfoundland and that Yukon should
209: # be same as Pacific. Stick with rules posted in 1988 until more authoritative
210: # information is available.
211:
212: # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
213: Rule Canada 1969 max - Oct lastSun 2:00 0 S
214: Rule Canada 1969 1986 - Apr lastSun 2:00 1:00 D
215: Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D
216:
217: # Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
218: # Bob Devine says that DST *is* observed in Newfoundland
219: Zone Canada/Newfoundland -3:30 Canada N%sT
220: Zone Canada/Atlantic -4:00 Canada A%sT
221: Zone Canada/Eastern -5:00 Canada E%sT
222: Zone Canada/Central -6:00 Canada C%sT
223: Zone Canada/East-Saskatchewan -6:00 - CST # No DST as of 1987
224: Zone Canada/Mountain -7:00 Canada M%sT
225: Zone Canada/Pacific -8:00 Canada P%sT
226: Zone Canada/Yukon -9:00 Canada Y%sT
227:
228: ###############################################################################
229:
230: # Mexico
231:
232: # From Guy Harris:
233: # Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
234: # Rules prior to 1987 are unknown.
235: # The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
236: # observe DST." This is presumably Baja California Norte, above 28th parallel,
237: # as listed there; Mexico/BajaSur is for "Baja California Sur and N. Pacific
238: # Coast (States of Sinaloa and Sonora)."
239:
240: # From Bob Devine (January 28, 1988):
241: # The Federal District (where Mexico City is) has observed [DST] several
242: # times but not recently.
243: #
244: # I don't where to drawn the line in the North Baja area. 28th latitude
245: # sounds good -- but it may be higher (how far [d]o radio stations from
246: # San Diego affect culture?).
247: #
248: # The dates of DST probably go back to 1981. The rules are the same as
249: # US's. This is going to be a headache for US presidential electi[o]n years!
250:
251: # From Arthur David Olson (February 13, 1988)
252: # Since the 1981 starting date is only "probable," we'll keep the 1987
253: # starting date below.
254:
255: # From U. S. Naval Observatory (January 19, 1989):
256: # MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
257: # MEXICO BAJA CAL N N. PACIFIC COAST (STATES
258: # MEXICO BAJA CAL N OF SINALOA AND SONORA)
259: # MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLAL APR 3
260: # MEXICO BAJA CAL N - OCT 29
261: # MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL APR 3
262: # MEXICO BAJA CAL N - 0CT 29
263: # MEXICO 6 H BEHIND UTC STATES OF DURANGO,
264: # MEXICO COAHUILA, NUEVO LEON,
265: # MEXICO TAMAULIPAS
266: # MEXICO 5 H BEHIND UTC STATES OF DURANGO,
267: # MEXICO COAHUILA, NUEVO LEON,
268: # MEXICO TAMAULIPAS APR 3 - OCT 29
269: # MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
270: # MEXICO CAMPECHE, QUINTANA ROO AND
271: # MEXICO YUCATAN
272:
273: # From Arthur David Olson (January 21, 1989):
274: # April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
275: # USNO claims there should be four Mexican zones rather than three:
276: # a zone that's GMT-8 with DST; a zone that's always GMT-7;
277: # a zone that's GMT-6 with DST; and a zone that's always GMT-6.
278: # Wait for more authoritative information before changing.
279:
280: # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
281: Rule Mexico 1987 max - Oct lastSun 2:00 0 S
282: Rule Mexico 1987 max - Apr Sun>=1 2:00 1:00 D
283:
284: # Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
285: Zone Mexico/BajaNorte -8:00 Mexico P%sT
286: Zone Mexico/BajaSur -7:00 - MST
287: Zone Mexico/General -6:00 - CST
288:
289: ###############################################################################
290:
291: # Jamaica
292:
293: # From Bob Devine (January 28, 1988):
294: # Follows US rules.
295:
296: # From U. S. Naval Observatory (January 19, 1989):
297: # JAMAICA 5 H BEHIND UTC
298:
299: Link US/Eastern Jamaica
300:
301: ###############################################################################
302:
303: # Cuba
304:
305: # From Bob Devine (January 28, 1988):
306: # . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981.
307: # Change at midnight. In 1979 & 1980, started at 3rd Sunday in March
308: # (I think).
309:
310: # From U. S. Naval Observatory (January 19, 1989):
311: # CUBA 5 H BEHIND UTC
312: # CUBA 4 H BEHIND UTC MAR 20 - OCT 8
313:
314: # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
315: Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
316: Rule Cuba 1979 1980 - Oct Sun>=8 0:00 0 S
317: Rule Cuba 1981 max - May Sun>=8 0:00 1:00 D
318: Rule Cuba 1981 max - Oct Sun>=8 0:00 0 S
319:
320: # Zone NAME GMTOFF RULES/SAVE FORMAT
321: Zone Cuba -5:00 Cuba C%sT
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