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- # @(#)northamerica 4.8
-
- ###############################################################################
-
- # United States
-
- # From Arthur David Olson:
- # US Daylight Saving Time ended on the last Sunday of *October* in 1974.
- # See, for example, the front page of the Saturday, October 26, 1974
- # and Sunday, October 27, 1974 editions of the Washington Post.
-
- # From seismo!munnari!kre:
- # I recall also being told by someone once that Canada didn't have
- # the DST variations in 74/75 that the US did, but I am not nearly
- # sure enough of this to add anything.
-
- # From Arthur David Olson:
- # The above has been confirmed by Bob Devine; we'll go with it here.
-
- # From Arthur David Olson:
- # Before the Uniform Time Act of 1966 took effect in 1967, observance of
- # Daylight Saving Time in the US was by local option, except during wartime.
-
- # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
- Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
- Rule US 1918 1919 - Oct lastSun 2:00 0 S
- Rule US 1942 only - Feb 9 2:00 1:00 W # War
- Rule US 1945 only - Sep 30 2:00 0 S
- Rule US 1967 max - Oct lastSun 2:00 0 S
- Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
- Rule US 1974 only - Jan 6 2:00 1:00 D
- Rule US 1975 only - Feb 23 2:00 1:00 D
- Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
- Rule US 1987 max - Apr Sun>=1 2:00 1:00 D
-
- # From Bob Devine (January 28, 1988):
- # ...Alaska (and Hawaii) had the timezone names changed in 1967.
- # old new
- # Pacific Standard Time(PST) -same-
- # Yukon Standard Time(YST) -same-
- # Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
- # Nome Standard Time (NT) Bering Standard Time (BST)
- #
- # ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
- # The YST zone now covers nearly all of the state, AHST just part
- # of the Aleutian islands. No DST.
-
- # From U. S. Naval Observatory (January 19, 1989):
- # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
- # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
- # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
- # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
- # USA MOUNTAIN 7 H BEHIND UTC DENVER
- # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
- # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
- # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
- # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
- # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
- # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
- # USA - " - 9 H BEHIND UTC APR 3 - OCT 30
- # USA HAWAII 10 H BEHIND UTC
- # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
-
- # From Arthur David Olson (January 21, 1989):
- # The above dates are for 1988.
- # Note the "AKST" and "AKDT" abbreviations, the claim that there's
- # no DST in Samoa, and the claim that there is DST in Alaska and the
- # Aleutians.
-
- # From Arthur David Olson (February 13, 1988):
- # Legal standard time zone names, from United States Code (1982 Edition and
- # Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
- # up to April 1, 1967 (when most provisions of the Uniform Time Act of 1966
- # took effect), as explained in sections 263 and 261:
- # (none)
- # United States standard eastern time
- # United States standard mountain time
- # United States standard central time
- # United States standard Pacific time
- # (none)
- # United States standard Alaska time
- # (none)
- # Next, names from April 1, 1967 until November 30, 1983 (the date for
- # public law 98-181):
- # Atlantic standard time
- # eastern standard time
- # central standard time
- # mountain standard time
- # Pacific standard time
- # Yukon standard time
- # Alaska-Hawaii standard time
- # Bering standard time
- # And after November 30, 1983:
- # Atlantic standard time
- # eastern standard time
- # central standard time
- # mountain standard time
- # Pacific standard time
- # Alaska standard time
- # Hawaii-Aleutian standard time
- # Samoa standard time
- # The law doesn't give abbreviations.
-
- # Easy stuff first--including Alaska, where we ignore history (since we
- # can't tell if we should give Yukon time or Alaska-Hawaii time for "old"
- # times).
-
- # Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
- Zone US/Eastern -5:00 US E%sT
- Zone US/Central -6:00 US C%sT
- Zone US/Mountain -7:00 US M%sT
- Zone US/Pacific -8:00 US P%sT
- Zone US/Alaska -9:00 US AK%sT # Abbreviation per USNO
-
- # Mainland US areas that are always Standard as of 1986.
-
- Zone US/East-Indiana -5:00 US E%sT 1946
- -5:00 - EST # Always EST as of 1986
- Zone US/Arizona -7:00 US M%sT 1946
- -7:00 - MST # Always MST as of 1986
-
- # From Arthur David Olson (February 13, 1988):
- # However. . .a writer from the Inter Tribal Council of Arizona, Inc.,
- # notes in private correspondence dated 12/28/87 that "Presently, only the
- # Navajo Nation participates in the Daylight Saving Time policy, due to its
- # large size and location in three states." (The "only" means that other
- # tribal nations don't use DST.)
-
- Link US/Mountain Navajo
-
- # From Bob Devine (January 28, 1988):
- # Michigan didn't observe DST from 1968 to 1973.
-
- Zone US/Michigan -5:00 US E%sT 1968
- -5:00 - EST 1973
- -5:00 US E%sT
-
- # Samoa just changes names. No DST, per Naval Observatory.
-
- Zone US/Samoa -11:00 - NST 1967 Apr 1 # N=Nome
- -11:00 - BST 1983 Nov 30 # B=Bering
- -11:00 - SST # S=Samoa
-
- # Aleutian has a name change. DST, per Naval Observatory.
-
- Zone US/Aleutian -10:00 US AH%sT 1983 Nov 30
- -10:00 US HA%sT
-
- # From Arthur David Olson:
- # And then there's Hawaii.
- # DST was observed for one day in 1933;
- # Standard time was change by half an hour in 1947;
- # it's always standard as of 1986.
-
- Zone US/Hawaii -10:30 US H%sT 1933 Apr 30 2:00
- -10:30 1:00 HDT 1933 May 1 2:00
- -10:30 US H%sT 1947 Jun 8 2:00
- -10:00 - HST
-
- # Old names, for S5 users
-
- # Link LINK-FROM LINK-TO
- # Link US/Eastern EST5EDT
- # Link US/Central CST6CDT
- # Link US/Mountain MST7MDT
- # Link US/Pacific PST8PDT
- # Link US/East-Indiana EST
- # Link US/Arizona MST
- # Link US/Hawaii HST
-
- ################################################################################
-
- # Canada
-
- # Canada is reportedly lots easier than the US--leastways since 1951.
- # I don't know what they did before then.
- # 4.3BSD claims that it's perfectly regular.
- # According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc.
- # on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada,
- # "...Canada (well, Ontario and at least some of the other provinces) are
- # adopting the new daylight savings time rules...". We assume all of
- # Canada is doing so.
-
- # From Bob Devine (January 28, 1988):
- # All of Canada did have DST from your first rule except Saskatchewan.
- # Which parts did not observe DST is hard to pinpoint but most of the
- # province follows the rules.
- # NOTE: those that didn't have DST for that rule, also
- # probably did not have it for several years previous.
-
- # From U. S. Naval Observatory (January 19, 1989):
- # CANADA NEW FDL 3.5H BEHIND UTC ST.JOHN'S
- # CANADA NEW FDL 1.5H BEHIND UTC APR 3 - OCT 29
- # CANADA ATLANTIC 4 H BEHIND UTC HALIFAX
- # CANADA ATLANTIC 3 H BEHIND UTC APR 3 - OCT 29
- # CANADA EASTERN 5 H BEHIND UTC TORONTO, MONTREAL, OTTAWA
- # CANADA EASTERN 4 H BEHIND UTC APR 3 - OCT 29
- # CANADA CENTRAL 6 H BEHIND UTC REGINA, WINNIPEG
- # CANADA CENTRAL 5 H BEHIND UTC APR 3 - OCT 29
- # CANADA MOUNTAIN 7 H BEHIND UTC CALGARY, EDMONTON
- # CANADA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 29
- # CANADA PACIFIC 8 H BEHIND UTC VANCOUVER
- # CANADA PACIFIC 7 H BEHIND UTC APR 3 - OCT 29
- # CANADA YUKON SAME AS PACIFIC DAWSON
-
- # From Arthur David Olson (January 21, 1989):
- # April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
- # Note claim that there's double DST in Newfoundland and that Yukon should
- # be same as Pacific. Stick with rules posted in 1988 until more authoritative
- # information is available.
-
- # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
- Rule Canada 1969 max - Oct lastSun 2:00 0 S
- Rule Canada 1969 1986 - Apr lastSun 2:00 1:00 D
- Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D
-
- # Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
- # Bob Devine says that DST *is* observed in Newfoundland
- Zone Canada/Newfoundland -3:30 Canada N%sT
- Zone Canada/Atlantic -4:00 Canada A%sT
- Zone Canada/Eastern -5:00 Canada E%sT
- Zone Canada/Central -6:00 Canada C%sT
- Zone Canada/East-Saskatchewan -6:00 - CST # No DST as of 1987
- Zone Canada/Mountain -7:00 Canada M%sT
- Zone Canada/Pacific -8:00 Canada P%sT
- Zone Canada/Yukon -9:00 Canada Y%sT
-
- ###############################################################################
-
- # Mexico
-
- # From Guy Harris:
- # Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
- # Rules prior to 1987 are unknown.
- # The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
- # observe DST." This is presumably Baja California Norte, above 28th parallel,
- # as listed there; Mexico/BajaSur is for "Baja California Sur and N. Pacific
- # Coast (States of Sinaloa and Sonora)."
-
- # From Bob Devine (January 28, 1988):
- # The Federal District (where Mexico City is) has observed [DST] several
- # times but not recently.
- #
- # I don't where to drawn the line in the North Baja area. 28th latitude
- # sounds good -- but it may be higher (how far [d]o radio stations from
- # San Diego affect culture?).
- #
- # The dates of DST probably go back to 1981. The rules are the same as
- # US's. This is going to be a headache for US presidential electi[o]n years!
-
- # From Arthur David Olson (February 13, 1988)
- # Since the 1981 starting date is only "probable," we'll keep the 1987
- # starting date below.
-
- # From U. S. Naval Observatory (January 19, 1989):
- # MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
- # MEXICO BAJA CAL N N. PACIFIC COAST (STATES
- # MEXICO BAJA CAL N OF SINALOA AND SONORA)
- # MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLAL APR 3
- # MEXICO BAJA CAL N - OCT 29
- # MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLAL APR 3
- # MEXICO BAJA CAL N - 0CT 29
- # MEXICO 6 H BEHIND UTC STATES OF DURANGO,
- # MEXICO COAHUILA, NUEVO LEON,
- # MEXICO TAMAULIPAS
- # MEXICO 5 H BEHIND UTC STATES OF DURANGO,
- # MEXICO COAHUILA, NUEVO LEON,
- # MEXICO TAMAULIPAS APR 3 - OCT 29
- # MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
- # MEXICO CAMPECHE, QUINTANA ROO AND
- # MEXICO YUCATAN
-
- # From Arthur David Olson (January 21, 1989):
- # April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
- # USNO claims there should be four Mexican zones rather than three:
- # a zone that's GMT-8 with DST; a zone that's always GMT-7;
- # a zone that's GMT-6 with DST; and a zone that's always GMT-6.
- # Wait for more authoritative information before changing.
-
- # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
- Rule Mexico 1987 max - Oct lastSun 2:00 0 S
- Rule Mexico 1987 max - Apr Sun>=1 2:00 1:00 D
-
- # Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
- Zone Mexico/BajaNorte -8:00 Mexico P%sT
- Zone Mexico/BajaSur -7:00 - MST
- Zone Mexico/General -6:00 - CST
-
- ###############################################################################
-
- # Jamaica
-
- # From Bob Devine (January 28, 1988):
- # Follows US rules.
-
- # From U. S. Naval Observatory (January 19, 1989):
- # JAMAICA 5 H BEHIND UTC
-
- Link US/Eastern Jamaica
-
- ###############################################################################
-
- # Cuba
-
- # From Bob Devine (January 28, 1988):
- # . . .DST is from 2nd Sunday in May to 2nd Sunday in October since 1981.
- # Change at midnight. In 1979 & 1980, started at 3rd Sunday in March
- # (I think).
-
- # From U. S. Naval Observatory (January 19, 1989):
- # CUBA 5 H BEHIND UTC
- # CUBA 4 H BEHIND UTC MAR 20 - OCT 8
-
- # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
- Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
- Rule Cuba 1979 1980 - Oct Sun>=8 0:00 0 S
- Rule Cuba 1981 max - May Sun>=8 0:00 1:00 D
- Rule Cuba 1981 max - Oct Sun>=8 0:00 0 S
-
- # Zone NAME GMTOFF RULES/SAVE FORMAT
- Zone Cuba -5:00 Cuba C%sT
-