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Annotation of 43BSDTahoe/etc/tzone/northamerica, revision 1.1

1.1     ! root        1: # northamerica
        !             2: 
        !             3: # Despite the performance of existing (4.[123]BSD, System V Release 2.0) code,
        !             4: # US Daylight Saving Time ended on the last Sunday of *October* in 1974.
        !             5: # See, for example, the front page of the Saturday, October 26, 1974
        !             6: # and Sunday, October 27, 1974 editions of the Washington Post.
        !             7: 
        !             8: # Note also this from seismo!munnari!kre:
        !             9: # "I recall also being told by someone once that Canada didn't have
        !            10: # the DST variations in 74/75 that the US did, but I am not nearly
        !            11: # sure enough of this to add anything."
        !            12: # The above has been confirmed by Bob Devine; we'll go with it here.
        !            13: 
        !            14: # Before the Uniform Time Act of 1966 took effect in 1967, observance of
        !            15: # Daylight Saving Time in the US was by local option, except during wartime.
        !            16: 
        !            17: # Rule NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
        !            18: Rule   US      1918    1919    -       Mar     lastSun 2:00    1:00    D
        !            19: Rule   US      1918    1919    -       Oct     lastSun 2:00    0       S
        !            20: Rule   US      1942    only    -       Feb     9       2:00    1:00    W # War
        !            21: Rule   US      1945    only    -       Sep     30      2:00    0       S
        !            22: Rule   US      1967    max     -       Oct     lastSun 2:00    0       S
        !            23: Rule   US      1967    1973    -       Apr     lastSun 2:00    1:00    D
        !            24: Rule   US      1974    only    -       Jan     6       2:00    1:00    D
        !            25: Rule   US      1975    only    -       Feb     23      2:00    1:00    D
        !            26: Rule   US      1976    1986    -       Apr     lastSun 2:00    1:00    D
        !            27: Rule   US      1987    max     -       Apr     Sun>=1  2:00    1:00    D
        !            28: 
        !            29: ###############################################################################
        !            30: 
        !            31: # New names
        !            32: 
        !            33: # Zone NAME            GMTOFF  RULES/SAVE      FORMAT   [UNTIL]
        !            34: Zone   US/Eastern      -5:00   US              E%sT
        !            35: Zone   US/Central      -6:00   US              C%sT
        !            36: Zone   US/Mountain     -7:00   US              M%sT
        !            37: Zone   US/Pacific      -8:00   US              P%sT
        !            38: Zone   US/Yukon        -9:00   US              Y%sT
        !            39: 
        !            40: # Mainland US areas that are always Standard as of 1986.
        !            41: 
        !            42: Zone   US/East-Indiana -5:00   US      E%sT    1946
        !            43:                        -5:00   -       EST             # Always EST as of 1986
        !            44: Zone   US/Arizona      -7:00   US      M%sT    1946
        !            45:                        -7:00   -       MST             # Always MST as of 1986
        !            46: 
        !            47: # And then there's Hawaii.
        !            48: # DST was observed for one day in 1933;
        !            49: # Standard time was change by half an hour in 1947;
        !            50: # it's always standard as of 1986.
        !            51: 
        !            52: Zone   US/Hawaii       -10:30  US      H%sT    1933 Apr 30 2:00
        !            53:                        -10:30  1:00    HDT     1933 May 1 2:00
        !            54:                        -10:30  US      H%sT    1947 Jun 8 2:00
        !            55:                        -10:00  -       HST
        !            56: 
        !            57: # Old names, for S5 users
        !            58: 
        !            59: # Link LINK-FROM       LINK-TO
        !            60: Link   US/Eastern      EST5EDT
        !            61: Link   US/Central      CST6CDT
        !            62: Link   US/Mountain     MST7MDT
        !            63: Link   US/Pacific      PST8PDT
        !            64: Link   US/East-Indiana EST
        !            65: Link   US/Arizona      MST
        !            66: Link   US/Hawaii       HST
        !            67: 
        !            68: ################################################################################
        !            69: 
        !            70: # Canada is reportedly lots easier than the US--leastways since 1951.
        !            71: # I don't know what they did before then.
        !            72: # 4.3BSD claims that it's perfectly regular.
        !            73: # According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc.
        !            74: # on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada,
        !            75: # "...Canada (well, Ontario and at least some of the other provinces) are
        !            76: # adopting the new daylight savings time rules...".  We assume all of
        !            77: # Canada is doing so.
        !            78: 
        !            79: # Rule NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
        !            80: Rule   Canada  1969    max     -       Oct     lastSun 2:00    0       S
        !            81: Rule   Canada  1969    1986    -       Apr     lastSun 2:00    1:00    D
        !            82: Rule   Canada  1987    max     -       Apr     Sun>=1  2:00    1:00    D
        !            83: 
        !            84: # Zone NAME                    GMTOFF  RULES/SAVE      FORMAT  [UNTIL]
        !            85: # Bob Devine says that DST *is* observed in Newfoundland
        !            86: Zone   Canada/Newfoundland     -3:30   Canada          N%sT
        !            87: Zone   Canada/Atlantic         -4:00   Canada          A%sT
        !            88: Zone   Canada/Eastern          -5:00   Canada          E%sT
        !            89: Zone   Canada/Central          -6:00   Canada          C%sT
        !            90: Zone   Canada/East-Saskatchewan        -6:00   -       CST # No DST as of 1987
        !            91: Zone   Canada/Mountain         -7:00   Canada          M%sT
        !            92: Zone   Canada/Pacific          -8:00   Canada          P%sT
        !            93: Zone   Canada/Yukon            -9:00   Canada          Y%sT
        !            94: 
        !            95: ################################################################################
        !            96: 
        !            97: # Mexico
        !            98: # Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
        !            99: # Rules prior to 1987 are unknown.
        !           100: # The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
        !           101: # observe DST".  This is presumably Baja California Norte, above 28th parallel,
        !           102: # as listed there; Mexico/BajaSur is for "Baja California Sur and N. Pacific
        !           103: # Coast (States of Sinaloa and Sonora)".
        !           104: 
        !           105: # Rule NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
        !           106: Rule   Mexico  1987    max     -       Oct     lastSun 2:00    0       S
        !           107: Rule   Mexico  1987    max     -       Apr     Sun>=1  2:00    1:00    D
        !           108: 
        !           109: # Zone NAME                    GMTOFF  RULES/SAVE      FORMAT  [UNTIL]
        !           110: Zone   Mexico/BajaNorte        -8:00   Mexico          P%sT
        !           111: Zone   Mexico/BajaSur          -7:00   -               MST
        !           112: Zone   Mexico/General          -6:00   -               CST

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