Return to northamerica CVS log

Up to [CSRG BSD Unix] / 43BSDReno / share / zoneinfo / datfiles

Annotation of 43BSDReno/share/zoneinfo/datfiles/northamerica, revision 1.1

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

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.