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

1.1     ! root        1: # @(#)europe   4.10
        !             2: 
        !             3: # International country codes are used to identify countries' rules and
        !             4: # zones
        !             5: #
        !             6: # This data is by no means authoritative; if you think you know better, go
        !             7: # ahead and edit the file (and please send any changes to
        !             8: # [email protected] for general use in the future).
        !             9: 
        !            10: ###############################################################################
        !            11: 
        !            12: # United Kingdom
        !            13: 
        !            14: # From Arthur David Olson (January 19, 1989):
        !            15: #
        !            16: # The starting and ending dates below (from which the rules are derived)
        !            17: # are from Whitaker's Almanack for 1987, page 146.
        !            18: # 1960 is the earliest year for which dates are given;
        !            19: # Whitaker's notes that British Summer Time (and, in some years, Double Summer
        !            20: # Time) was observed in earlier years but does not give start and end dates.
        !            21: #
        !            22: # A source at the British Information Office in New York avers that it's
        !            23: # known as "British" Summer Time in all parts of the United Kingdom.
        !            24: #      1960    April 10        October 2 (yes, 2, according to the almanac)
        !            25: #      1961    March 26        October 29
        !            26: #      1962    March 25        October 28
        !            27: #      1963    March 31        October 27
        !            28: #      1964    March 22        October 25
        !            29: #      1965    March 21        October 24
        !            30: #      1966    March 20        October 23
        !            31: #      1967    March 19        October 29
        !            32: #      1968    February 18     October 27
        !            33: # "British Standard Time, also one hour ahead of G. M. T., was kept between
        !            34: # 1968 Oct. 27-1971 Oct. 31."
        !            35: #      1972    March 19        October 29
        !            36: #      1973    March 18        October 28
        !            37: #      1974    March 17        October 27
        !            38: #      1975    March 16        October 26
        !            39: #      1976    March 21        October 24
        !            40: #      1977    March 20        October 23
        !            41: #      1978    March 19        October 29
        !            42: #      1979    March 18        October 28
        !            43: #      1980    March 16        October 26
        !            44: #      1981    March 29        October 25
        !            45: #      1982    March 28        October 24
        !            46: #      1983    March 27        October 23
        !            47: #      1984    March 25        October 28
        !            48: #      1985    March 31        October 27
        !            49: #      1986    March 30        October 26
        !            50: #      1987    March 29        October 25
        !            51: 
        !            52: # From an Anonymous U. K. Donor (January 4, 1989):
        !            53: #
        !            54: # It is NOT possible to predict when [British Summer Time] will change
        !            55: # in a future year.
        !            56: # 
        !            57: # (The admiralty calculate when they think it should be (no more that a couple
        !            58: # of years in advance) and advise the government who then decide whether or 
        !            59: # not they will take the admiralty's advice)
        !            60: # 
        !            61: # ...the Gre[e]nwich...observatory...[was] very helpful.
        !            62: # 
        !            63: # I was not able to track down the Admiralty formula (I tried hard but failed)
        !            64: 
        !            65: # ...
        !            66: # Date: 4 Jan 89 08:57:25 GMT (Wed)
        !            67: # From: Jonathan Leffler <nih-csl!uunet!mcvax!sphinx.co.uk!john>
        !            68: # ...
        !            69: # [British Summer Time] is fixed annually by Act of Parliament.
        !            70: # If you can predict what Parliament will do, you should be in
        !            71: # politics making a fortune, not computing.
        !            72: #
        !            73: # Summer time ends on Sunday 29 October 1989.
        !            74: 
        !            75: # ...
        !            76: # Date: 5 Jan 89 09:50:38 GMT (Thu)
        !            77: # From: Peter Kendell <nih-csl!uunet!mcvax!tcom.stc.co.uk!pete>
        !            78: # ...
        !            79: # 
        !            80: # From my Collins Diary for 1989 - 
        !            81: # 
        !            82: # "At the time of going to press the Home Office was unable to confirm
        !            83: # the 1989 starting and finishing dates for BST*, but expressed the 
        !            84: # view that 26 March and 29 October were the likeliest dates to be
        !            85: # adopted"
        !            86: # 
        !            87: # *British Summer Time.
        !            88: 
        !            89: # From an Anonymous U. K. Donor (January 5, 1989):
        !            90: #
        !            91: # . . .our government is seriously considering applying Double Summer Time -
        !            92: # putting the clocks forwards and back TWO hours for daylight saving time.
        !            93: # This is advocated to standardise time in the EEC - we're all supposed to
        !            94: # keep the same time and to change the clocks on the same dates in the future.
        !            95: 
        !            96: # Rule NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
        !            97: # Historic starting rules
        !            98: Rule   GB-Eire 1960    only    -       Apr     10      1:00s   1:00    BST
        !            99: Rule   GB-Eire 1961    1963    -       Mar     lastSun 1:00s   1:00    BST
        !           100: Rule   GB-Eire 1964    1967    -       Mar     Sun>=19 1:00s   1:00    BST
        !           101: Rule   GB-Eire 1968    only    -       Feb     18      1:00s   1:00    BST
        !           102: Rule   GB-Eire 1972    1980    -       Mar     Sun>=16 1:00s   1:00    BST
        !           103: # Historic ending rules
        !           104: Rule   GB-Eire 1960    only    -       Oct     2       1:00s   0       GMT
        !           105: Rule   GB-Eire 1961    1967    -       Oct     Sun>=23 1:00s   0       GMT
        !           106: Rule   GB-Eire 1971    only    -       Oct     31      1:00s   0       GMT
        !           107: # Current rules
        !           108: Rule   GB-Eire 1981    max     -       Mar     lastSun 1:00s   1:00    BST
        !           109: Rule   GB-Eire 1972    max     -       Oct     Sun>=23 1:00s   0       GMT
        !           110: 
        !           111: # Zone NAME            GMTOFF  RULES/SAVE      FORMAT  [UNTIL]
        !           112: Zone   GB-Eire         0:00    GB-Eire         %s      1968 Oct 27 1:00s
        !           113:                        1:00    -               BST     1971 Oct 31 1:00s
        !           114:                        0:00    GB-Eire         %s
        !           115: 
        !           116: ###############################################################################
        !           117: 
        !           118: # Continental Europe
        !           119: 
        !           120: # The use of 1986 as starting years below is conservative.
        !           121: 
        !           122: Rule   W-Eur   1986    max     -       Mar     lastSun 1:00s   1:00    " DST"
        !           123: Rule   W-Eur   1986    max     -       Sep     lastSun 1:00s   0       -
        !           124: 
        !           125: Rule   M-Eur   1986    max     -       Mar     lastSun 2:00s   1:00    " DST"
        !           126: Rule   M-Eur   1986    max     -       Sep     lastSun 2:00s   0       -
        !           127: 
        !           128: Rule   E-Eur   1986    max     -       Mar     lastSun 3:00s   1:00    " DST"
        !           129: Rule   E-Eur   1986    max     -       Sep     lastSun 3:00s   0       -
        !           130: 
        !           131: Rule   Turkey  1986    max     -       Mar     lastSun 1:00    1:00    " DST"
        !           132: Rule   Turkey  1986    max     -       Sep     lastSun 1:00    0       -
        !           133: 
        !           134: Rule   W-SU    1986    max     -       Mar     lastSun 2:00s   1:00    " DST"
        !           135: Rule   W-SU    1986    max     -       Sep     lastSun 2:00s   0       -
        !           136: 
        !           137: # Zone NAME            GMTOFF  RULES/SAVE      FORMAT  [UNTIL]
        !           138: Zone   WET             0:00    W-Eur           WET%s
        !           139: Zone   Iceland         0:00    -               WET
        !           140: Zone   MET             1:00    M-Eur           MET%s
        !           141: Zone   Poland          1:00    W-Eur           MET%s
        !           142: Zone   EET             2:00    E-Eur           EET%s
        !           143: Zone   Turkey          3:00    Turkey          EET%s
        !           144: Zone   W-SU            3:00    M-Eur           ????
        !           145: 
        !           146: # Tom Hoffman says that MET is also known as Central European Time
        !           147: 
        !           148: Link   MET     CET
        !           149: 
        !           150: ###############################################################################
        !           151: 
        !           152: # One source shows that Bulgaria, Cyprus, Finland, and Greece observe DST from
        !           153: # the last Sunday in March to the last Sunday in September in 1986.
        !           154: # The source shows Romania changing a day later than everybody else.
        !           155: #
        !           156: # According to Bernard Sieloff's source, Poland is in the MET time zone but
        !           157: # uses the WE DST rules.  The Western USSR uses EET+1 and ME DST rules.
        !           158: # Bernard Sieloff's source claims Romania switches on the same day, but at
        !           159: # 00:00 standard time (i.e., 01:00 DST).  It also claims that Turkey
        !           160: # switches on the same day, but switches on at 01:00 standard time
        !           161: # and off at 00:00 standard time (i.e., 01:00 DST)
        !           162: 
        !           163: # ...
        !           164: # Date: Wed, 28 Jan 87 16:56:27 -0100
        !           165: # From: seismo!mcvax!cgcha!wtho (Tom Hofmann)
        !           166: # Message-Id: <[email protected]>
        !           167: # ...
        !           168: # 
        !           169: # ...the European time rules are...standardized since 1981, when
        !           170: # most European coun[tr]ies started DST.  Before that year, only
        !           171: # a few countries (UK, France, Italy) had DST, each according
        !           172: # to own national rules.  In 1981, however, DST started on
        !           173: # 'Apr firstSun', and not on 'Mar lastSun' as in the following
        !           174: # years...
        !           175: # But also since 1981 there are some more national exceptions 
        !           176: # than listed in 'europe': Switzerland, for example, joined DST 
        !           177: # one year later, Denmark ended DST on 'Oct 1' instead of 'Sep 
        !           178: # lastSun' in 1981---I don't know how they handle now.
        !           179: # 
        !           180: # Finally, DST ist always from 'Apr 1' to 'Oct 1' in the
        !           181: # Soviet Union (as far as I know).  
        !           182: # 
        !           183: # Tom Hofmann, Scientific Computer Center, CIBA-GEIGY AG,
        !           184: # 4002 Basle, Switzerland
        !           185: # UUCP: ...!mcvax!cernvax!cgcha!wtho
        !           186: 
        !           187: # ...
        !           188: # Date: Wed, 4 Feb 87 22:35:22 +0100
        !           189: # From: seismo!mcvax!cwi.nl!dik (Dik T. Winter)
        !           190: # ...
        !           191: # 
        !           192: # The information from Tom Hofmann is (as far as I know) not entirely correct.
        !           193: # After a request from chongo at amdahl I tried to retrieve all information
        !           194: # about DST in Europe.  I was able to find all from about 1969.
        !           195: # 
        !           196: # ...standardization on DST in Europe started in about 1977 with switches on
        !           197: # first Sunday in April and last Sunday in September...
        !           198: # In 1981 UK joined Europe insofar that
        !           199: # the starting day for both shifted to last Sunday in March.  And from 1982
        !           200: # the whole of Europe used DST, with switch dates April 1 and October 1 in
        !           201: # the Sov[i]et Union.  In 1985 the SU reverted to standard Europe[a]n switch
        !           202: # dates...
        !           203: # 
        !           204: # It should also be remembered that time-zones are not constants; e.g.
        !           205: # Portugal switched in 1976 from MET (or CET) to WET with DST...
        !           206: # Note also that though there were rules for switch dates not
        !           207: # all countries abided to these dates, and many individual deviations
        !           208: # occurred, though not since 1982 I believe.  Another note: it is always
        !           209: # assumed that DST is 1 hour ahead of normal time, this need not be the
        !           210: # case; at least in the Netherlands there have been times when DST was 2 hours
        !           211: # in advance of normal time.
        !           212: # 
        !           213: # ...
        !           214: # dik t. winter, cwi, amsterdam, nederland
        !           215: # INTERNET   : [email protected]
        !           216: # BITNET/EARN: dik@mcvax
        !           217: 
        !           218: # From Bob Devine (January 28, 1988):
        !           219: # ...
        !           220: # Greece: Last Sunday in April to last Sunday in September (iffy on dates).
        !           221: # Since 1978.  Change at midnight.
        !           222: # ...
        !           223: # Monaco: has same DST as France.
        !           224: # ...

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