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rev 55760 : [mq]: 8212970


1864 # [T]he webpage authored by National Astronomical Observatory of Japan
1865 # https://eco.mtk.nao.ac.jp/koyomi/wiki/BBFEB9EF2FB2C6BBFEB9EF.html
1866 # ... mentioned that using Showa 23 (year 1948) as example, 13pm of September
1867 # 11 in summer time will equal to 0am of September 12 in standard time.
1868 # It cited a document issued by the Liaison Office which briefly existed
1869 # during the postwar period of Japan, where the detail on implementation
1870 # of the summer time is described in the document.
1871 # https://eco.mtk.nao.ac.jp/koyomi/wiki/BBFEB9EF2FB2C6BBFEB9EFB2C6BBFEB9EFA4CEBCC2BBDCA4CBA4C4A4A4A4C6.pdf
1872 # The text in the document do instruct a fall back to occur at
1873 # September 11, 13pm in summer time, while ordinary citizens can
1874 # change the clock before they sleep.
1875 #
1876 # From Paul Eggert (2018-09-27):
1877 # This instruction is equivalent to "Sat>=8 25:00", so use that.  zic treats
1878 # it like "Sun>=9 01:00", which is not quite the same but is the best we can
1879 # do in any POSIX or C platform.  The "25:00" assumes zic from 2007 or later,
1880 # which should be safe now.
1881 
1882 # Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
1883 Rule    Japan   1948    only    -       May     Sat>=1       24:00   1:00    D
1884 Rule    Japan   1948    1951    -       Sep     Sun>=9        1:00   0       S
1885 Rule    Japan   1949    only    -       Apr     Sat>=1       24:00   1:00    D
1886 Rule    Japan   1950    1951    -       May     Sat>=1       24:00   1:00    D
1887 
1888 # From Hideyuki Suzuki (1998-11-09):
1889 # 'Tokyo' usually stands for the former location of Tokyo Astronomical
1890 # Observatory: 139° 44' 40.90" E (9h 18m 58.727s), 35° 39' 16.0" N.
1891 # This data is from 'Rika Nenpyou (Chronological Scientific Tables) 1996'
1892 # edited by National Astronomical Observatory of Japan....
1893 # JST (Japan Standard Time) has been used since 1888-01-01 00:00 (JST).
1894 # The law is enacted on 1886-07-07.
1895 
1896 # From Hideyuki Suzuki (1998-11-16):
1897 # The ordinance No. 51 (1886) established "standard time" in Japan,
1898 # which stands for the time on 135° E.
1899 # In the ordinance No. 167 (1895), "standard time" was renamed to "central
1900 # standard time".  And the same ordinance also established "western standard
1901 # time", which stands for the time on 120° E....  But "western standard
1902 # time" was abolished in the ordinance No. 529 (1937).  In the ordinance No.
1903 # 167, there is no mention regarding for what place western standard time is
1904 # standard....




1864 # [T]he webpage authored by National Astronomical Observatory of Japan
1865 # https://eco.mtk.nao.ac.jp/koyomi/wiki/BBFEB9EF2FB2C6BBFEB9EF.html
1866 # ... mentioned that using Showa 23 (year 1948) as example, 13pm of September
1867 # 11 in summer time will equal to 0am of September 12 in standard time.
1868 # It cited a document issued by the Liaison Office which briefly existed
1869 # during the postwar period of Japan, where the detail on implementation
1870 # of the summer time is described in the document.
1871 # https://eco.mtk.nao.ac.jp/koyomi/wiki/BBFEB9EF2FB2C6BBFEB9EFB2C6BBFEB9EFA4CEBCC2BBDCA4CBA4C4A4A4A4C6.pdf
1872 # The text in the document do instruct a fall back to occur at
1873 # September 11, 13pm in summer time, while ordinary citizens can
1874 # change the clock before they sleep.
1875 #
1876 # From Paul Eggert (2018-09-27):
1877 # This instruction is equivalent to "Sat>=8 25:00", so use that.  zic treats
1878 # it like "Sun>=9 01:00", which is not quite the same but is the best we can
1879 # do in any POSIX or C platform.  The "25:00" assumes zic from 2007 or later,
1880 # which should be safe now.
1881 
1882 # Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
1883 Rule    Japan   1948    only    -       May     Sat>=1       24:00   1:00    D
1884 Rule    Japan   1948    1951    -       Sep     Sat>=8       25:00   0       S
1885 Rule    Japan   1949    only    -       Apr     Sat>=1       24:00   1:00    D
1886 Rule    Japan   1950    1951    -       May     Sat>=1       24:00   1:00    D
1887 
1888 # From Hideyuki Suzuki (1998-11-09):
1889 # 'Tokyo' usually stands for the former location of Tokyo Astronomical
1890 # Observatory: 139° 44' 40.90" E (9h 18m 58.727s), 35° 39' 16.0" N.
1891 # This data is from 'Rika Nenpyou (Chronological Scientific Tables) 1996'
1892 # edited by National Astronomical Observatory of Japan....
1893 # JST (Japan Standard Time) has been used since 1888-01-01 00:00 (JST).
1894 # The law is enacted on 1886-07-07.
1895 
1896 # From Hideyuki Suzuki (1998-11-16):
1897 # The ordinance No. 51 (1886) established "standard time" in Japan,
1898 # which stands for the time on 135° E.
1899 # In the ordinance No. 167 (1895), "standard time" was renamed to "central
1900 # standard time".  And the same ordinance also established "western standard
1901 # time", which stands for the time on 120° E....  But "western standard
1902 # time" was abolished in the ordinance No. 529 (1937).  In the ordinance No.
1903 # 167, there is no mention regarding for what place western standard time is
1904 # standard....


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