In tzdata1998i.tar.gz, I found that two timezones are defined for Japan. This is somewhat strange to me, because only JST (+0900) is used everywhere in Japan including Ishigaki island. I want to suggest that Asia/Ishigaki (CST, +0800) zone should be removed. However, you may wonder why it was added to the database, and in tzarchive I found the following comment: Date: Tue, 3 Sep 1996 17:14:22 -0700 From: Paul Eggert <eggert@twinsun.com> Subject: proposed patch for selecting TZ, MET->CST, Sri Lanka, Antarctica,...
Asia/Ishigaki - uncomment it, since it seems to be right
I don't know whether the zone was added at this time, but I suspect that it was added because of an ambiguous reason. So, I believe that it should be removed. I'm not on the tz list, so please leave my address in Cc: line when you reply. Thanks. -- hideyuki
I also examined other data concerning Japan in tzdata1998i. The patch at the bottom of this mail fixes the following points. - Only one timezone JST is used everywhere in Japan. - In tzdata1998i, the location of 'Tokyo' (+3542+13946) seems to be around the University of Tokyo. However, 'Tokyo' usually stands for the former location of Tokyo Astronomical Observatory: E 139 44' 40".90 (9h 18m 58s.727), N 35 39' 16".0. This data is from 'Rika Nenpyou (Chronological Scientific Tables) 1996' edited by National Astronomical Observatory of Japan. - JST (Japan Standard Time) has been used since Jan. 1, 1888 0:00AM (JST). The law is enacted on July 7, 1886. I couldn't understand the comment 'There is no information for Marcus.' Does anyone know what 'Marcus' is? -- hideyuki diff -u tzdata1998i/asia tzdata/asia --- tzdata1998i/asia Thu Sep 24 23:46:09 1998 +++ tzdata/asia Mon Nov 9 20:12:24 1998 @@ -610,12 +610,9 @@ # We go with Shanks and omit daylight saving in those years for Asia/Tokyo. # Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone Asia/Tokyo 9:19:04 - LMT 1896 +Zone Asia/Tokyo 9:18:59 - LMT 1887 9:00 - JST -Zone Asia/Ishigaki 8:16:36 - LMT 1896 - 8:00 - CST # There is no information for Marcus. -# Other Japanese possessions are probably like Asia/Tokyo. # Jordan # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S diff -u tzdata1998i/zone.tab tzdata/zone.tab --- tzdata1998i/zone.tab Thu Sep 24 23:46:11 1998 +++ tzdata/zone.tab Mon Nov 9 19:25:10 1998 @@ -188,8 +188,7 @@ IT +4154+01229 Europe/Rome JM +1800-07648 America/Jamaica JO +3157+03556 Asia/Amman -JP +3542+13946 Asia/Tokyo most locations -JP +2420+12409 Asia/Ishigaki south Ryukyu Islands +JP +3539+13944 Asia/Tokyo KE -0117+03649 Africa/Nairobi KG +4254+07436 Asia/Bishkek KH +1133+10455 Asia/Phnom_Penh
participants (1)
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Hideyuki Suzuki