-----Original Message----- From: Hideyuki Suzuki [SMTP:hideyuki@sat.t.u-tokyo.ac.jp] Sent: Monday, November 09, 1998 6:50 AM To: tz@elsie.nci.nih.gov Subject: Re: Asia/Ishigaki? 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
From: Hideyuki Suzuki [SMTP:hideyuki@sat.t.u-tokyo.ac.jp] Sent: Monday, November 09, 1998 6:50 AM 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. Is this true even for the Japanese possessions that are very close to Taiwan? Our main source (Shanks) says that they use Chinese time. This does seem a bit odd to me, since Shanks also writes that during World War II whenever Japan occupied a territory, they set its clocks to Tokyo time. From: Hideyuki Suzuki [SMTP:hideyuki@sat.t.u-tokyo.ac.jp] Sent: Saturday, November 07, 1998 11:54 AM only JST (+0900) is used everywhere in Japan including Ishigaki island. Can you please forward a reference for this? This will be useful when correcting the tables. In particular, is this a recent change, or has Ishigaki always used JST? The situation in Japan is a bit tricky. E.g. my guess is that Macarthur insisted on Japan using DST from 1948-1951, but Japanese birth records were always recorded in standard time regardless of Macarthur's edict, which is why Shanks omits DST for Tokyo during that time. Probably the right thing to do is to uncomment those parts of the rules, but I would like confirmation of my guess first.
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. The reason that I finally added it at that time was that a new edition of Shanks came out, with that data in it again, and nobody had ever commented about it while the rule was commented-out. I'd much rather remove it if it's bogus. Thanks for your other info; I'll use it in my next proposed patch.
From: Paul Eggert <eggert@twinsun.com> Subject: Re: FW: Asia/Ishigaki? Date: Mon, 9 Nov 1998 21:38:44 -0800 (PST)
only JST (+0900) is used everywhere in Japan including Ishigaki island.
Can you please forward a reference for this? This will be useful when correcting the tables. In particular, is this a recent change, or has Ishigaki always used JST?
Okay, I have no reference fot this now. As far as I know, the law enacted in 1886 says that the standard time for general use in this country is defined as the time on the meridian at E135 degree. (This sentence may not be precise due to my bad English.) At this time, Ishigaki is in the possessions of Japan. It may be changed later, but maybe I can find it in Japanese law. I'll report the result if I find it. Actually, Ishigaki island is in Okinawa prefecture, and my friends who have been to Okinawa main island said JST was used there...
The situation in Japan is a bit tricky. E.g. my guess is that Macarthur insisted on Japan using DST from 1948-1951, but Japanese birth records were always recorded in standard time regardless of Macarthur's edict, which is why Shanks omits DST for Tokyo during that time. Probably the right thing to do is to uncomment those parts of the rules, but I would like confirmation of my guess first.
Sorry, I don't know who (what?) Shanks is. I heard from my parents that DST was surely used right after the World War II. But I don't know the details either... Now I understand the problems, so I will check these points including Marcus island (Minami-Tori-shima: thanks for Japanese name!) when I can. Thank you for your information. -- hideyuki
From: Hideyuki Suzuki <hideyuki@sat.t.u-tokyo.ac.jp> Subject: Re: FW: Asia/Ishigaki? Date: Thu, 12 Nov 1998 01:44:27 +0900
only JST (+0900) is used everywhere in Japan including Ishigaki island.
Can you please forward a reference for this? This will be useful when correcting the tables. In particular, is this a recent change, or has Ishigaki always used JST?
Okay, I have no reference fot this now. As far as I know, the law enacted in 1886 says that the standard time for general use in this country is defined as the time on the meridian at E135 degree. (This sentence may not be precise due to my bad English.) At this time, Ishigaki is in the possessions of Japan. It may be changed later, but maybe I can find it in Japanese law. I'll report the result if I find it.
I asked about it to Frequency and Time Standards Section in Communications Research Laboratory, where JST is maintained. Before the World War II, there are several laws regarding standard time. As I wrote, the ordinance No. 51 (1886) established "standard time" in Japan, which stands for the time on E 135 degree. In the ordinance No. 167 (1895), "standard time" was renamed to "central standard time". And the same ordinance also established "western standard time", which stands for the time on E 120 degree. This may be a ground of +0800. But "western standard time" was abolished in the ordinance No. 529 (1937). In the ordinance No. 167, there is no mention regarding for what place western standard time is standard... Please note that, since then, there has been no law which support standard time except for JST. I wrote "ordinance" above, but I don't know how to translate. In Japanese it's "chokurei", which means ordinance from emperor. They said there are no law regarding standard time in these days. However, they said that it is correct to say there are only one timezone now in Japan in the legal and factual sense. There may be no good reference to state there are only one timezone... -- hideyuki
participants (3)
-
Hideyuki Suzuki -
Olson, Arthur David (NCI) -
Paul Eggert