From a26af2be6618a1138191a69a329964192b187075 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Tue, 1 Jul 2014 18:22:00 -0700 Subject: [PATCH] Correct times for Asia/Taipei before 1945-10-25. (Thanks to Yu-Cheng Chuang.) Also, update time zone abbreviations for Japan's two time zones used 1896-1937. JWST now stands for Western Standard Time, and JCST for Central Standard Time (formerly this was CJT). * asia (Taiwan): Omit DST during 1945. (Asia/Taipei): Add a transition to JWST on 1896-01-01, then to JST on 1937-10-01, then to CST on 1945-10-25. (Asia/Tokyo): Rename CJT to JCST. Transition to JCST was 1937-10-01, not 1938. (Asia/Seoul, Asia/Pyongyang): Call UT+9 "JCST" until 1937-01-01, "JST" thereafter. Assume JCST/JST until Allied takeover after WWII. * NEWS: Document this. --- NEWS | 10 ++++++++++ asia | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------- 2 files changed, 66 insertions(+), 8 deletions(-) diff --git a/NEWS b/NEWS index d80bee1..c11e300 100644 --- a/NEWS +++ b/NEWS @@ -23,6 +23,12 @@ Unreleased, experimental changes The time zone abbreviation for Xinjiang Time (observed in Ürümqi) has been changed from URUT to XJT. (Thanks to Luther Ma.) + Time zone abbreviations have been updated for Japan's two time + zones used 1896-1937. JWST now stands for Western Standard + Time, and JCST for Central Standard Time (formerly this was CJT). + These abbreviations are now used for time in Korea and Taiwan + while controlled by Japan. + Changes affecting past time stamps China's five zones have been simplified to two, since the post-1970 @@ -38,6 +44,10 @@ Unreleased, experimental changes 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its transition to standard time has been changed from 1928 to 1901. + Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-01-01, + then to CST on 1945-10-25, and did not observe DST in 1945. + (Thanks to Yu-Cheng Chuang.) + Finland's 1942 fall-back transition was October 4 at 01:00, not October 3 at 00:00. (Thanks to Konstantin Hyppönen.) diff --git a/asia b/asia index 889a738..75c5fd9 100644 --- a/asia +++ b/asia @@ -46,7 +46,8 @@ # 7:00 WIB west Indonesia (Waktu Indonesia Barat) # 8:00 WITA central Indonesia (Waktu Indonesia Tengah) # 8:00 CST China -# 9:00 CJT Central Japanese Time (1896/1937)* +# 8:00 JWST Western Standard Time (Japan, 1896/1937)* +# 9:00 JCST Central Standard Time (Japan, 1896/1937) # 9:00 WIT east Indonesia (Waktu Indonesia Timur) # 9:00 JST JDT Japan # 9:00 KST KDT Korea @@ -643,9 +644,43 @@ Zone Asia/Hong_Kong 7:36:42 - LMT 1904 Oct 30 # Republic of China 68 years (AD 1979) Daylight Saving Time July 1 to September 30 # Republic of China since 69 years (AD 1980) Stop Daylight Saving Time +# From Yu-Cheng Chuang (2013-07-12): +# On Dec 28, 1895, the Meiji Emperor announced Ordinance No. 167 of +# Meiji Year 28 "The clause about standard time", mentioned that +# Taiwan and Penghu Islands, as well as Yaeyama and Miyako Islands +# (both in Okinawa) adopt the Western Standard Time which is based on +# 120E. The adoption began from Jan 1, 1896. The original text can be +# found on Wikisource: +# http://ja.wikisource.org/wiki/標準時ニ關スル件_(公布時) +# ... This could be the first adoption of time zone in Taiwan, because +# during the Qing Dynasty, it seems that there was no time zone +# declared officially. +# +# Later, in the beginning of World War II, on Sep 25, 1937, the Showa +# Emperor announced Ordinance No. 529 of Showa Year 12 "The clause of +# revision in the ordinance No. 167 of Meiji year 28 about standard +# time", in which abolished the adoption of Western Standard Time in +# western islands (listed above), which means the whole Japan +# territory, including later occupations, adopt Japan Central Time +# (UTC+9). The adoption began on Oct 1, 1937. The original text can +# be found on Wikisource: +# http://ja.wikisource.org/wiki/明治二十八年勅令第百六十七號標準時ニ關スル件中改正ノ件 +# +# That is, the time zone of Taipei switched to UTC+9 on Oct 1, 1937. +# +# Of course, after the surrender of Japan, time zone of Taiwan +# switched back to UTC+8. However I can't find enough evidence to tell +# when the switch happened. The only thing I know is that the official +# surrender ceremony is on Oct 25, 1945. From then, Taiwan and Penghu +# islands are territories of the Republic of China, until now. + +# From Paul Eggert (2014-07-01): +# As per Yu-Cheng Chuang, say that Taiwan was at UT+9 from 1937-10-01 +# until 1945-10-25, overriding Shanks & Pottenger. + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Taiwan 1945 1951 - May 1 0:00 1:00 D -Rule Taiwan 1945 1951 - Oct 1 0:00 0 S +Rule Taiwan 1946 1951 - May 1 0:00 1:00 D +Rule Taiwan 1946 1951 - Oct 1 0:00 0 S Rule Taiwan 1952 only - Mar 1 0:00 1:00 D Rule Taiwan 1952 1954 - Nov 1 0:00 0 S Rule Taiwan 1953 1959 - Apr 1 0:00 1:00 D @@ -657,7 +692,10 @@ Rule Taiwan 1979 only - Jun 30 0:00 1:00 D Rule Taiwan 1979 only - Sep 30 0:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone Asia/Taipei 8:06:00 - LMT 1896 # or Taibei or T'ai-pei +# Taipei or Taibei or T'ai-pei +Zone Asia/Taipei 8:06:00 - LMT 1896 Jan 1 + 8:00 - JWST 1937 Oct 1 + 9:00 - JST 1945 Oct 25 8:00 Taiwan C%sT # Macau (Macao, Aomen) @@ -1336,8 +1374,8 @@ Rule Japan 1950 1951 - May Sun>=1 2:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Tokyo 9:18:59 - LMT 1887 Dec 31 15:00u - 9:00 - JST 1896 - 9:00 - CJT 1938 + 9:00 - JST 1896 Jan 1 + 9:00 - JCST 1937 Oct 1 9:00 Japan J%sT # Since 1938, all Japanese possessions have been like Asia/Tokyo. @@ -1576,19 +1614,29 @@ Rule ROK 1960 only - Sep 13 0:00 0 S Rule ROK 1987 1988 - May Sun>=8 0:00 1:00 D Rule ROK 1987 1988 - Oct Sun>=8 0:00 0 S +# From Paul Eggert (2014-07-01): +# The following entries are from Shanks & Pottenger, except that I +# guessed that time zone abbreviations through 1945 followed the same +# rules as discussed under Taiwan, with nominal switches from JST to KST +# when the respective cities were taken over by the Allies after WWII. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Seoul 8:27:52 - LMT 1890 8:30 - KST 1904 Dec - 9:00 - KST 1928 + 9:00 - JCST 1928 8:30 - KST 1932 + 9:00 - JCST 1937 Oct 1 + 9:00 - JST 1945 Sep 8 9:00 - KST 1954 Mar 21 8:00 ROK K%sT 1961 Aug 10 8:30 - KST 1968 Oct 9:00 ROK K%sT Zone Asia/Pyongyang 8:23:00 - LMT 1890 8:30 - KST 1904 Dec - 9:00 - KST 1928 + 9:00 - JCST 1928 8:30 - KST 1932 + 9:00 - JCST 1937 Oct 1 + 9:00 - JST 1945 Aug 24 9:00 - KST 1954 Mar 21 8:00 - KST 1961 Aug 10 9:00 - KST -- 1.9.1