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Correct times for Asia/Taipei before 1945-10-25.

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(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.
This commit is contained in:
Paul Eggert
2014-07-01 18:22:00 -07:00
parent e30b13efd4
commit a26af2be66
2 changed files with 66 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
NEWS
View File

@@ -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.)

64
asia
View File

@@ -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