[tz] About Time Zone in Asia/Taipei During World War 2

Paul Eggert eggert at cs.ucla.edu
Wed Jul 2 01:33:00 UTC 2014


On 2013-07-11 Yu-Cheng Chuang wrote:
> I hope that the history above helps you improve the Time Zone database.

It did, and thank you!  Sorry about the late reply, but since this was 
about time stamps before 1946 there was no rush.  I have installed the 
attached patch into the experimental tz database on github and I hope 
something like it will appear in the next release.  One advantage of 
waiting so long is that in the meantime we switched to UTF-8 commentary 
in the database so it can now include URLs like 
<http://ja.wikisource.org/wiki/標準時ニ關スル件_(公布時)>.
-------------- next part --------------
From a26af2be6618a1138191a69a329964192b187075 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert at cs.ucla.edu>
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



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