From 929c14a3d8ce505a9b8fb7099bee3a03ccf7e8e4 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Thu, 30 Oct 2014 23:27:26 -0700 Subject: [PATCH] Correct many pre-1989 entries for Korea. (Thanks to Sanghyuk Jung.) * asia (ROK): Add entries for 1948-1959 and correct entries for 1987-1988. (Asia/Seoul): Correct entries through 1962. (Asia/Pyongyang): Guess no change since World War II. * NEWS: Document this. --- NEWS | 11 +++++++++ asia | 77 ++++++++++++++++++++++++++++++++++++++++-------------------- 2 files changed, 63 insertions(+), 25 deletions(-) diff --git a/NEWS b/NEWS index 4e119ecdf..2485c93ed 100644 --- a/NEWS +++ b/NEWS @@ -1,5 +1,16 @@ News for the tz database +Unreleased, experimental changes + + Changes affecting past time stamps + + Many pre-1989 time stamps have been corrected for Asia/Seoul and + Asia/Pyongyang, based on sources for the Korean-language Wikipedia + entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no + longer guess that Pyongyang mimicked Seoul time after World War II, + as this is politically implausible. + + Release 2014i - 2014-10-21 22:04:57 -0700 Changes affecting future time stamps diff --git a/asia b/asia index 37b2c88e0..217e8eeb5 100644 --- a/asia +++ b/asia @@ -1663,44 +1663,71 @@ Zone Asia/Bishkek 4:58:24 - LMT 1924 May 2 # Korea (North and South) # From Annie I. Bang (2006-07-10): -# http://www.koreaherald.co.kr/SITE/data/html_dir/2006/07/10/200607100012.asp -# The Ministry of Commerce, Industry and Energy has already -# commissioned a research project [to reintroduce DST] and has said -# the system may begin as early as 2008.... Korea ran a daylight -# saving program from 1949-61 but stopped it during the 1950-53 Korean War. +# http://www.koreaherald.com/view.php?ud=200607100012 +# Korea ran a daylight saving program from 1949-61 but stopped it +# during the 1950-53 Korean War. The system was temporarily enforced +# between 1987 and 1988 ... + +# From Sanghyuk Jung (2014-10-29): +# http://mm.icann.org/pipermail/tz/2014-October/021830.html +# According to the Korean Wikipedia +# http://ko.wikipedia.org/wiki/한국_표준시 +# [oldid=12896437 2014-09-04 08:03 UTC] +# DST in Republic of Korea was as follows.... And I checked old +# newspapers in Korean, all articles correspond with data in Wikipedia. +# For example, the article in 1948 (Korean Language) proved that DST +# started at June 1 in that year. For another example, the article in +# 1988 said that DST started at 2:00 AM in that year. -# From Shanks & Pottenger: # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule ROK 1960 only - May 15 0:00 1:00 D -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 +Rule ROK 1948 only - Jun 1 0:00 1:00 D +Rule ROK 1948 only - Sep 13 0:00 0 S +Rule ROK 1949 only - Apr 3 0:00 1:00 D +Rule ROK 1949 1951 - Sep Sun>=8 0:00 0 S +Rule ROK 1950 only - Apr 1 0:00 1:00 D +Rule ROK 1951 only - May 6 0:00 1:00 D +Rule ROK 1955 only - May 5 0:00 1:00 D +Rule ROK 1955 only - Sep 9 0:00 0 S +Rule ROK 1956 only - May 20 0:00 1:00 D +Rule ROK 1956 only - Sep 30 0:00 0 S +Rule ROK 1957 1960 - May Sun>=1 0:00 1:00 D +Rule ROK 1957 1960 - Sep Sun>=18 0:00 0 S +Rule ROK 1987 1988 - May Sun>=8 2:00 1:00 D +Rule ROK 1987 1988 - Oct Sun>=8 3:00 0 S + +# From Paul Eggert (2014-10-30): +# The Korean Wikipedia entry gives the following sources for UT offsets: +# +# 1908: Official Journal Article No. 3994 (Edict No. 5) +# 1912: Governor-General of Korea Official Gazette Issue No. 367 +# (Announcement No. 338) +# 1954: Presidential Decree No. 876 (1954-03-17) +# 1961: Law No. 676 (1961-08-07) +# 1987: Law No. 3919 (1986-12-31) +# +# The Wikipedia entry also has confusing information about a change +# to UT+9 in April 1910, but then what would be the point of the later change +# to UT+9 on 1912-01-01? Omit the 1910 change for now. +# +# 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. +# +# For Pyongyang we have no information; guess no changes since World War II. # Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone Asia/Seoul 8:27:52 - LMT 1890 - 8:30 - KST 1904 Dec - 9:00 - JCST 1928 - 8:30 - KST 1932 +Zone Asia/Seoul 8:27:52 - LMT 1908 Apr 1 + 8:30 - KST 1912 Jan 1 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 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 - JCST 1928 - 8:30 - KST 1932 +Zone Asia/Pyongyang 8:23:00 - LMT 1908 Apr 1 + 8:30 - KST 1912 Jan 1 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 ###############################################################################