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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.
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eggert committed Oct 31, 2014
1 parent 6ea8fa7 commit 929c14a3d8ce505a9b8fb7099bee3a03ccf7e8e4
Showing with 63 additions and 25 deletions.
  1. +11 −0 NEWS
  2. +52 −25 asia
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11 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
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77 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
###############################################################################

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