changeset 13050:5a51c4a6e74a tip

8203233: (tz) Upgrade time-zone data to tzdata2018e Reviewed-by: martin, naoto
author rpatil
date Tue, 05 Jun 2018 02:17:36 -0700
parents b334d6bb2a3f
children
files make/data/tzdata/VERSION make/data/tzdata/africa make/data/tzdata/asia make/data/tzdata/australasia make/data/tzdata/europe test/sun/util/calendar/zi/tzdata/VERSION test/sun/util/calendar/zi/tzdata/africa test/sun/util/calendar/zi/tzdata/asia test/sun/util/calendar/zi/tzdata/australasia test/sun/util/calendar/zi/tzdata/europe
diffstat 10 files changed, 168 insertions(+), 44 deletions(-) [+]
line wrap: on
line diff
--- a/make/data/tzdata/VERSION	Thu May 31 12:25:23 2018 -0700
+++ b/make/data/tzdata/VERSION	Tue Jun 05 02:17:36 2018 -0700
@@ -21,4 +21,4 @@
 # or visit www.oracle.com if you need additional information or have any
 # questions.
 #
-tzdata2018d
+tzdata2018e
--- a/make/data/tzdata/africa	Thu May 31 12:25:23 2018 -0700
+++ b/make/data/tzdata/africa	Tue Jun 05 02:17:36 2018 -0700
@@ -29,7 +29,7 @@
 # tz@iana.org for general use in the future).  For more, please see
 # the file CONTRIBUTING in the tz distribution.
 
-# From Paul Eggert (2017-02-20):
+# From Paul Eggert (2017-04-09):
 #
 # Unless otherwise specified, the source for data through 1990 is:
 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
@@ -75,7 +75,7 @@
 # cannot now come up with solid citations.
 #
 # I invented the following abbreviations; corrections are welcome!
-#	 +02	WAST	West Africa Summer Time
+#	 +02	WAST	West Africa Summer Time (no longer used)
 #	 +03	CAST	Central Africa Summer Time (no longer used)
 #	 +03	SAST	South Africa Summer Time (no longer used)
 #	 +03	EAT	East Africa Time
@@ -990,6 +990,10 @@
 # commence at OOhOO on Monday 21 March 1994 and shall end at 02h00 on
 # Sunday 4 September 1994.
 
+# From Michael Deckers (2017-04-06):
+# ... both summer and winter time are called "standard"
+# (which differs from the use in Ireland) ...
+
 # From Petronella Sibeene (2007-03-30):
 # http://allafrica.com/stories/200703300178.html
 # While the entire country changes its time, Katima Mulilo and other
@@ -1015,19 +1019,42 @@
 # the same time they would normally start DST, the first Sunday in September:
 # https://www.timeanddate.com/news/time/namibia-new-time-zone.html
 
+# From Paul Eggert (2017-04-09):
+# Before the change, summer and winter time were both standard time legally.
+# However in common parlance, winter time was considered to be DST.  See, e.g.:
+# http://www.nbc.na/news/namibias-winter-time-could-be-scrapped.2706
+# https://zone.my.na/news/times-are-changing-in-namibia
+# https://www.newera.com.na/2017/02/23/namibias-winter-time-might-be-repealed/
+# Use plain "WAT" and "CAT" for the time zone abbreviations, to be compatible
+# with Namibia's neighbors.
+
 # RULE	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
-Rule	Namibia	1994	only	-	Mar	21	0:00	0	-
-Rule	Namibia	1994	2016	-	Sep	Sun>=1	2:00	1:00	S
-Rule	Namibia	1995	2017	-	Apr	Sun>=1	2:00	0	-
+# Vanguard section, for zic and other parsers that support negative DST.
+#Rule	Namibia	1994	only	-	Mar	21	0:00	-1:00	WAT
+#Rule	Namibia	1994	2017	-	Sep	Sun>=1	2:00	0	CAT
+#Rule	Namibia	1995	2017	-	Apr	Sun>=1	2:00	-1:00	WAT
+# Rearguard section, for parsers that do not support negative DST.
+Rule	Namibia	1994	only	-	Mar	21	0:00	0	WAT
+Rule	Namibia	1994	2017	-	Sep	Sun>=1	2:00	1:00	CAT
+Rule	Namibia	1995	2017	-	Apr	Sun>=1	2:00	0	WAT
+# End of rearguard section.
+
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Windhoek	1:08:24 -	LMT	1892 Feb 8
 			1:30	-	+0130	1903 Mar
 			2:00	-	SAST	1942 Sep 20  2:00
 			2:00	1:00	SAST	1943 Mar 21  2:00
 			2:00	-	SAST	1990 Mar 21 # independence
+# Vanguard section, for zic and other parsers that support negative DST.
+#			2:00	Namibia	%s
+# Rearguard section, for parsers that do not support negative DST.
 			2:00	-	CAT	1994 Mar 21  0:00
-			1:00	Namibia	WA%sT	2017 Sep  3  2:00
+# From Paul Eggert (2017-04-07):
+# The official date of the 2017 rule change was 2017-10-24.  See:
+# http://www.lac.org.na/laws/annoSTAT/Namibian%20Time%20Act%209%20of%202017.pdf
+			1:00	Namibia	%s	2017 Oct 24
 			2:00	-	CAT
+# End of rearguard section.
 
 # Niger
 # See Africa/Lagos.
--- a/make/data/tzdata/asia	Thu May 31 12:25:23 2018 -0700
+++ b/make/data/tzdata/asia	Tue Jun 05 02:17:36 2018 -0700
@@ -2006,6 +2006,19 @@
 # There is no common English-language abbreviation for this time zone.
 # Use KST, as that's what we already use for 1954-1961 in ROK.
 
+# From Kang Seonghoon (2018-04-29):
+# North Korea will revert its time zone from UTC+8:30 (PYT; Pyongyang
+# Time) back to UTC+9 (KST; Korea Standard Time).
+#
+# From Seo Sanghyeon (2018-04-30):
+# Rodong Sinmun 2018-04-30 announced Pyongyang Time transition plan.
+# https://www.nknews.org/kcna/wp-content/uploads/sites/5/2018/04/rodong-2018-04-30.pdf
+# ... the transition date is 2018-05-05 ...  Citation should be Decree
+# No. 2232 of April 30, 2018, of the Presidium of the Supreme People's
+# Assembly, as published in Rodong Sinmun.
+# From Tim Parenti (2018-04-29):
+# It appears to be the front page story at the top in the right-most column.
+
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Seoul	8:27:52	-	LMT	1908 Apr  1
 			8:30	-	KST	1912 Jan  1
@@ -2017,7 +2030,8 @@
 			8:30	-	KST	1912 Jan  1
 			9:00	-	JST	1945 Aug 24
 			9:00	-	KST	2015 Aug 15 00:00
-			8:30	-	KST
+			8:30	-	KST	2018 May  5
+			9:00	-	KST
 
 ###############################################################################
 
@@ -2681,7 +2695,7 @@
 # From Sharef Mustafa (2018-03-16):
 # Palestine summer time will start on Mar 24th 2018 by advancing the
 # clock by 60 minutes as per Palestinian cabinet decision published on
-# the offical website, though the decree did not specify the exact
+# the official website, though the decree did not specify the exact
 # time of the time shift.
 # http://www.palestinecabinet.gov.ps/Website/AR/NDecrees/ViewFile.ashx?ID=e7a42ab7-ee23-435a-b9c8-a4f7e81f3817
 #
--- a/make/data/tzdata/australasia	Thu May 31 12:25:23 2018 -0700
+++ b/make/data/tzdata/australasia	Tue Jun 05 02:17:36 2018 -0700
@@ -1108,6 +1108,15 @@
 # (1999-09-27) writes that Giles Meteorological Station uses
 # South Australian time even though it's located in Western Australia.
 
+# From Paul Eggert (2018-04-01):
+# The Guardian Express of Perth, Australia reported today that the
+# government decided to advance the clocks permanently on January 1,
+# 2019, from UT +08 to UT +09.  The article noted that an exemption
+# would be made for people aged 61 and over, who "can apply in writing
+# to have the extra hour of sunshine removed from their area."  See:
+# Daylight saving coming to WA in 2019. Guardian Express. 2018-04-01.
+# https://www.communitynews.com.au/guardian-express/news/exclusive-daylight-savings-coming-wa-summer-2018/
+
 # Queensland
 
 # From Paul Eggert (2018-02-26):
--- a/make/data/tzdata/europe	Thu May 31 12:25:23 2018 -0700
+++ b/make/data/tzdata/europe	Tue Jun 05 02:17:36 2018 -0700
@@ -551,13 +551,13 @@
 # summer and negative daylight saving time in winter.  It is for when
 # negative SAVE values are used.
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
-#Rule	Eire	1971	only	-	Oct	31	 2:00u	-1:00	GMT
-#Rule	Eire	1972	1980	-	Mar	Sun>=16	 2:00u	0	IST
-#Rule	Eire	1972	1980	-	Oct	Sun>=23	 2:00u	-1:00	GMT
-#Rule	Eire	1981	max	-	Mar	lastSun	 1:00u	0	IST
-#Rule	Eire	1981	1989	-	Oct	Sun>=23	 1:00u	-1:00	GMT
-#Rule	Eire	1990	1995	-	Oct	Sun>=22	 1:00u	-1:00	GMT
-#Rule	Eire	1996	max	-	Oct	lastSun	 1:00u	-1:00	GMT
+#Rule	Eire	1971	only	-	Oct	31	 2:00u	-1:00	-
+#Rule	Eire	1972	1980	-	Mar	Sun>=16	 2:00u	0	-
+#Rule	Eire	1972	1980	-	Oct	Sun>=23	 2:00u	-1:00	-
+#Rule	Eire	1981	max	-	Mar	lastSun	 1:00u	0	-
+#Rule	Eire	1981	1989	-	Oct	Sun>=23	 1:00u	-1:00	-
+#Rule	Eire	1990	1995	-	Oct	Sun>=22	 1:00u	-1:00	-
+#Rule	Eire	1996	max	-	Oct	lastSun	 1:00u	-1:00	-
 
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Dublin	-0:25:00 -	LMT	1880 Aug  2
@@ -993,18 +993,30 @@
 # Please see the 'asia' file for Asia/Nicosia.
 
 # Czech Republic / Czechia
+#
+# From Paul Eggert (2018-04-15):
+# The source for Czech data is: Kdy začíná a končí letní čas. 2018-04-15.
+# https://kalendar.beda.cz/kdy-zacina-a-konci-letni-cas
+# We know of no English-language name for historical Czech winter time;
+# abbreviate it as "GMT", as it happened to be GMT.
+#
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
-Rule	Czech	1945	only	-	Apr	 8	2:00s	1:00	S
-Rule	Czech	1945	only	-	Nov	18	2:00s	0	-
+Rule	Czech	1945	only	-	Apr	Mon>=1	2:00s	1:00	S
+Rule	Czech	1945	only	-	Oct	 1	2:00s	0	-
 Rule	Czech	1946	only	-	May	 6	2:00s	1:00	S
 Rule	Czech	1946	1949	-	Oct	Sun>=1	2:00s	0	-
-Rule	Czech	1947	only	-	Apr	20	2:00s	1:00	S
-Rule	Czech	1948	only	-	Apr	18	2:00s	1:00	S
+Rule	Czech	1947	1948	-	Apr	Sun>=15	2:00s	1:00	S
 Rule	Czech	1949	only	-	Apr	 9	2:00s	1:00	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Prague	0:57:44 -	LMT	1850
 			0:57:44	-	PMT	1891 Oct    # Prague Mean Time
-			1:00	C-Eur	CE%sT	1944 Sep 17  2:00s
+			1:00	C-Eur	CE%sT	1945 May  9
+			1:00	Czech	CE%sT	1946 Dec  1  3:00
+# Vanguard section, for zic and other parsers that support negative DST.
+#			1:00	-1:00	GMT	1947 Feb 23  2:00
+# Rearguard section, for parsers that do not support negative DST.
+			0:00	-	GMT	1947 Feb 23  2:00
+# End of rearguard section.
 			1:00	Czech	CE%sT	1979
 			1:00	EU	CE%sT
 # Use Europe/Prague also for Slovakia.
@@ -2039,7 +2051,7 @@
 Rule	Neth	1945	only	-	Apr	 2	2:00s	1:00	S
 Rule	Neth	1945	only	-	Sep	16	2:00s	0	-
 #
-# Amsterdam Mean Time was +00:19:32.13 exactly, but the .13 is omitted
+# Amsterdam Mean Time was +00:19:32.13, but the .13 is omitted
 # below because the current format requires GMTOFF to be an integer.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone Europe/Amsterdam	0:19:32 -	LMT	1835
--- a/test/sun/util/calendar/zi/tzdata/VERSION	Thu May 31 12:25:23 2018 -0700
+++ b/test/sun/util/calendar/zi/tzdata/VERSION	Tue Jun 05 02:17:36 2018 -0700
@@ -21,4 +21,4 @@
 # or visit www.oracle.com if you need additional information or have any
 # questions.
 #
-tzdata2018d
+tzdata2018e
--- a/test/sun/util/calendar/zi/tzdata/africa	Thu May 31 12:25:23 2018 -0700
+++ b/test/sun/util/calendar/zi/tzdata/africa	Tue Jun 05 02:17:36 2018 -0700
@@ -29,7 +29,7 @@
 # tz@iana.org for general use in the future).  For more, please see
 # the file CONTRIBUTING in the tz distribution.
 
-# From Paul Eggert (2017-02-20):
+# From Paul Eggert (2017-04-09):
 #
 # Unless otherwise specified, the source for data through 1990 is:
 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
@@ -75,7 +75,7 @@
 # cannot now come up with solid citations.
 #
 # I invented the following abbreviations; corrections are welcome!
-#	 +02	WAST	West Africa Summer Time
+#	 +02	WAST	West Africa Summer Time (no longer used)
 #	 +03	CAST	Central Africa Summer Time (no longer used)
 #	 +03	SAST	South Africa Summer Time (no longer used)
 #	 +03	EAT	East Africa Time
@@ -990,6 +990,10 @@
 # commence at OOhOO on Monday 21 March 1994 and shall end at 02h00 on
 # Sunday 4 September 1994.
 
+# From Michael Deckers (2017-04-06):
+# ... both summer and winter time are called "standard"
+# (which differs from the use in Ireland) ...
+
 # From Petronella Sibeene (2007-03-30):
 # http://allafrica.com/stories/200703300178.html
 # While the entire country changes its time, Katima Mulilo and other
@@ -1015,19 +1019,42 @@
 # the same time they would normally start DST, the first Sunday in September:
 # https://www.timeanddate.com/news/time/namibia-new-time-zone.html
 
+# From Paul Eggert (2017-04-09):
+# Before the change, summer and winter time were both standard time legally.
+# However in common parlance, winter time was considered to be DST.  See, e.g.:
+# http://www.nbc.na/news/namibias-winter-time-could-be-scrapped.2706
+# https://zone.my.na/news/times-are-changing-in-namibia
+# https://www.newera.com.na/2017/02/23/namibias-winter-time-might-be-repealed/
+# Use plain "WAT" and "CAT" for the time zone abbreviations, to be compatible
+# with Namibia's neighbors.
+
 # RULE	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
-Rule	Namibia	1994	only	-	Mar	21	0:00	0	-
-Rule	Namibia	1994	2016	-	Sep	Sun>=1	2:00	1:00	S
-Rule	Namibia	1995	2017	-	Apr	Sun>=1	2:00	0	-
+# Vanguard section, for zic and other parsers that support negative DST.
+#Rule	Namibia	1994	only	-	Mar	21	0:00	-1:00	WAT
+#Rule	Namibia	1994	2017	-	Sep	Sun>=1	2:00	0	CAT
+#Rule	Namibia	1995	2017	-	Apr	Sun>=1	2:00	-1:00	WAT
+# Rearguard section, for parsers that do not support negative DST.
+Rule	Namibia	1994	only	-	Mar	21	0:00	0	WAT
+Rule	Namibia	1994	2017	-	Sep	Sun>=1	2:00	1:00	CAT
+Rule	Namibia	1995	2017	-	Apr	Sun>=1	2:00	0	WAT
+# End of rearguard section.
+
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Windhoek	1:08:24 -	LMT	1892 Feb 8
 			1:30	-	+0130	1903 Mar
 			2:00	-	SAST	1942 Sep 20  2:00
 			2:00	1:00	SAST	1943 Mar 21  2:00
 			2:00	-	SAST	1990 Mar 21 # independence
+# Vanguard section, for zic and other parsers that support negative DST.
+#			2:00	Namibia	%s
+# Rearguard section, for parsers that do not support negative DST.
 			2:00	-	CAT	1994 Mar 21  0:00
-			1:00	Namibia	WA%sT	2017 Sep  3  2:00
+# From Paul Eggert (2017-04-07):
+# The official date of the 2017 rule change was 2017-10-24.  See:
+# http://www.lac.org.na/laws/annoSTAT/Namibian%20Time%20Act%209%20of%202017.pdf
+			1:00	Namibia	%s	2017 Oct 24
 			2:00	-	CAT
+# End of rearguard section.
 
 # Niger
 # See Africa/Lagos.
--- a/test/sun/util/calendar/zi/tzdata/asia	Thu May 31 12:25:23 2018 -0700
+++ b/test/sun/util/calendar/zi/tzdata/asia	Tue Jun 05 02:17:36 2018 -0700
@@ -2006,6 +2006,19 @@
 # There is no common English-language abbreviation for this time zone.
 # Use KST, as that's what we already use for 1954-1961 in ROK.
 
+# From Kang Seonghoon (2018-04-29):
+# North Korea will revert its time zone from UTC+8:30 (PYT; Pyongyang
+# Time) back to UTC+9 (KST; Korea Standard Time).
+#
+# From Seo Sanghyeon (2018-04-30):
+# Rodong Sinmun 2018-04-30 announced Pyongyang Time transition plan.
+# https://www.nknews.org/kcna/wp-content/uploads/sites/5/2018/04/rodong-2018-04-30.pdf
+# ... the transition date is 2018-05-05 ...  Citation should be Decree
+# No. 2232 of April 30, 2018, of the Presidium of the Supreme People's
+# Assembly, as published in Rodong Sinmun.
+# From Tim Parenti (2018-04-29):
+# It appears to be the front page story at the top in the right-most column.
+
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Seoul	8:27:52	-	LMT	1908 Apr  1
 			8:30	-	KST	1912 Jan  1
@@ -2017,7 +2030,8 @@
 			8:30	-	KST	1912 Jan  1
 			9:00	-	JST	1945 Aug 24
 			9:00	-	KST	2015 Aug 15 00:00
-			8:30	-	KST
+			8:30	-	KST	2018 May  5
+			9:00	-	KST
 
 ###############################################################################
 
@@ -2681,7 +2695,7 @@
 # From Sharef Mustafa (2018-03-16):
 # Palestine summer time will start on Mar 24th 2018 by advancing the
 # clock by 60 minutes as per Palestinian cabinet decision published on
-# the offical website, though the decree did not specify the exact
+# the official website, though the decree did not specify the exact
 # time of the time shift.
 # http://www.palestinecabinet.gov.ps/Website/AR/NDecrees/ViewFile.ashx?ID=e7a42ab7-ee23-435a-b9c8-a4f7e81f3817
 #
--- a/test/sun/util/calendar/zi/tzdata/australasia	Thu May 31 12:25:23 2018 -0700
+++ b/test/sun/util/calendar/zi/tzdata/australasia	Tue Jun 05 02:17:36 2018 -0700
@@ -1108,6 +1108,15 @@
 # (1999-09-27) writes that Giles Meteorological Station uses
 # South Australian time even though it's located in Western Australia.
 
+# From Paul Eggert (2018-04-01):
+# The Guardian Express of Perth, Australia reported today that the
+# government decided to advance the clocks permanently on January 1,
+# 2019, from UT +08 to UT +09.  The article noted that an exemption
+# would be made for people aged 61 and over, who "can apply in writing
+# to have the extra hour of sunshine removed from their area."  See:
+# Daylight saving coming to WA in 2019. Guardian Express. 2018-04-01.
+# https://www.communitynews.com.au/guardian-express/news/exclusive-daylight-savings-coming-wa-summer-2018/
+
 # Queensland
 
 # From Paul Eggert (2018-02-26):
--- a/test/sun/util/calendar/zi/tzdata/europe	Thu May 31 12:25:23 2018 -0700
+++ b/test/sun/util/calendar/zi/tzdata/europe	Tue Jun 05 02:17:36 2018 -0700
@@ -551,13 +551,13 @@
 # summer and negative daylight saving time in winter.  It is for when
 # negative SAVE values are used.
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
-#Rule	Eire	1971	only	-	Oct	31	 2:00u	-1:00	GMT
-#Rule	Eire	1972	1980	-	Mar	Sun>=16	 2:00u	0	IST
-#Rule	Eire	1972	1980	-	Oct	Sun>=23	 2:00u	-1:00	GMT
-#Rule	Eire	1981	max	-	Mar	lastSun	 1:00u	0	IST
-#Rule	Eire	1981	1989	-	Oct	Sun>=23	 1:00u	-1:00	GMT
-#Rule	Eire	1990	1995	-	Oct	Sun>=22	 1:00u	-1:00	GMT
-#Rule	Eire	1996	max	-	Oct	lastSun	 1:00u	-1:00	GMT
+#Rule	Eire	1971	only	-	Oct	31	 2:00u	-1:00	-
+#Rule	Eire	1972	1980	-	Mar	Sun>=16	 2:00u	0	-
+#Rule	Eire	1972	1980	-	Oct	Sun>=23	 2:00u	-1:00	-
+#Rule	Eire	1981	max	-	Mar	lastSun	 1:00u	0	-
+#Rule	Eire	1981	1989	-	Oct	Sun>=23	 1:00u	-1:00	-
+#Rule	Eire	1990	1995	-	Oct	Sun>=22	 1:00u	-1:00	-
+#Rule	Eire	1996	max	-	Oct	lastSun	 1:00u	-1:00	-
 
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Dublin	-0:25:00 -	LMT	1880 Aug  2
@@ -993,18 +993,30 @@
 # Please see the 'asia' file for Asia/Nicosia.
 
 # Czech Republic / Czechia
+#
+# From Paul Eggert (2018-04-15):
+# The source for Czech data is: Kdy začíná a končí letní čas. 2018-04-15.
+# https://kalendar.beda.cz/kdy-zacina-a-konci-letni-cas
+# We know of no English-language name for historical Czech winter time;
+# abbreviate it as "GMT", as it happened to be GMT.
+#
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
-Rule	Czech	1945	only	-	Apr	 8	2:00s	1:00	S
-Rule	Czech	1945	only	-	Nov	18	2:00s	0	-
+Rule	Czech	1945	only	-	Apr	Mon>=1	2:00s	1:00	S
+Rule	Czech	1945	only	-	Oct	 1	2:00s	0	-
 Rule	Czech	1946	only	-	May	 6	2:00s	1:00	S
 Rule	Czech	1946	1949	-	Oct	Sun>=1	2:00s	0	-
-Rule	Czech	1947	only	-	Apr	20	2:00s	1:00	S
-Rule	Czech	1948	only	-	Apr	18	2:00s	1:00	S
+Rule	Czech	1947	1948	-	Apr	Sun>=15	2:00s	1:00	S
 Rule	Czech	1949	only	-	Apr	 9	2:00s	1:00	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Prague	0:57:44 -	LMT	1850
 			0:57:44	-	PMT	1891 Oct    # Prague Mean Time
-			1:00	C-Eur	CE%sT	1944 Sep 17  2:00s
+			1:00	C-Eur	CE%sT	1945 May  9
+			1:00	Czech	CE%sT	1946 Dec  1  3:00
+# Vanguard section, for zic and other parsers that support negative DST.
+#			1:00	-1:00	GMT	1947 Feb 23  2:00
+# Rearguard section, for parsers that do not support negative DST.
+			0:00	-	GMT	1947 Feb 23  2:00
+# End of rearguard section.
 			1:00	Czech	CE%sT	1979
 			1:00	EU	CE%sT
 # Use Europe/Prague also for Slovakia.
@@ -2039,7 +2051,7 @@
 Rule	Neth	1945	only	-	Apr	 2	2:00s	1:00	S
 Rule	Neth	1945	only	-	Sep	16	2:00s	0	-
 #
-# Amsterdam Mean Time was +00:19:32.13 exactly, but the .13 is omitted
+# Amsterdam Mean Time was +00:19:32.13, but the .13 is omitted
 # below because the current format requires GMTOFF to be an integer.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone Europe/Amsterdam	0:19:32 -	LMT	1835