Update tzdata and zoneinfo to version 2018c.

Author: GitHub Actions

tzdata/NEWS

@@ -1,15 +1,49 @@
 News for the tz database
 
+Release 2018c - 2018-01-22 23:00:44 -0800
+
+  Briefly:
+  Revert Irish changes that relied on negative DST offsets.
+
+  Changes to tm_isdst
+
+    Revert the 2018a change to Europe/Dublin.  As before, this change
+    does not affect UT offsets or abbreviations; it affects only
+    whether timestamps are considered to be standard time or
+    daylight-saving time, as expressed in the tm_isdst flag of C's
+    struct tm type.  This reversion is intended to be a temporary
+    workaround for problems discovered with downstream uses of
+    releases 2018a and 2018b, which implemented Irish time by using
+    negative DST offsets in the Eire rules of the 'europe' file.
+    Although negative DST offsets have been part of tzcode for many
+    years and are supported by many platforms, they were not
+    documented before 2018a and ICU and OpenJDK do not currently
+    support them.  A mechanism to export data to platforms lacking
+    support for negative DST is planned to be developed before the
+    change is reapplied.  (Problems reported by Deborah Goldsmith and
+    Stephen Colebourne.)
+
+  Changes to past time stamps
+
+    Japanese DST transitions (1948-1951) were Sundays at 00:00, not
+    Saturdays or Sundays at 02:00.  (Thanks to Takayuki Nikai.)
+
+  Changes to build procedure
+
+    The build procedure now works around mawk 1.3.3's lack of support
+    for character class expressions.  (Problem reported by Ohyama.)
+
+
 Release 2018b - 2018-01-17 23:24:48 -0800
 
   Briefly:
   Fix a packaging problem in tz2018a, which was missing 'pacificnew'.
 
   Changes to build procedure
 
-     The distribution now contains the file 'pacificnew' again.
-     This file was inadvertantly omitted in the 2018a distribution.
-     (Problem reported by Matias Fonzo.)
+    The distribution now contains the file 'pacificnew' again.
+    This file was inadvertantly omitted in the 2018a distribution.
+    (Problem reported by Matias Fonzo.)
 
 
 Release 2018a - 2018-01-12 22:29:21 -0800

tzdata/asia

@@ -1464,17 +1464,17 @@ Zone	Asia/Jerusalem	2:20:54 -	LMT	1880
 # of the Japanese wanted to scrap daylight-saving time, as opposed to 30% who
 # wanted to keep it.)
 
-# From Paul Eggert (2006-03-22):
-# Shanks & Pottenger write that DST in Japan during those years was as follows:
+# From Takayuki Nikai (2018-01-19):
+# The source of information is Japanese law.
+# http://www.shugiin.go.jp/internet/itdb_housei.nsf/html/houritsu/00219480428029.htm
+# http://www.shugiin.go.jp/internet/itdb_housei.nsf/html/houritsu/00719500331039.htm
+# ... In summary, it is written as follows.  From 24:00 on the first Saturday
+# in May, until 0:00 on the day after the second Saturday in September.
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
-Rule	Japan	1948	only	-	May	Sun>=1	2:00	1:00	D
-Rule	Japan	1948	1951	-	Sep	Sat>=8	2:00	0	S
-Rule	Japan	1949	only	-	Apr	Sun>=1	2:00	1:00	D
-Rule	Japan	1950	1951	-	May	Sun>=1	2:00	1:00	D
-# but the only locations using it (for birth certificates, presumably, since
-# their audience is astrologers) were US military bases.  For now, assume
-# that for most purposes daylight-saving time was observed; otherwise, what
-# would have been the point of the 1951 poll?
+Rule	Japan	1948	only	-	May	Sat>=1	24:00	1:00	D
+Rule	Japan	1948	1951	-	Sep	Sun>=9	 0:00	0	S
+Rule	Japan	1949	only	-	Apr	Sat>=1	24:00	1:00	D
+Rule	Japan	1950	1951	-	May	Sat>=1	24:00	1:00	D
 
 # From Hideyuki Suzuki (1998-11-09):
 # 'Tokyo' usually stands for the former location of Tokyo Astronomical

tzdata/europe

@@ -508,16 +508,19 @@ Link	Europe/London	Europe/Jersey
 Link	Europe/London	Europe/Guernsey
 Link	Europe/London	Europe/Isle_of_Man
 
+# From Paul Eggert (2018-01-19):
 # The following is like GB-Eire and EU, except with standard time in
 # summer and negative daylight saving time in winter.
+# Although currently commented out, this will need to become uncommented
+# once the ICU/OpenJDK workaround is removed; see below.
 # 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	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
 
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Europe/Dublin	-0:25:00 -	LMT	1880 Aug  2
@@ -530,7 +533,25 @@ Zone	Europe/Dublin	-0:25:00 -	LMT	1880 Aug  2
 			 0:00	1:00	IST	1947 Nov  2  2:00s
 			 0:00	-	GMT	1948 Apr 18  2:00s
 			 0:00	GB-Eire	GMT/IST	1968 Oct 27
-			 1:00	Eire	IST/GMT
+# From Paul Eggert (2018-01-18):
+# The next line should look like this:
+#			 1:00	Eire	IST/GMT
+# However, in January 2018 we discovered that the Eire rules cause
+# problems with tests for ICU:
+# https://mm.icann.org/pipermail/tz/2018-January/025825.html
+# and with tests for OpenJDK:
+# https://mm.icann.org/pipermail/tz/2018-January/025822.html
+# To work around this problem, use a traditional approximation for
+# time stamps after 1971-10-31 02:00 UTC, to give ICU and OpenJDK
+# developers breathing room to fix bugs.  This approximation has
+# correct UTC offsets, but results in tm_isdst flags are the reverse
+# of what they should be.  This workaround is temporary and should be
+# removed reasonably soon.
+			 1:00	-	IST	1971 Oct 31  2:00u
+			 0:00	GB-Eire	GMT/IST	1996
+			 0:00	EU	GMT/IST
+# End of workaround for ICU and OpenJDK bugs.
+
 
 ###############################################################################
 

tzdata/version

@@ -1 +1 @@
-2018b
+2018c

tzdata/zishrink.awk

@@ -37,7 +37,7 @@ function process_input_line(line, field, end, i, n, startdef)
   # Remove comments, normalize spaces, and append a space to each line.
   sub(/#.*/, "", line)
   line = line " "
-  gsub(/[[:space:]]+/, " ", line)
+  gsub(/[\f\r\t\v ]+/, " ", line)
 
   # Abbreviate keywords.  Do not abbreviate "Link" to just "L",
   # as pre-2017c zic erroneously diagnoses "Li" as ambiguous.
@@ -94,7 +94,7 @@ function process_input_line(line, field, end, i, n, startdef)
   sub(/ 0+$/, "", line)
 
   # Remove unnecessary trailing days-of-month "1".
-  if (match(line, /[[:alpha:]] 1$/))
+  if (match(line, /[A-Za-z] 1$/))
     line = substr(line, 1, RSTART)
 
   # Remove unnecessary trailing " Ja" (for January).
@@ -148,7 +148,7 @@ BEGIN {
   print "# This zic input file is in the public domain."
 }
 
-/^[[:space:]]*[^#[:space:]]/ {
+/^[\f\r\t\v ]*[^#\f\r\t\v ]/ {
   process_input_line($0)
 }
 

zoneinfo/Asia/Tokyo.ics

@@ -2,8 +2,8 @@ BEGIN:VCALENDAR
 PRODID:-//github.com/libical/vzic//NONSGML ICS//EN
 VERSION:2.0
 BEGIN:VTIMEZONE
-TZID:/github.com/libical/tzdbics/20221031_2017a/Asia/Tokyo
-LAST-MODIFIED:20221031T170926Z
+TZID:/github.com/libical/tzdbics/20221031_2018c/Asia/Tokyo
+LAST-MODIFIED:20221031T171445Z
 X-LIC-LOCATION:Asia/Tokyo
 X-PROLEPTIC-TZNAME:LMT
 BEGIN:STANDARD
@@ -16,22 +16,22 @@ BEGIN:DAYLIGHT
 TZNAME:JDT
 TZOFFSETFROM:+0900
 TZOFFSETTO:+1000
-DTSTART:19480502T020000
-RDATE:19490403T020000
+DTSTART:19480502T000000
+RDATE:19490403T000000
 END:DAYLIGHT
 BEGIN:STANDARD
 TZNAME:JST
 TZOFFSETFROM:+1000
 TZOFFSETTO:+0900
-DTSTART:19480911T020000
-RRULE:FREQ=YEARLY;BYMONTH=9;BYDAY=2SA;UNTIL=19510907T160000Z
+DTSTART:19480912T000000
+RRULE:FREQ=YEARLY;BYMONTH=9;BYMONTHDAY=9,10,11,12,13,14,15;BYDAY=SU;UNTIL=19510908T140000Z
 END:STANDARD
 BEGIN:DAYLIGHT
 TZNAME:JDT
 TZOFFSETFROM:+0900
 TZOFFSETTO:+1000
-DTSTART:19500507T020000
-RRULE:FREQ=YEARLY;BYMONTH=5;BYDAY=1SU;UNTIL=19510505T170000Z
+DTSTART:19500507T000000
+RRULE:FREQ=YEARLY;BYMONTH=5;BYMONTHDAY=2,3,4,5,6,7,8;BYDAY=SU;UNTIL=19510505T150000Z
 END:DAYLIGHT
 END:VTIMEZONE
 END:VCALENDAR

zoneinfo/Europe/Dublin.ics

@@ -2,8 +2,8 @@ BEGIN:VCALENDAR
 PRODID:-//github.com/libical/vzic//NONSGML ICS//EN
 VERSION:2.0
 BEGIN:VTIMEZONE
-TZID:/github.com/libical/tzdbics/20221031_2018a/Europe/Dublin
-LAST-MODIFIED:20221031T171244Z
+TZID:/github.com/libical/tzdbics/20221031_2018c/Europe/Dublin
+LAST-MODIFIED:20221031T171445Z
 X-LIC-LOCATION:Europe/Dublin
 X-PROLEPTIC-TZNAME:LMT
 BEGIN:STANDARD
@@ -49,12 +49,14 @@ RDATE:19461006T030000
 RDATE:19471102T030000
 RDATE:19481031T030000
 RDATE:19491030T030000
+RDATE:19711031T030000
 END:STANDARD
 BEGIN:STANDARD
 TZNAME:GMT
 TZOFFSETFROM:+0000
 TZOFFSETTO:+0000
 DTSTART:19211206T000000
+RDATE:19960101T000000
 END:STANDARD
 BEGIN:DAYLIGHT
 TZNAME:IST
@@ -185,52 +187,46 @@ TZOFFSETTO:+0100
 DTSTART:19681027T000000
 END:STANDARD
 BEGIN:DAYLIGHT
-TZNAME:GMT
-TZOFFSETFROM:+0100
-TZOFFSETTO:+0000
-DTSTART:19711031T030000
-END:DAYLIGHT
-BEGIN:STANDARD
 TZNAME:IST
 TZOFFSETFROM:+0000
 TZOFFSETTO:+0100
 DTSTART:19720319T020000
 RRULE:FREQ=YEARLY;BYMONTH=3;BYMONTHDAY=16,17,18,19,20,21,22;BYDAY=SU;UNTIL=19800316T020000Z
-END:STANDARD
-BEGIN:DAYLIGHT
+END:DAYLIGHT
+BEGIN:STANDARD
 TZNAME:GMT
 TZOFFSETFROM:+0100
 TZOFFSETTO:+0000
 DTSTART:19721029T030000
 RRULE:FREQ=YEARLY;BYMONTH=10;BYMONTHDAY=23,24,25,26,27,28,29;BYDAY=SU;UNTIL=19801026T020000Z
-END:DAYLIGHT
-BEGIN:STANDARD
+END:STANDARD
+BEGIN:DAYLIGHT
 TZNAME:IST
 TZOFFSETFROM:+0000
 TZOFFSETTO:+0100
 DTSTART:19810329T010000
 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
-END:STANDARD
-BEGIN:DAYLIGHT
+END:DAYLIGHT
+BEGIN:STANDARD
 TZNAME:GMT
 TZOFFSETFROM:+0100
 TZOFFSETTO:+0000
 DTSTART:19811025T020000
 RRULE:FREQ=YEARLY;BYMONTH=10;BYMONTHDAY=23,24,25,26,27,28,29;BYDAY=SU;UNTIL=19891029T010000Z
-END:DAYLIGHT
-BEGIN:DAYLIGHT
+END:STANDARD
+BEGIN:STANDARD
 TZNAME:GMT
 TZOFFSETFROM:+0100
 TZOFFSETTO:+0000
 DTSTART:19901028T020000
 RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=4SU;UNTIL=19951022T010000Z
-END:DAYLIGHT
-BEGIN:DAYLIGHT
+END:STANDARD
+BEGIN:STANDARD
 TZNAME:GMT
 TZOFFSETFROM:+0100
 TZOFFSETTO:+0000
 DTSTART:19961027T020000
 RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
-END:DAYLIGHT
+END:STANDARD
 END:VTIMEZONE
 END:VCALENDAR