+# Copyright (C) 2016 and later: Unicode, Inc. and others.
+# License & terms of use: http://www.unicode.org/copyright.html
######################################################################
-# Copyright (C) 2007-2008, International Business Machines
+# Copyright (C) 2007-2014, International Business Machines
# Corporation and others. All Rights Reserved.
######################################################################
# This is an ICU-specific file with the same format as regular
# Zone NAME GMTOFF RULES FORMAT
Zone Etc/Unknown 0 - Unknown
-# Add SystemV/XXX time zones as aliases according to CLDR.
+# SystemV time zones.
# The Olson systemv file has these commented out.
-# An alternative to making these aliases according to CLDR would be
-# to copy and un-comment the data from the systemv file.
-
-# Link canonical alias
-Link America/Halifax SystemV/AST4ADT
-Link America/New_York SystemV/EST5EDT
-Link America/Chicago SystemV/CST6CDT
-Link America/Denver SystemV/MST7MDT
-Link America/Los_Angeles SystemV/PST8PDT
-Link America/Anchorage SystemV/YST9YDT
-Link Etc/GMT+4 SystemV/AST4
-Link Etc/GMT+5 SystemV/EST5
-Link Etc/GMT+6 SystemV/CST6
-Link Etc/GMT+7 SystemV/MST7
-Link Etc/GMT+8 SystemV/PST8
-Link Etc/GMT+9 SystemV/YST9
-Link Etc/GMT+10 SystemV/HST10
+
+# Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
+Zone SystemV/AST4ADT -4:00 SystemV A%sT
+Zone SystemV/EST5EDT -5:00 SystemV E%sT
+Zone SystemV/CST6CDT -6:00 SystemV C%sT
+Zone SystemV/MST7MDT -7:00 SystemV M%sT
+Zone SystemV/PST8PDT -8:00 SystemV P%sT
+Zone SystemV/YST9YDT -9:00 SystemV Y%sT
+Zone SystemV/AST4 -4:00 - AST
+Zone SystemV/EST5 -5:00 - EST
+Zone SystemV/CST6 -6:00 - CST
+Zone SystemV/MST7 -7:00 - MST
+Zone SystemV/PST8 -8:00 - PST
+Zone SystemV/YST9 -9:00 - YST
+Zone SystemV/HST10 -10:00 - HST
# The list below is for supporting legacy ICU zone aliases.
Link America/Anchorage AST
Link America/Sao_Paulo BET
Link Asia/Dhaka BST
-Link Africa/Harare CAT
+Link Africa/Maputo CAT
Link America/St_Johns CNT
Link America/Chicago CST
Link Asia/Shanghai CTT
Link Pacific/Guadalcanal SST
#Link Etc/UTC UTC # Olson LINK
Link Asia/Ho_Chi_Minh VST
+
+#
+# Aliases already dropped from the TZ database.
+# ICU may also remove these aliases.
+#
+Link America/Regina Canada/East-Saskatchewan # removed from backward in 2017c
+
+
+# Note:
+# Following section was added for tz database 2018a and 2018b.
+# ICU has a bug handling negative DST, and we also don't want to
+# flip sumer time name and winter time name for Dublin at least for
+# now. Because the change had major impacts to tz database external
+# consumers, the tz database maintainer once reverted the Europe/Dublin
+# rules (same as 2017c or older) in 2018c. The tz database maintainer
+# thinks the changes in 2018a should be brought back when external
+# tz database consumers are ready to adopt the change. We don't know
+# what CLDR TC want to do with this for now. But if tz database brings
+# back the change, and CLDR TC (and ICU TC) want to keep the display name
+# unchanged, then we can uncomment the block below to restore ICU
+# custom override. (Yoshito 2018-01-23)
+
+#
+# tzdata2018a changed Europe/Dublin to use IST (UTC+1) as the standard time
+# of the region, and GMT (UTC) as the daylight saving time with negative
+# offset (-1 hour) in winter. ICU SimpleTimeZone rejects a zone with negative
+# daylight saving time offset. We could remove the restriction in newer version
+# of ICU, but such data does not work well with older ICU runtime without
+# fixing the issue. For now, we define our own Europe/Dubin in ICU, replacing
+# Europe/Dublin data from the tz database.
+#
+
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
+# Rule Eire--ICU 1971 only - Oct 31 2:00u 0 GMT
+# Rule Eire--ICU 1972 1980 - Mar Sun>=16 2:00u 1:00 IST
+# Rule Eire--ICU 1972 1980 - Oct Sun>=23 2:00u 0 GMT
+# Rule Eire--ICU 1981 max - Mar lastSun 1:00u 1:00 IST
+# Rule Eire--ICU 1981 1989 - Oct Sun>=23 1:00u 0 GMT
+# Rule Eire--ICU 1990 1995 - Oct Sun>=22 1:00u 0 GMT
+# Rule Eire--ICU 1996 max - Oct lastSun 1:00u 0 GMT
+
+# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+# Zone Europe/Dublin--ICU -0:25:00 - LMT 1880 Aug 2
+# -0:25:21 - DMT 1916 May 21 2:00s
+# -0:25:21 1:00 IST 1916 Oct 1 2:00s
+# 0:00 GB-Eire %s 1921 Dec 6 # independence
+# 0:00 GB-Eire GMT/IST 1940 Feb 25 2:00s
+# 0:00 1:00 IST 1946 Oct 6 2:00s
+# 0:00 - GMT 1947 Mar 16 2:00s
+# 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
+# 0:00 Eire--ICU GMT/IST
+
+# Link Europe/Dublin--ICU Eire--ICU
+
projects / apple / icu.git / blobdiff