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authorGordon Tetlow <gordon@FreeBSD.org>2020-05-12 16:44:13 +0000
committerGordon Tetlow <gordon@FreeBSD.org>2020-05-12 16:44:13 +0000
commit42a95f3e840a60e38b234c934850b7aeedea08f5 (patch)
tree957fb432f7ea6d5d858e3414b53b669f64c114bd
parentd98e1c62c3d9e9d9b13063d088a6c596f91245b7 (diff)
downloadsrc-42a95f3e840a60e38b234c934850b7aeedea08f5.tar.gz
src-42a95f3e840a60e38b234c934850b7aeedea08f5.zip
Update to tzdata 2020a.
Approved by: so Security: EN-20:08.tzdata
Notes
Notes: svn path=/releng/12.1/; revision=360969
-rw-r--r--contrib/tzdata/Makefile38
-rw-r--r--contrib/tzdata/NEWS82
-rw-r--r--contrib/tzdata/africa54
-rw-r--r--contrib/tzdata/asia212
-rw-r--r--contrib/tzdata/backward1
-rw-r--r--contrib/tzdata/backzone29
-rw-r--r--contrib/tzdata/europe16
-rw-r--r--contrib/tzdata/leap-seconds.list10
-rw-r--r--contrib/tzdata/leapseconds12
-rw-r--r--contrib/tzdata/leapseconds.awk17
-rw-r--r--contrib/tzdata/northamerica48
-rw-r--r--contrib/tzdata/theory.html23
-rw-r--r--contrib/tzdata/version2
-rw-r--r--contrib/tzdata/zone.tab12
-rw-r--r--contrib/tzdata/zone1970.tab12
15 files changed, 421 insertions, 147 deletions
diff --git a/contrib/tzdata/Makefile b/contrib/tzdata/Makefile
index fec0a4f7eb36..610bf199d9a3 100644
--- a/contrib/tzdata/Makefile
+++ b/contrib/tzdata/Makefile
@@ -150,6 +150,15 @@ TIME_T_ALTERNATIVES_TAIL = int32_t uint32_t uint64_t
REDO= posix_right
+# Whether to put an "Expires" line in the leapseconds file.
+# Use EXPIRES_LINE=1 to put the line in, 0 to omit it.
+# The EXPIRES_LINE value matters only if REDO's value contains "right".
+# If you change EXPIRES_LINE, remove the leapseconds file before running "make".
+# zic's support for the Expires line was introduced in tzdb 2020a,
+# and EXPIRES_LINE defaults to 0 for now so that the leapseconds file
+# can be given to older zic implementations.
+EXPIRES_LINE= 0
+
# To install data in text form that has all the information of the TZif data,
# (optionally incorporating leap second information), use
# TZDATA_TEXT= tzdata.zi leapseconds
@@ -295,8 +304,9 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \
# than TM_GMTOFF and TM_ZONE. However, most of them are standardized.
# #
# # To omit or support the external variable "tzname", add one of:
-# # -DHAVE_TZNAME=0
-# # -DHAVE_TZNAME=1
+# # -DHAVE_TZNAME=0 # do not support "tzname"
+# # -DHAVE_TZNAME=1 # support "tzname", which is defined by system library
+# # -DHAVE_TZNAME=2 # support and define "tzname"
# # to the "CFLAGS=" line. "tzname" is required by POSIX 1988 and later.
# # If not defined, the code attempts to guess HAVE_TZNAME from other macros.
# # Warning: unless time_tz is also defined, HAVE_TZNAME=1 can cause
@@ -304,16 +314,20 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \
# # presumably due to memory allocation issues.
# #
# # To omit or support the external variables "timezone" and "daylight", add
-# # -DUSG_COMPAT=0
-# # -DUSG_COMPAT=1
+# # -DUSG_COMPAT=0 # do not support
+# # -DUSG_COMPAT=1 # support, and variables are defined by system library
+# # -DUSG_COMPAT=2 # support and define variables
# # to the "CFLAGS=" line; "timezone" and "daylight" are inspired by
# # Unix Systems Group code and are required by POSIX 2008 (with XSI) and later.
# # If not defined, the code attempts to guess USG_COMPAT from other macros.
# #
# # To support the external variable "altzone", add
-# # -DALTZONE
+# # -DALTZONE=0 # do not support
+# # -DALTZONE=1 # support "altzone", which is defined by system library
+# # -DALTZONE=2 # support and define "altzone"
# # to the end of the "CFLAGS=" line; although "altzone" appeared in
# # System V Release 3.1 it has not been standardized.
+# # If not defined, the code attempts to guess ALTZONE from other macros.
#
# If you want functions that were inspired by early versions of X3J11's work,
# add
@@ -321,9 +335,7 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \
# to the end of the "CFLAGS=" line. This arranges for the functions
# "tzsetwall", "offtime", "timelocal", "timegm", "timeoff",
# "posix2time", and "time2posix" to be added to the time conversion library.
-# "tzsetwall" is like "tzset" except that it arranges for local wall clock
-# time (rather than the timezone specified in the TZ environment variable)
-# to be used.
+# "tzsetwall" is deprecated and is intended to be removed soon; see NEWS.
# "offtime" is like "gmtime" except that it accepts a second (long) argument
# that gives an offset to add to the time_t when converting it.
# "timelocal" is equivalent to "mktime".
@@ -333,7 +345,6 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \
# that gives an offset to use when converting to a time_t.
# "posix2time" and "time2posix" are described in an included manual page.
# X3J11's work does not describe any of these functions.
-# Sun has provided "tzsetwall", "timelocal", and "timegm" in SunOS 4.0.
# These functions may well disappear in future releases of the time
# conversion package.
#
@@ -505,11 +516,11 @@ RANLIB= :
TZCOBJS= zic.o
TZDOBJS= zdump.o localtime.o asctime.o strftime.o
DATEOBJS= date.o localtime.o strftime.o asctime.o
-LIBSRCS= localtime.c asctime.c difftime.c
-LIBOBJS= localtime.o asctime.o difftime.o
+LIBSRCS= localtime.c asctime.c difftime.c strftime.c
+LIBOBJS= localtime.o asctime.o difftime.o strftime.o
HEADERS= tzfile.h private.h
NONLIBSRCS= zic.c zdump.c
-NEWUCBSRCS= date.c strftime.c
+NEWUCBSRCS= date.c
SOURCES= $(HEADERS) $(LIBSRCS) $(NONLIBSRCS) $(NEWUCBSRCS) \
tzselect.ksh workman.sh
MANS= newctime.3 newstrftime.3 newtzset.3 time2posix.3 \
@@ -651,7 +662,8 @@ yearistype: yearistype.sh
chmod +x yearistype
leapseconds: $(LEAP_DEPS)
- $(AWK) -f leapseconds.awk leap-seconds.list >$@.out
+ $(AWK) -v EXPIRES_LINE=$(EXPIRES_LINE) \
+ -f leapseconds.awk leap-seconds.list >$@.out
mv $@.out $@
# Arguments to pass to submakes of install_data.
diff --git a/contrib/tzdata/NEWS b/contrib/tzdata/NEWS
index af0f06f7192d..321e09084190 100644
--- a/contrib/tzdata/NEWS
+++ b/contrib/tzdata/NEWS
@@ -1,5 +1,87 @@
News for the tz database
+Release 2020a - 2020-04-23 16:03:47 -0700
+
+ Briefly:
+ Morocco springs forward on 2020-05-31, not 2020-05-24.
+ Canada's Yukon advanced to -07 year-round on 2020-03-08.
+ America/Nuuk renamed from America/Godthab.
+ zic now supports expiration dates for leap second lists.
+
+ Changes to future timestamps
+
+ Morocco's second spring-forward transition in 2020 will be May 31,
+ not May 24 as predicted earlier. (Thanks to Semlali Naoufal.)
+ Adjust future-year predictions to use the first Sunday after the
+ day after Ramadan, not the first Sunday after Ramadan.
+
+ Canada's Yukon, represented by America/Whitehorse and
+ America/Dawson, advanced to -07 year-round, beginning with its
+ spring-forward transition on 2020-03-08, and will not fall back on
+ 2020-11-01. Although a government press release calls this
+ "permanent Pacific Daylight Saving Time", we prefer MST for
+ consistency with nearby Dawson Creek, Creston, and Fort Nelson.
+ (Thanks to Tim Parenti.)
+
+ Changes to past timestamps
+
+ Shanghai observed DST in 1919. (Thanks to Phake Nick.)
+
+ Changes to timezone identifiers
+
+ To reflect current usage in English better, America/Godthab has
+ been renamed to America/Nuuk. A backwards-compatibility link
+ remains for the old name.
+
+ Changes to code
+
+ localtime.c no longer mishandles timestamps after the last
+ transition in a TZif file with leap seconds and with daylight
+ saving time transitions projected into the indefinite future.
+ For example, with TZ='America/Los_Angeles' with leap seconds,
+ zdump formerly reported a DST transition on 2038-03-14
+ from 01:59:32.999... to 02:59:33 instead of the correct transition
+ from 01:59:59.999... to 03:00:00.
+
+ zic -L now supports an Expires line in the leapseconds file, and
+ truncates the TZif output accordingly. This propagates leap
+ second expiration information into the TZif file, and avoids the
+ abovementioned localtime.c bug as well as similar bugs present in
+ many client implementations. If no Expires line is present, zic
+ -L instead truncates the TZif output based on the #expires comment
+ present in leapseconds files distributed by tzdb 2018f and later;
+ however, this usage is obsolescent. For now, the distributed
+ leapseconds file has an Expires line that is commented out, so
+ that the file can be fed to older versions of zic which ignore the
+ commented-out line. Future tzdb distributions are planned to
+ contain a leapseconds file with an Expires line.
+
+ The configuration macros HAVE_TZNAME and USG_COMPAT should now be
+ set to 1 if the system library supports the feature, and 2 if not.
+ As before, these macros are nonzero if tzcode should support the
+ feature, zero otherwise.
+
+ The configuration macro ALTZONE now has the same values with the
+ same meaning as HAVE_TZNAME and USG_COMPAT.
+
+ The code's defense against CRLF in leap-seconds.list is now
+ portable to POSIX awk. (Problem reported by Deborah Goldsmith.)
+
+ Although the undocumented tzsetwall function is not changed in
+ this release, it is now deprecated in preparation for removal in
+ future releases. Due to POSIX requirements, tzsetwall has not
+ worked for some time. Any code that uses it should instead use
+ tzalloc(NULL) or, if portability trumps thread-safety, should
+ unset the TZ environment variable.
+
+ Changes to commentary
+
+ The Îles-de-la-Madeleine and the Listuguj reserve are noted as
+ following America/Halifax, and comments about Yukon's "south" and
+ "north" have been corrected to say "east" and "west". (Thanks to
+ Jeffery Nichols.)
+
+
Release 2019c - 2019-09-11 08:59:48 -0700
Briefly:
diff --git a/contrib/tzdata/africa b/contrib/tzdata/africa
index feb6017d959b..724744f37723 100644
--- a/contrib/tzdata/africa
+++ b/contrib/tzdata/africa
@@ -867,19 +867,25 @@ Zone Indian/Mauritius 3:50:00 - LMT 1907 # Port Louis
# Morocco will be on GMT starting from Sunday, May 5th 2019 at 3am.
# The switch to GMT+1 will occur on Sunday, June 9th 2019 at 2am....
# http://fr.le360.ma/societe/voici-la-date-du-retour-a-lheure-legale-au-maroc-188222
-#
-# From Paul Eggert (2019-05-20):
-# This agrees with our 2018-11-01 guess that the Moroccan government
-# would continue the practice of falling back at 03:00 the last Sunday
-# before Ramadan, and of springing forward at 02:00 the first Sunday after
-# Ramadan, as this has been the practice since 2012. To implement this,
-# transition dates for 2019 through 2087 were determined by running the
-# following program under GNU Emacs 26.2.
-# (let ((islamic-year 1440))
+
+# From Semlali Naoufal (2020-04-14):
+# Following the announcement by the Moroccan government, the switch to
+# GMT time will take place on Sunday, April 19, 2020 from 3 a.m. and
+# the return to GMT+1 time will take place on Sunday, May 31, 2020 at 2 a.m....
+# https://maroc-diplomatique.net/maroc-le-retour-a-lheure-gmt-est-prevu-dimanche-prochain/
+# http://aujourdhui.ma/actualite/gmt1-retour-a-lheure-normale-dimanche-prochain-1
+#
+# From Paul Eggert (2020-04-14):
+# For now, guess that in the future Morocco will fall back at 03:00
+# the last Sunday before Ramadan, and spring forward at 02:00 the
+# first Sunday after the day after Ramadan. To implement this,
+# transition dates for 2021 through 2087 were determined by running
+# the following program under GNU Emacs 26.3.
+# (let ((islamic-year 1442))
# (require 'cal-islam)
# (while (< islamic-year 1511)
# (let ((a (calendar-islamic-to-absolute (list 9 1 islamic-year)))
-# (b (calendar-islamic-to-absolute (list 10 1 islamic-year)))
+# (b (1+ (calendar-islamic-to-absolute (list 10 1 islamic-year))))
# (sunday 0))
# (while (/= sunday (mod (setq a (1- a)) 7)))
# (while (/= sunday (mod b 7))
@@ -939,7 +945,7 @@ Rule Morocco 2018 only - Jun 17 2:00 1:00 -
Rule Morocco 2019 only - May 5 3:00 -1:00 -
Rule Morocco 2019 only - Jun 9 2:00 0 -
Rule Morocco 2020 only - Apr 19 3:00 -1:00 -
-Rule Morocco 2020 only - May 24 2:00 0 -
+Rule Morocco 2020 only - May 31 2:00 0 -
Rule Morocco 2021 only - Apr 11 3:00 -1:00 -
Rule Morocco 2021 only - May 16 2:00 0 -
Rule Morocco 2022 only - Mar 27 3:00 -1:00 -
@@ -955,7 +961,7 @@ Rule Morocco 2026 only - Mar 22 2:00 0 -
Rule Morocco 2027 only - Feb 7 3:00 -1:00 -
Rule Morocco 2027 only - Mar 14 2:00 0 -
Rule Morocco 2028 only - Jan 23 3:00 -1:00 -
-Rule Morocco 2028 only - Feb 27 2:00 0 -
+Rule Morocco 2028 only - Mar 5 2:00 0 -
Rule Morocco 2029 only - Jan 14 3:00 -1:00 -
Rule Morocco 2029 only - Feb 18 2:00 0 -
Rule Morocco 2029 only - Dec 30 3:00 -1:00 -
@@ -971,7 +977,7 @@ Rule Morocco 2033 only - Dec 25 2:00 0 -
Rule Morocco 2034 only - Nov 5 3:00 -1:00 -
Rule Morocco 2034 only - Dec 17 2:00 0 -
Rule Morocco 2035 only - Oct 28 3:00 -1:00 -
-Rule Morocco 2035 only - Dec 2 2:00 0 -
+Rule Morocco 2035 only - Dec 9 2:00 0 -
Rule Morocco 2036 only - Oct 19 3:00 -1:00 -
Rule Morocco 2036 only - Nov 23 2:00 0 -
Rule Morocco 2037 only - Oct 4 3:00 -1:00 -
@@ -987,7 +993,7 @@ Rule Morocco 2041 only - Sep 29 2:00 0 -
Rule Morocco 2042 only - Aug 10 3:00 -1:00 -
Rule Morocco 2042 only - Sep 21 2:00 0 -
Rule Morocco 2043 only - Aug 2 3:00 -1:00 -
-Rule Morocco 2043 only - Sep 6 2:00 0 -
+Rule Morocco 2043 only - Sep 13 2:00 0 -
Rule Morocco 2044 only - Jul 24 3:00 -1:00 -
Rule Morocco 2044 only - Aug 28 2:00 0 -
Rule Morocco 2045 only - Jul 9 3:00 -1:00 -
@@ -1003,7 +1009,7 @@ Rule Morocco 2049 only - Jul 4 2:00 0 -
Rule Morocco 2050 only - May 15 3:00 -1:00 -
Rule Morocco 2050 only - Jun 26 2:00 0 -
Rule Morocco 2051 only - May 7 3:00 -1:00 -
-Rule Morocco 2051 only - Jun 11 2:00 0 -
+Rule Morocco 2051 only - Jun 18 2:00 0 -
Rule Morocco 2052 only - Apr 28 3:00 -1:00 -
Rule Morocco 2052 only - Jun 2 2:00 0 -
Rule Morocco 2053 only - Apr 13 3:00 -1:00 -
@@ -1019,7 +1025,7 @@ Rule Morocco 2057 only - Apr 8 2:00 0 -
Rule Morocco 2058 only - Feb 17 3:00 -1:00 -
Rule Morocco 2058 only - Mar 31 2:00 0 -
Rule Morocco 2059 only - Feb 9 3:00 -1:00 -
-Rule Morocco 2059 only - Mar 16 2:00 0 -
+Rule Morocco 2059 only - Mar 23 2:00 0 -
Rule Morocco 2060 only - Feb 1 3:00 -1:00 -
Rule Morocco 2060 only - Mar 7 2:00 0 -
Rule Morocco 2061 only - Jan 16 3:00 -1:00 -
@@ -1029,13 +1035,13 @@ Rule Morocco 2062 only - Feb 12 2:00 0 -
Rule Morocco 2062 only - Dec 31 3:00 -1:00 -
Rule Morocco 2063 only - Feb 4 2:00 0 -
Rule Morocco 2063 only - Dec 16 3:00 -1:00 -
-Rule Morocco 2064 only - Jan 20 2:00 0 -
+Rule Morocco 2064 only - Jan 27 2:00 0 -
Rule Morocco 2064 only - Dec 7 3:00 -1:00 -
Rule Morocco 2065 only - Jan 11 2:00 0 -
Rule Morocco 2065 only - Nov 22 3:00 -1:00 -
Rule Morocco 2066 only - Jan 3 2:00 0 -
Rule Morocco 2066 only - Nov 14 3:00 -1:00 -
-Rule Morocco 2066 only - Dec 19 2:00 0 -
+Rule Morocco 2066 only - Dec 26 2:00 0 -
Rule Morocco 2067 only - Nov 6 3:00 -1:00 -
Rule Morocco 2067 only - Dec 11 2:00 0 -
Rule Morocco 2068 only - Oct 21 3:00 -1:00 -
@@ -1045,13 +1051,13 @@ Rule Morocco 2069 only - Nov 17 2:00 0 -
Rule Morocco 2070 only - Oct 5 3:00 -1:00 -
Rule Morocco 2070 only - Nov 9 2:00 0 -
Rule Morocco 2071 only - Sep 20 3:00 -1:00 -
-Rule Morocco 2071 only - Oct 25 2:00 0 -
+Rule Morocco 2071 only - Nov 1 2:00 0 -
Rule Morocco 2072 only - Sep 11 3:00 -1:00 -
Rule Morocco 2072 only - Oct 16 2:00 0 -
Rule Morocco 2073 only - Aug 27 3:00 -1:00 -
Rule Morocco 2073 only - Oct 8 2:00 0 -
Rule Morocco 2074 only - Aug 19 3:00 -1:00 -
-Rule Morocco 2074 only - Sep 23 2:00 0 -
+Rule Morocco 2074 only - Sep 30 2:00 0 -
Rule Morocco 2075 only - Aug 11 3:00 -1:00 -
Rule Morocco 2075 only - Sep 15 2:00 0 -
Rule Morocco 2076 only - Jul 26 3:00 -1:00 -
@@ -1061,7 +1067,7 @@ Rule Morocco 2077 only - Aug 22 2:00 0 -
Rule Morocco 2078 only - Jul 10 3:00 -1:00 -
Rule Morocco 2078 only - Aug 14 2:00 0 -
Rule Morocco 2079 only - Jun 25 3:00 -1:00 -
-Rule Morocco 2079 only - Jul 30 2:00 0 -
+Rule Morocco 2079 only - Aug 6 2:00 0 -
Rule Morocco 2080 only - Jun 16 3:00 -1:00 -
Rule Morocco 2080 only - Jul 21 2:00 0 -
Rule Morocco 2081 only - Jun 1 3:00 -1:00 -
@@ -1077,7 +1083,7 @@ Rule Morocco 2085 only - May 27 2:00 0 -
Rule Morocco 2086 only - Apr 14 3:00 -1:00 -
Rule Morocco 2086 only - May 19 2:00 0 -
Rule Morocco 2087 only - Mar 30 3:00 -1:00 -
-Rule Morocco 2087 only - May 4 2:00 0 -
+Rule Morocco 2087 only - May 11 2:00 0 -
# For dates after the somewhat-arbitrary cutoff of 2087, assume that
# Morocco will no longer observe DST. At some point this table will
# need to be extended, though quite possibly Morocco will change the
@@ -1179,7 +1185,7 @@ Link Africa/Maputo Africa/Lusaka # Zambia
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.
+# Rearguard section, for parsers lacking negative DST; see ziguard.awk.
#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
@@ -1193,7 +1199,7 @@ Zone Africa/Windhoek 1:08:24 - LMT 1892 Feb 8
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.
+# Rearguard section, for parsers lacking negative DST; see ziguard.awk.
# 2:00 - CAT 1994 Mar 21 0:00
# From Paul Eggert (2017-04-07):
# The official date of the 2017 rule change was 2017-10-24. See:
diff --git a/contrib/tzdata/asia b/contrib/tzdata/asia
index b29c896e5fde..106efad877bc 100644
--- a/contrib/tzdata/asia
+++ b/contrib/tzdata/asia
@@ -286,6 +286,27 @@ Zone Asia/Yangon 6:24:47 - LMT 1880 # or Rangoon
# China
+# From Phake Nick (2020-04-15):
+# According to this news report:
+# http://news.sina.com.cn/c/2004-09-01/19524201403.shtml
+# on April 11, 1919, newspaper in Shanghai said clocks in Shanghai will spring
+# forward for an hour starting from midnight of that Saturday. The report did
+# not mention what happened in Shanghai thereafter, but it mentioned that a
+# similar trial in Tianjin which ended at October 1st as citizens are told to
+# recede the clock on September 30 from 12:00pm to 11:00pm. The trial at
+# Tianjin got terminated in 1920.
+#
+# From Paul Eggert (2020-04-15):
+# The Returns of Trade and Trade Reports, page 711, says "Daylight saving was
+# given a trial during the year, and from the 12th April to the 1st October
+# the clocks were all set one hour ahead of sun time. Though the scheme was
+# generally esteemed a success, it was announced early in 1920 that it would
+# not be repeated."
+#
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
+Rule Shang 1919 only - Apr 12 24:00 1:00 D
+Rule Shang 1919 only - Sep 30 24:00 0 S
+
# From Paul Eggert (2018-10-02):
# The following comes from Table 1 of:
# Li Yu. Research on the daylight saving movement in 1940s Shanghai.
@@ -294,6 +315,89 @@ Zone Asia/Yangon 6:24:47 - LMT 1880 # or Rangoon
# The table lists dates only; I am guessing 00:00 and 24:00 transition times.
# Also, the table lists the planned end of DST in 1949, but the corresponding
# zone line cuts this off on May 28, when the Communists took power.
+
+# From Phake Nick (2020-04-15):
+#
+# For the history of time in Shanghai between 1940-1942, the situation is
+# actually slightly more complex than the table [below].... At the time,
+# there were three different authorities in Shanghai, including Shanghai
+# International Settlement, a settlement established by western countries with
+# its own westernized form of government, Shanghai French Concession, similar
+# to the international settlement but is controlled by French, and then the
+# rest of the city of Shanghai, which have already been controlled by Japanese
+# force through a puppet local government (Wang Jingwei regime). It was
+# additionally complicated by the circumstances that, according to the 1940s
+# Shanghai summer time essay cited in the database, some
+# departments/businesses/people in the Shanghai city itself during that time
+# period, refused to change their clock and instead only changed their opening
+# hours.
+#
+# For example, as quoted in the article, in 1940, other than the authority
+# itself, power, tram, bus companies, cinema, department stores, and other
+# public service organizations have all decided to follow the summer time and
+# spring forward the clock. On the other hand, the custom office refused to
+# spring forward the clock because of worry on mechanical wear to the physical
+# clock, postal office refused to spring forward because of disruption to
+# business and log-keeping, although they did changed their office hour to
+# match rest of the city. So is travel agents, and also weather
+# observatory. It is said both time standards had their own supporters in the
+# city at the time, those who prefer new time standard would have moved their
+# clock while those who prefer the old time standard would keep their clock
+# unchange, and there were different clocks that use different time standard
+# in the city at the time for people who use different time standard to adjust
+# their clock to their preferred time.
+#
+# a. For the 1940 May 31 spring forward, the essay claim that it was
+# coordinared between the international settlement authority and the French
+# concession authority and have gathered support from Hong Kong and Xiamen,
+# that it would spring forward an hour from May 31 "midnight", and the essay
+# claim "Hong Kong government implemented the spring forward in the same time
+# on the same date as Shanghai".
+#
+# b. For the 1940 fall back, it was said that they initially intended to do
+# so on September 30 00:59 at night, however they postponed it to October 12
+# after discussion with relevant parties. However schools restored to the
+# original schedule ten days earlier.
+#
+# c. For the 1941 spring forward, it is said to start from March 15
+# "following the previous year's method", and in addition to that the essay
+# cited an announcement in 1941 from the Wang regime which said the Special
+# City of Shanghai under Wang regime control will follow the DST rule set by
+# the Settlements, irrespective of the original DST plan announced by the Wang
+# regime for other area under its control(April 1 to September 30). (no idea
+# to situation before that announcement)
+#
+# d. For the 1941 fall back, it was said that the fall back would occurs at
+# the end of September (A newspaper headline cited by the essay, published on
+# October 1, 1941, have the headlines which said "French Concession would
+# rewind to the old clock this morning), but it ultimately didn't happen due
+# to disagreement between the international settlement authority and the
+# French concession authority, and the fall back ultimately occurred on
+# November 1.
+#
+# e. In 1941 December, Japan have officially started war with the United
+# States and the United Kingdom, and in Shanghai they have marched into the
+# international settlement, taken over its control
+#
+# f. For the 1942 spring forward, the essay said that the spring forward
+# started on January 31. It said this time the custom office and postal
+# department will also change their clocks, unlike before.
+#
+# g. The essay itself didn't cover any specific changes thereafter until the
+# end of the war, it quoted a November 1942 command from the government of the
+# Wang regime, which claim the daylight saving time applies year round during
+# the war. However, the essay ambiguously said the period is "February 1 to
+# September 30", which I don't really understand what is the meaning of such
+# period in the context of year round implementation here.. More researches
+# might be needed to show exactly what happened during that period of time.
+
+# From Phake Nick (2020-04-15):
+# According to a Japanese tour bus pamphlet in Nanjing area believed to be
+# from around year 1941: http://www.tt-museum.jp/tairiku_0280_nan1941.html ,
+# the schedule listed was in the format of Japanese time. Which indicate some
+# use of the Japanese time (instead of syncing by DST) might have occurred in
+# the Yangtze river delta area during that period of time although the scope
+# of such use will need to be investigated to determine.
#
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Shang 1940 only - Jun 1 0:00 1:00 D
@@ -572,7 +676,7 @@ Zone Asia/Urumqi 5:50:20 - LMT 1928
6:00 - +06
-# Hong Kong (Xianggang)
+# Hong Kong
# Milne gives 7:36:41.7; round this.
@@ -582,9 +686,7 @@ Zone Asia/Urumqi 5:50:20 - LMT 1928
# it is not [an] observatory, but the official meteorological agency of HK,
# and also serves as the official timing agency), there are some missing
# and incorrect rules. Although the exact switch over time is missing, I
-# think 3:30 is correct. The official DST record for Hong Kong can be
-# obtained from
-# http://www.hko.gov.hk/gts/time/Summertime.htm
+# think 3:30 is correct.
# From Phake Nick (2018-10-27):
# According to Singaporean newspaper
@@ -695,10 +797,10 @@ Zone Asia/Urumqi 5:50:20 - LMT 1928
# Resolution of the Legislative Council passed on 9 May 1979
# https://www.legco.gov.hk/yr78-79/english/lc_sitg/hansard/h790509.pdf#page=39
-# From Paul Eggert (2019-05-31):
+# From Paul Eggert (2020-04-15):
# Here are the dates given at
-# https://www.hko.gov.hk/gts/time/Summertime.htm
-# as of 2014-06-19:
+# https://www.hko.gov.hk/en/gts/time/Summertime.htm
+# as of 2020-02-10:
# Year Period
# 1941 15 Jun to 30 Sep
# 1942 Whole year
@@ -1828,6 +1930,47 @@ Zone Asia/Jerusalem 2:20:54 - LMT 1880
# '9:00' and 'JST' is from Guy Harris.
+# From Paul Eggert (2020-01-19):
+# Starting in the 7th century, Japan generally followed an ancient Chinese
+# timekeeping system that divided night and day into six hours each,
+# with hour length depending on season. In 1873 the government
+# started requiring the use of a Western style 24-hour clock. See:
+# Yulia Frumer, "Making Time: Astronomical Time Measurement in Tokugawa Japan"
+# <https://www.worldcat.org/oclc/1043907065>. As the tzdb code and
+# data support only 24-hour clocks, its tables model timestamps before
+# 1873 using Western-style local mean time.
+
+# From Hideyuki Suzuki (1998-11-09):
+# 'Tokyo' usually stands for the former location of Tokyo Astronomical
+# Observatory: 139° 44' 40.90" E (9h 18m 58.727s), 35° 39' 16.0" N.
+# This data is from 'Rika Nenpyou (Chronological Scientific Tables) 1996'
+# edited by National Astronomical Observatory of Japan....
+# JST (Japan Standard Time) has been used since 1888-01-01 00:00 (JST).
+# The law is enacted on 1886-07-07.
+
+# From Hideyuki Suzuki (1998-11-16):
+# The ordinance No. 51 (1886) established "standard time" in Japan,
+# which stands for the time on 135° E.
+# In the ordinance No. 167 (1895), "standard time" was renamed to "central
+# standard time". And the same ordinance also established "western standard
+# time", which stands for the time on 120° E.... But "western standard
+# time" was abolished in the ordinance No. 529 (1937). In the ordinance No.
+# 167, there is no mention regarding for what place western standard time is
+# standard....
+#
+# I wrote "ordinance" above, but I don't know how to translate.
+# In Japanese it's "chokurei", which means ordinance from emperor.
+
+# From Yu-Cheng Chuang (2013-07-12):
+# ...the Meiji Emperor announced Ordinance No. 167 of Meiji Year 28 "The clause
+# about standard time" ... The adoption began from Jan 1, 1896.
+# https://ja.wikisource.org/wiki/標準時ニ關スル件_(公布時)
+#
+# ...the Showa Emperor announced Ordinance No. 529 of Showa Year 12 ... which
+# means the whole Japan territory, including later occupations, adopt Japan
+# Central Time (UT+9). The adoption began on Oct 1, 1937.
+# https://ja.wikisource.org/wiki/明治二十八年勅令第百六十七號標準時ニ關スル件中改正ノ件
+
# From Paul Eggert (1995-03-06):
# Today's _Asahi Evening News_ (page 4) reports that Japan had
# daylight saving between 1948 and 1951, but "the system was discontinued
@@ -1876,37 +2019,6 @@ Rule Japan 1948 1951 - Sep Sat>=8 25:00 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
-# Observatory: 139° 44' 40.90" E (9h 18m 58.727s), 35° 39' 16.0" N.
-# This data is from 'Rika Nenpyou (Chronological Scientific Tables) 1996'
-# edited by National Astronomical Observatory of Japan....
-# JST (Japan Standard Time) has been used since 1888-01-01 00:00 (JST).
-# The law is enacted on 1886-07-07.
-
-# From Hideyuki Suzuki (1998-11-16):
-# The ordinance No. 51 (1886) established "standard time" in Japan,
-# which stands for the time on 135° E.
-# In the ordinance No. 167 (1895), "standard time" was renamed to "central
-# standard time". And the same ordinance also established "western standard
-# time", which stands for the time on 120° E.... But "western standard
-# time" was abolished in the ordinance No. 529 (1937). In the ordinance No.
-# 167, there is no mention regarding for what place western standard time is
-# standard....
-#
-# I wrote "ordinance" above, but I don't know how to translate.
-# In Japanese it's "chokurei", which means ordinance from emperor.
-
-# From Yu-Cheng Chuang (2013-07-12):
-# ...the Meiji Emperor announced Ordinance No. 167 of Meiji Year 28 "The clause
-# about standard time" ... The adoption began from Jan 1, 1896.
-# https://ja.wikisource.org/wiki/標準時ニ關スル件_(公布時)
-#
-# ...the Showa Emperor announced Ordinance No. 529 of Showa Year 12 ... which
-# means the whole Japan territory, including later occupations, adopt Japan
-# Central Time (UT+9). The adoption began on Oct 1, 1937.
-# https://ja.wikisource.org/wiki/明治二十八年勅令第百六十七號標準時ニ關スル件中改正ノ件
-
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Tokyo 9:18:59 - LMT 1887 Dec 31 15:00u
9:00 Japan J%sT
@@ -3086,22 +3198,9 @@ Zone Asia/Karachi 4:28:12 - LMT 1907
# [T]he Palestinian cabinet decision (Mar 8th 2016) published on
# http://www.palestinecabinet.gov.ps/WebSite/Upload/Decree/GOV_17/16032016134830.pdf
# states that summer time will end on Oct 29th at 01:00.
-#
-# From Tim Parenti (2016-10-19):
-# Predict fall transitions on October's last Saturday at 01:00 from now on.
-# This is consistent with the 2016 transition as well as our spring
-# predictions.
-#
-# From Paul Eggert (2016-10-19):
-# It's also consistent with predictions in the following URLs today:
-# https://www.timeanddate.com/time/change/gaza-strip/gaza
-# https://www.timeanddate.com/time/change/west-bank/hebron
# 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 official website, though the decree did not specify the exact
-# time of the time shift.
+# Palestine summer time will start on Mar 24th 2018 ...
# http://www.palestinecabinet.gov.ps/Website/AR/NDecrees/ViewFile.ashx?ID=e7a42ab7-ee23-435a-b9c8-a4f7e81f3817
# From Even Scharning (2019-03-23):
@@ -3111,15 +3210,20 @@ Zone Asia/Karachi 4:28:12 - LMT 1907
# From Sharif Mustafa (2019-03-26):
# The Palestinian cabinet announced today that the switch to DST will
# be on Fri Mar 29th 2019 by advancing the clock by 60 minutes.
-# The decree signing date is Mar 12th but it was not published till today.
-# The decree does not specify the exact time of switch.
# http://palestinecabinet.gov.ps/Website/AR/NDecrees/ViewFile.ashx?ID=e54e9ea1-50ee-4137-84df-0d6c78da259b
#
# From Even Scharning (2019-04-10):
# Our source in Palestine said it happened Friday 29 at 00:00 local time....
+
+# From Sharef Mustafa (2019-10-18):
+# Palestine summer time will end on midnight Oct 26th 2019 ...
+# http://www.palestinecabinet.gov.ps/website/ar/ViewDetails?ID=43948
#
# From Paul Eggert (2019-04-10):
# For now, guess spring-ahead transitions are March's last Friday at 00:00.
+#
+# From Tim Parenti (2016-10-19):
+# Predict fall transitions on October's last Saturday at 01:00 from now on.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule EgyptAsia 1957 only - May 10 0:00 1:00 S
diff --git a/contrib/tzdata/backward b/contrib/tzdata/backward
index b4ae3cf9d3e2..e13ae527a9e8 100644
--- a/contrib/tzdata/backward
+++ b/contrib/tzdata/backward
@@ -17,6 +17,7 @@ Link America/Atikokan America/Coral_Harbour
Link America/Argentina/Cordoba America/Cordoba
Link America/Tijuana America/Ensenada
Link America/Indiana/Indianapolis America/Fort_Wayne
+Link America/Nuuk America/Godthab
Link America/Indiana/Indianapolis America/Indianapolis
Link America/Argentina/Jujuy America/Jujuy
Link America/Indiana/Knox America/Knox_IN
diff --git a/contrib/tzdata/backzone b/contrib/tzdata/backzone
index 3ccadd139240..91fa21da8e39 100644
--- a/contrib/tzdata/backzone
+++ b/contrib/tzdata/backzone
@@ -33,6 +33,35 @@
# assumes rules from other files. In the tz distribution, use
# 'make PACKRATDATA=backzone zones' to compile and install this file.
+
+# From Paul Eggert (2020-04-15):
+# The following remarks should be incorporated into this table sometime.
+# Patches in 'git format-patch' format would be welcome.
+#
+# From Phake Nick (2020-04-15):
+# ... the historical timezone data for those China zones seems to be
+# incorrect. The transition to GMT+8 date given there for these zones
+# were 1980 which also contradict the file description that they do
+# not disagree with normal zone after 1970. According to sources that
+# have also been cited in the asia file, except Xinjiang and Tibet,
+# they should have adopted the Beijing Time from around 1949/1950
+# depends on exactly when each of those cities were taken over by the
+# communist army. And they should also follow the DST setting of
+# Asia/Shanghai after that point of time. In addition,
+# http://gaz.ncl.edu.tw/detail.jsp?sysid=E1091792 the document from
+# Chongqing Nationalist government say in year 1945 all of China
+# should adopt summer time due to the war (not sure whether it
+# continued after WWII ends)(Probably only enforced in area under
+# their rule at the time?) The Asia/Harbin's 1932 and 1940 entry
+# should also be incorrect. As per sources recorded at
+# https://wiki.suikawiki.org/n/%E6%BA%80%E5%B7%9E%E5%9B%BD%E3%81%AE%E6%A8%99%E6%BA%96%E6%99%82
+# , in 1932 Harbin should have adopted UTC+8:00 instead of data
+# currently listed in the tz database according to official
+# announcement from Manchuko. And they should have adopted GMT+9 in
+# 1937 January 1st according to official announcement at the time
+# being cited on the webpage.
+
+
# Zones are sorted by zone name. Each zone is preceded by the
# name of the country that the zone is in, along with any other
# commentary and rules associated with the entry.
diff --git a/contrib/tzdata/europe b/contrib/tzdata/europe
index 361b396c026d..5593c6079db1 100644
--- a/contrib/tzdata/europe
+++ b/contrib/tzdata/europe
@@ -549,12 +549,13 @@ 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
-# The next line is for when negative SAVE values are used.
+# Vanguard section, for zic and other parsers that support negative DST.
1:00 Eire IST/GMT
-# These three lines are for when SAVE values are always nonnegative.
+# Rearguard section, for parsers lacking negative DST; see ziguard.awk.
# 1:00 - IST 1971 Oct 31 2:00u
# 0:00 GB-Eire GMT/IST 1996
# 0:00 EU GMT/IST
+# End of rearguard section.
###############################################################################
@@ -1018,7 +1019,7 @@ Zone Europe/Prague 0:57:44 - LMT 1850
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.
+# Rearguard section, for parsers lacking negative DST; see ziguard.awk.
# 0:00 - GMT 1947 Feb 23 2:00
# End of rearguard section.
1:00 Czech CE%sT 1979
@@ -1175,14 +1176,17 @@ Zone America/Danmarkshavn -1:14:40 - LMT 1916 Jul 28
-3:00 - -03 1980 Apr 6 2:00
-3:00 EU -03/-02 1996
0:00 - GMT
+#
+# Use the old name Scoresbysund, as the current name Ittoqqortoormiit
+# exceeds tzdb's 14-letter limit and has no common English abbreviation.
Zone America/Scoresbysund -1:27:52 - LMT 1916 Jul 28 # Ittoqqortoormiit
-2:00 - -02 1980 Apr 6 2:00
-2:00 C-Eur -02/-01 1981 Mar 29
-1:00 EU -01/+00
-Zone America/Godthab -3:26:56 - LMT 1916 Jul 28 # Nuuk
+Zone America/Nuuk -3:26:56 - LMT 1916 Jul 28 # Godthåb
-3:00 - -03 1980 Apr 6 2:00
-3:00 EU -03/-02
-Zone America/Thule -4:35:08 - LMT 1916 Jul 28 # Pituffik air base
+Zone America/Thule -4:35:08 - LMT 1916 Jul 28 # Pituffik
-4:00 Thule A%sT
# Estonia
@@ -1552,7 +1556,7 @@ Zone Europe/Budapest 1:16:20 - LMT 1890 Oct
#
# From January 1st, 1908 the whole of Iceland was standardised at 1 hour
# behind GMT. Previously, local mean solar time was used in different parts
-# of Iceland, the almanak had been based on Reykjavik mean solar time which
+# of Iceland, the almanak had been based on Reykjavík mean solar time which
# was 1 hour and 28 minutes behind GMT.
#
# "first day of winter" referred to [below] means the first day of the 26 weeks
diff --git a/contrib/tzdata/leap-seconds.list b/contrib/tzdata/leap-seconds.list
index a1bc5a782a83..ac153daebf86 100644
--- a/contrib/tzdata/leap-seconds.list
+++ b/contrib/tzdata/leap-seconds.list
@@ -62,7 +62,7 @@
# Terry Quinn, "The BIPM and the Accurate Measurement
# of Time," Proc. of the IEEE, Vol. 79, pp. 894-905,
# July, 1991. <http://dx.doi.org/10.1109/5.84965>
-# reprinted in:
+# reprinted in:
# Christine Hackman and Donald B Sullivan (eds.)
# Time and Frequency Measurement
# American Association of Physics Teachers (1996)
@@ -204,10 +204,10 @@
# current -- the update time stamp, the data and the name of the file
# will not change.
#
-# Updated through IERS Bulletin C58
-# File expires on: 28 June 2020
+# Updated through IERS Bulletin C59
+# File expires on: 28 December 2020
#
-#@ 3802291200
+#@ 3818102400
#
2272060800 10 # 1 Jan 1972
2287785600 11 # 1 Jul 1972
@@ -252,4 +252,4 @@
# the hash line is also ignored in the
# computation.
#
-#h f28827d2 f263b6c3 ec0f19eb a3e0dbf0 97f3fa30
+#h a1c168ae 27c79a7d 9dddcfc3 bcfe616b 2e2c44ea
diff --git a/contrib/tzdata/leapseconds b/contrib/tzdata/leapseconds
index 7808df8f894f..3b9cc7b20317 100644
--- a/contrib/tzdata/leapseconds
+++ b/contrib/tzdata/leapseconds
@@ -64,9 +64,15 @@ Leap 2012 Jun 30 23:59:60 + S
Leap 2015 Jun 30 23:59:60 + S
Leap 2016 Dec 31 23:59:60 + S
+# UTC timestamp when this leap second list expires.
+# Any additional leap seconds will come after this.
+# This Expires line is commented out for now,
+# so that pre-2020a zic implementations do not reject this file.
+#Expires 2020 Dec 28 00:00:00
+
# POSIX timestamps for the data in this file:
#updated 1467936000 (2016-07-08 00:00:00 UTC)
-#expires 1593302400 (2020-06-28 00:00:00 UTC)
+#expires 1609113600 (2020-12-28 00:00:00 UTC)
-# Updated through IERS Bulletin C58
-# File expires on: 28 June 2020
+# Updated through IERS Bulletin C59
+# File expires on: 28 December 2020
diff --git a/contrib/tzdata/leapseconds.awk b/contrib/tzdata/leapseconds.awk
index 1fe50120afda..924ade9e2193 100644
--- a/contrib/tzdata/leapseconds.awk
+++ b/contrib/tzdata/leapseconds.awk
@@ -68,12 +68,12 @@ BEGIN {
monthabbr[11] = "Nov"
monthabbr[12] = "Dec"
- # Strip trailing CR, in case the input has CRLF form a la NIST.
- RS = "\r?\n"
-
sstamp_init()
}
+# In case the input has CRLF form a la NIST.
+{ sub(/\r$/, "") }
+
/^#[ \t]*[Uu]pdated through/ || /^#[ \t]*[Ff]ile expires on/ {
last_lines = last_lines $0 "\n"
}
@@ -100,6 +100,17 @@ BEGIN {
}
END {
+ sstamp_to_ymdhMs(expires, ss_NTP)
+
+ print ""
+ print "# UTC timestamp when this leap second list expires."
+ print "# Any additional leap seconds will come after this."
+ print "# This Expires line is commented out for now,"
+ print "# so that pre-2020a zic implementations do not reject this file."
+ printf "%sExpires %.4d\t%s\t%.2d\t%.2d:%.2d:%.2d\n", \
+ EXPIRES_LINE ? "" : "#", \
+ ss_year, monthabbr[ss_month], ss_mday, ss_hour, ss_min, ss_sec
+
# The difference between the NTP and POSIX epochs is 70 years
# (including 17 leap days), each 24 hours of 60 minutes of 60
# seconds each.
diff --git a/contrib/tzdata/northamerica b/contrib/tzdata/northamerica
index 8771d96e64e8..febf05bfddb6 100644
--- a/contrib/tzdata/northamerica
+++ b/contrib/tzdata/northamerica
@@ -86,7 +86,7 @@
# For more about the first ten years of DST in the United States, see
# Robert Garland, Ten years of daylight saving from the Pittsburgh standpoint
# (Carnegie Library of Pittsburgh, 1927).
-# http://www.clpgh.org/exhibit/dst.html
+# https://web.archive.org/web/20160517155308/http://www.clpgh.org/exhibit/dst.html
#
# Shanks says that DST was called "War Time" in the US in 1918 and 1919.
# However, DST was imposed by the Standard Time Act of 1918, which
@@ -1470,7 +1470,8 @@ Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
-4:00 Canada A%sT
-# west Labrador, Nova Scotia, Prince Edward I
+# west Labrador, Nova Scotia, Prince Edward I,
+# Îles-de-la-Madeleine, Listuguj reserve
# From Brian Inglis (2015-07-20):
# From the historical weather station records available at:
@@ -1489,6 +1490,13 @@ Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
# in Canada to observe DST in 1971 but not 1970; for now we'll assume
# this is a typo.
+# From Jeffery Nichols (2020-01-09):
+# America/Halifax ... also applies to Îles-de-la-Madeleine and the Listuguj
+# reserve in Quebec. Officially, this came into effect on January 1, 2007
+# (Legal Time Act, CQLR c T-5.1), but the legislative debates surrounding that
+# bill say that it is "accommodating the customs and practices" of those
+# regions, which suggests that they have always been in-line with Halifax.
+
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Halifax 1916 only - Apr 1 0:00 1:00 D
Rule Halifax 1916 only - Oct 1 0:00 0 S
@@ -1582,19 +1590,20 @@ Zone America/Moncton -4:19:08 - LMT 1883 Dec 9
# Quebec
-# From Paul Eggert (2015-03-24):
+# From Paul Eggert (2020-01-10):
# See America/Toronto for most of Quebec, including Montreal.
+# See America/Halifax for the Îles de la Madeleine and the Listuguj reserve.
#
# Matthews and Vincent (1998) also write that Quebec east of the -63
# meridian is supposed to observe AST, but residents as far east as
# Natashquan use EST/EDT, and residents east of Natashquan use AST.
# The Quebec department of justice writes in
# "The situation in Minganie and Basse-Côte-Nord"
-# http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm
+# https://www.justice.gouv.qc.ca/en/department/ministre/functions-and-responsabilities/legal-time-in-quebec/the-situation-in-minganie-and-basse-cote-nord/
# that the coastal strip from just east of Natashquan to Blanc-Sablon
# observes Atlantic standard time all year round.
-# https://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en
-# says this common practice was codified into law as of 2007.
+# This common practice was codified into law as of 2007; see Legal Time Act,
+# CQLR c T-5.1 <http://legisquebec.gouv.qc.ca/en/ShowDoc/cs/T-5.1>.
# For lack of better info, guess this practice began around 1970, contra to
# Shanks & Pottenger who have this region observing AST/ADT.
@@ -1613,6 +1622,15 @@ Zone America/Blanc-Sablon -3:48:28 - LMT 1884
# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
# Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
+# From Jeffery Nichols (2020-02-06):
+# According to the [Shanks] atlas, those western Ontario zones are huge,
+# covering most of Ontario northwest of Sault Ste Marie and Timmins.
+# The zones seem to include towns bigger than the ones they're named after,
+# like Dryden in America/Rainy_River and Wawa (and maybe Attawapiskat) in
+# America/Nipigon. I assume it's too much trouble to change the name of the
+# zone (like when you found out that America/Glace_Bay includes Sydney, Nova
+# Scotia)....
+
# From Mark Brader (2003-07-26):
# [According to the Toronto Star] Orillia, Ontario, adopted DST
# effective Saturday, 1912-06-22, 22:00; the article mentions that
@@ -2419,6 +2437,18 @@ Zone America/Creston -7:46:04 - LMT 1884
# obtained in November 2008 should be ignored...
# I apologize for reporting incorrect information in 2008.
+# From Tim Parenti (2020-03-05):
+# The government of Yukon announced [yesterday] the cessation of seasonal time
+# changes. "After clocks are pushed ahead one hour on March 8, the territory
+# will remain on [UTC-07]. ... [The government] found 93 per cent of
+# respondents wanted to end seasonal time changes and, of that group, 70 per
+# cent wanted 'permanent Pacific Daylight Saving Time.'"
+# https://www.cbc.ca/news/canada/north/yukon-end-daylight-saving-time-1.5486358
+#
+# Although the government press release prefers PDT, we prefer MST for
+# consistency with nearby Dawson Creek, Creston, and Fort Nelson.
+# https://yukon.ca/en/news/yukon-end-seasonal-time-change
+
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
Rule NT_YK 1918 only - Oct 27 2:00 0 S
@@ -2473,11 +2503,13 @@ Zone America/Inuvik 0 - -00 1953 # Inuvik founded
Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
-9:00 NT_YK Y%sT 1967 May 28 0:00
-8:00 NT_YK P%sT 1980
- -8:00 Canada P%sT
+ -8:00 Canada P%sT 2020 Mar 8 2:00
+ -7:00 - MST
Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
-9:00 NT_YK Y%sT 1973 Oct 28 0:00
-8:00 NT_YK P%sT 1980
- -8:00 Canada P%sT
+ -8:00 Canada P%sT 2020 Mar 8 2:00
+ -7:00 - MST
###############################################################################
diff --git a/contrib/tzdata/theory.html b/contrib/tzdata/theory.html
index 7af7cb23c657..c0e6f021269a 100644
--- a/contrib/tzdata/theory.html
+++ b/contrib/tzdata/theory.html
@@ -298,6 +298,10 @@ in decreasing order of importance:
If a name is changed, put its old spelling in the
'<code>backward</code>' file.
This means old spellings will continue to work.
+ Ordinarily a name change should occur only in the rare case when
+ a location's consensus English-language spelling changes; for example,
+ in 2008 <code>Asia/Calcutta</code> was renamed to <code>Asia/Kolkata</code>
+ due to long-time widespread use of the new city name instead of the old.
</li>
</ul>
@@ -1054,23 +1058,6 @@ an older <code>zic</code>.
The functions were inspired by <a href="https://netbsd.org/">NetBSD</a>.
</li>
<li>
- A function <code>tzsetwall</code> has been added to arrange for the
- system's best approximation to local (wall clock) time to be delivered
- by subsequent calls to <code>localtime</code>.
- Source code for portable applications that "must" run on local
- time should call <code>tzsetwall</code>;
- if such code is moved to "old" systems that do not
- provide <code>tzsetwall</code>, you will not be able to generate an
- executable program.
- (These functions also arrange for local time to
- be used if <code>tzset</code> is called &ndash; directly or
- indirectly &ndash; and there is no <code>TZ</code> environment
- variable; portable applications should not, however, rely on this
- behavior since it is not the way <a
- href="https://en.wikipedia.org/wiki/UNIX_System_V#SVR2"><abbr>SVR2</abbr></a>
- systems behave.)
- </li>
- <li>
Negative <code>time_t</code> values are supported, on systems
where <code>time_t</code> is signed.
</li>
@@ -1137,7 +1124,7 @@ The vestigial <abbr>API</abbr>s are:
may now examine <code>localtime(&amp;clock)-&gt;tm_zone</code>
(if <code>TM_ZONE</code> is defined) or
<code>tzname[localtime(&amp;clock)-&gt;tm_isdst]</code>
- (if <code>HAVE_TZNAME</code> is defined) to learn the correct time
+ (if <code>HAVE_TZNAME</code> is nonzero) to learn the correct time
zone abbreviation to use.
</li>
<li>
diff --git a/contrib/tzdata/version b/contrib/tzdata/version
index db18f8311daf..7f680eec360e 100644
--- a/contrib/tzdata/version
+++ b/contrib/tzdata/version
@@ -1 +1 @@
-2019c
+2020a
diff --git a/contrib/tzdata/zone.tab b/contrib/tzdata/zone.tab
index 408fcb2051d7..8d056e374835 100644
--- a/contrib/tzdata/zone.tab
+++ b/contrib/tzdata/zone.tab
@@ -131,8 +131,8 @@ CA +4906-11631 America/Creston MST - BC (Creston)
CA +5946-12014 America/Dawson_Creek MST - BC (Dawson Cr, Ft St John)
CA +5848-12242 America/Fort_Nelson MST - BC (Ft Nelson)
CA +4916-12307 America/Vancouver Pacific - BC (most areas)
-CA +6043-13503 America/Whitehorse Pacific - Yukon (south)
-CA +6404-13925 America/Dawson Pacific - Yukon (north)
+CA +6043-13503 America/Whitehorse Pacific - Yukon (east)
+CA +6404-13925 America/Dawson Pacific - Yukon (west)
CC -1210+09655 Indian/Cocos
CD -0418+01518 Africa/Kinshasa Dem. Rep. of Congo (west)
CD -1140+02728 Africa/Lubumbashi Dem. Rep. of Congo (east)
@@ -189,7 +189,7 @@ GF +0456-05220 America/Cayenne
GG +492717-0023210 Europe/Guernsey
GH +0533-00013 Africa/Accra
GI +3608-00521 Europe/Gibraltar
-GL +6411-05144 America/Godthab Greenland (most areas)
+GL +6411-05144 America/Nuuk Greenland (most areas)
GL +7646-01840 America/Danmarkshavn National Park (east coast)
GL +7029-02158 America/Scoresbysund Scoresbysund/Ittoqqortoormiit
GL +7634-06847 America/Thule Thule/Pituffik
@@ -335,7 +335,7 @@ RU +554521+0373704 Europe/Moscow MSK+00 - Moscow area
# The obsolescent zone.tab format cannot represent Europe/Simferopol well.
# Put it in RU section and list as UA. See "territorial claims" above.
# Programs should use zone1970.tab instead; see above.
-UA +4457+03406 Europe/Simferopol MSK+00 - Crimea
+UA +4457+03406 Europe/Simferopol Crimea
RU +5836+04939 Europe/Kirov MSK+00 - Kirov
RU +4621+04803 Europe/Astrakhan MSK+01 - Astrakhan
RU +4844+04425 Europe/Volgograd MSK+01 - Volgograd
@@ -399,8 +399,8 @@ TV -0831+17913 Pacific/Funafuti
TW +2503+12130 Asia/Taipei
TZ -0648+03917 Africa/Dar_es_Salaam
UA +5026+03031 Europe/Kiev Ukraine (most areas)
-UA +4837+02218 Europe/Uzhgorod Ruthenia
-UA +4750+03510 Europe/Zaporozhye Zaporozh'ye/Zaporizhia; Lugansk/Luhansk (east)
+UA +4837+02218 Europe/Uzhgorod Transcarpathia
+UA +4750+03510 Europe/Zaporozhye Zaporozhye and east Lugansk
UG +0019+03225 Africa/Kampala
UM +2813-17722 Pacific/Midway Midway Islands
UM +1917+16637 Pacific/Wake Wake Island
diff --git a/contrib/tzdata/zone1970.tab b/contrib/tzdata/zone1970.tab
index 95b6102b6da4..f60c3c1eeac5 100644
--- a/contrib/tzdata/zone1970.tab
+++ b/contrib/tzdata/zone1970.tab
@@ -129,8 +129,8 @@ CA +4906-11631 America/Creston MST - BC (Creston)
CA +5946-12014 America/Dawson_Creek MST - BC (Dawson Cr, Ft St John)
CA +5848-12242 America/Fort_Nelson MST - BC (Ft Nelson)
CA +4916-12307 America/Vancouver Pacific - BC (most areas)
-CA +6043-13503 America/Whitehorse Pacific - Yukon (south)
-CA +6404-13925 America/Dawson Pacific - Yukon (north)
+CA +6043-13503 America/Whitehorse Pacific - Yukon (east)
+CA +6404-13925 America/Dawson Pacific - Yukon (west)
CC -1210+09655 Indian/Cocos
CH,DE,LI +4723+00832 Europe/Zurich Swiss time
CI,BF,GM,GN,ML,MR,SH,SL,SN,TG +0519-00402 Africa/Abidjan
@@ -174,7 +174,7 @@ GE +4143+04449 Asia/Tbilisi
GF +0456-05220 America/Cayenne
GH +0533-00013 Africa/Accra
GI +3608-00521 Europe/Gibraltar
-GL +6411-05144 America/Godthab Greenland (most areas)
+GL +6411-05144 America/Nuuk Greenland (most areas)
GL +7646-01840 America/Danmarkshavn National Park (east coast)
GL +7029-02158 America/Scoresbysund Scoresbysund/Ittoqqortoormiit
GL +7634-06847 America/Thule Thule/Pituffik
@@ -291,7 +291,7 @@ RS,BA,HR,ME,MK,SI +4450+02030 Europe/Belgrade
RU +5443+02030 Europe/Kaliningrad MSK-01 - Kaliningrad
RU +554521+0373704 Europe/Moscow MSK+00 - Moscow area
# Mention RU and UA alphabetically. See "territorial claims" above.
-RU,UA +4457+03406 Europe/Simferopol MSK+00 - Crimea
+RU,UA +4457+03406 Europe/Simferopol Crimea
RU +5836+04939 Europe/Kirov MSK+00 - Kirov
RU +4621+04803 Europe/Astrakhan MSK+01 - Astrakhan
RU +4844+04425 Europe/Volgograd MSK+01 - Volgograd
@@ -342,8 +342,8 @@ TT,AG,AI,BL,DM,GD,GP,KN,LC,MF,MS,VC,VG,VI +1039-06131 America/Port_of_Spain
TV -0831+17913 Pacific/Funafuti
TW +2503+12130 Asia/Taipei
UA +5026+03031 Europe/Kiev Ukraine (most areas)
-UA +4837+02218 Europe/Uzhgorod Ruthenia
-UA +4750+03510 Europe/Zaporozhye Zaporozh'ye/Zaporizhia; Lugansk/Luhansk (east)
+UA +4837+02218 Europe/Uzhgorod Transcarpathia
+UA +4750+03510 Europe/Zaporozhye Zaporozhye and east Lugansk
UM +1917+16637 Pacific/Wake Wake Island
US +404251-0740023 America/New_York Eastern (most areas)
US +421953-0830245 America/Detroit Eastern - MI (most areas)