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author	Philip Paeps <philip@FreeBSD.org>	2020-04-24 04:53:23 +0000
committer	Philip Paeps <philip@FreeBSD.org>	2020-04-24 04:53:23 +0000
commit	545922d605327cfdaff9461177686766dfe6a2fe (patch)
tree	63e2dd8ae8f20bc5af04da62b6382f7a349fb9e3
parent	2eb2d45aab9f36faed7e87a9588d1c4067e3eb42 (diff)
download	src-545922d605327cfdaff9461177686766dfe6a2fe.tar.gz src-545922d605327cfdaff9461177686766dfe6a2fe.zip

vendor/tzdata/tzdata2020a

Notes

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15 files changed, 421 insertions, 147 deletions

diff --git a/Makefile b/Makefile
index fec0a4f7eb36..610bf199d9a3 100644
--- a/Makefile
+++ b/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/NEWS b/NEWS
index af0f06f7192d..321e09084190 100644
--- a/NEWS
+++ b/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/africa b/africa
index feb6017d959b..724744f37723 100644
--- a/africa
+++ b/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/asia b/asia
index b29c896e5fde..106efad877bc 100644
--- a/asia
+++ b/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/backward b/backward
index b4ae3cf9d3e2..e13ae527a9e8 100644
--- a/backward
+++ b/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/backzone b/backzone
index 3ccadd139240..91fa21da8e39 100644
--- a/backzone
+++ b/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/europe b/europe
index 361b396c026d..5593c6079db1 100644
--- a/europe
+++ b/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/leap-seconds.list b/leap-seconds.list
index a1bc5a782a83..ac153daebf86 100644
--- a/leap-seconds.list
+++ b/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/leapseconds b/leapseconds
index 7808df8f894f..3b9cc7b20317 100644
--- a/leapseconds
+++ b/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/leapseconds.awk b/leapseconds.awk
index 1fe50120afda..924ade9e2193 100644
--- a/leapseconds.awk
+++ b/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/northamerica b/northamerica
index 8771d96e64e8..febf05bfddb6 100644
--- a/northamerica
+++ b/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/theory.html b/theory.html
index 7af7cb23c657..c0e6f021269a 100644
--- a/theory.html
+++ b/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 – directly or

- indirectly – 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(&clock)->tm_zone</code>

(if <code>TM_ZONE</code> is defined) or

<code>tzname[localtime(&clock)->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/version b/version
index db18f8311daf..7f680eec360e 100644
--- a/version
+++ b/version

@@ -1 +1 @@

-2019c

+2020a

diff --git a/zone.tab b/zone.tab
index 408fcb2051d7..8d056e374835 100644
--- a/zone.tab
+++ b/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/zone1970.tab b/zone1970.tab
index 822ffa1f1af0..53ee77e88e5e 100644
--- a/zone1970.tab
+++ b/zone1970.tab

@@ -128,8 +128,8 @@ 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

@@ -173,7 +173,7 @@ 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

@@ -290,7 +290,7 @@ 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

@@ -341,8 +341,8 @@ 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)