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Import tzdata 2018f

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This commit is contained in:
Philip Paeps 2018-10-19 09:58:30 +00:00
parent e5646a62c8
commit 2f05a751b7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/vendor/tzdata/dist/; revision=339444
svn path=/vendor/tzdata/tzdata2018f/; revision=339445; tag=vendor/tzdata/tzdata2018f
27 changed files with 1260 additions and 464 deletions
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13
CONTRIBUTING
View File

@ -17,11 +17,14 @@ To email small changes, please run a POSIX shell command like
'diff -u old/europe new/europe >myfix.patch', and attach
myfix.patch to the email.
For more-elaborate changes, please read the theory.html file and browse
the mailing list archives <https://mm.icann.org/pipermail/tz/> for
examples of patches that tend to work well. Additions to
data should contain commentary citing reliable sources as
justification. Citations should use https: URLs if available.
For more-elaborate or possibly-controversial changes,
such as renaming, adding or removing zones, please read
<https://www.iana.org/time-zones/repository/theory.html> or the file
theory.html. It is also good to browse the mailing list archives
<https://mm.icann.org/pipermail/tz/> for examples of patches that tend
to work well. Additions to data should contain commentary citing
reliable sources as justification. Citations should use https: URLs
if available.
Please submit changes against either the latest release in
<https://www.iana.org/time-zones> or the master branch of the development

328
Makefile
View File

@ -1,3 +1,5 @@
# Make and install tzdb code and data.
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.
@ -19,9 +21,9 @@ BUGEMAIL= tz@iana.org
# DATAFORM= rearguard
DATAFORM= main
# Change the line below for your time zone (after finding the zone you want in
# the time zone files, or adding it to a time zone file).
# Alternatively, if you discover you've got the wrong time zone, you can just
# Change the line below for your timezone (after finding the one you want in
# one of the $(TDATA) source files, or adding it to a source file).
# Alternatively, if you discover you've got the wrong timezone, you can just
# zic -l rightzone
# to correct things.
# Use the command
@ -31,14 +33,14 @@ DATAFORM= main
LOCALTIME= GMT
# If you want something other than Eastern United States time as a template
# for handling POSIX-style time zone environment variables,
# change the line below (after finding the zone you want in the
# time zone files, or adding it to a time zone file).
# for handling POSIX-style timezone environment variables,
# change the line below (after finding the timezone you want in the
# one of the $(TDATA) source files, or adding it to a source file).
# When a POSIX-style environment variable is handled, the rules in the
# template file are used to determine "spring forward" and "fall back" days and
# times; the environment variable itself specifies UT offsets of standard and
# daylight saving time.
# Alternatively, if you discover you've got the wrong time zone, you can just
# Alternatively, if you discover you've got the wrong timezone, you can just
# zic -p rightzone
# to correct things.
# Use the command
@ -75,7 +77,7 @@ DESTDIR =
# TOPDIR should be empty or an absolute name unless you're just testing.
TOPDIR =
# The default local time zone is taken from the file TZDEFAULT.
# The default local timezone is taken from the file TZDEFAULT.
TZDEFAULT = $(TOPDIR)/etc/localtime
# The subdirectory containing installed program and data files, and
@ -84,7 +86,7 @@ TZDEFAULT = $(TOPDIR)/etc/localtime
USRDIR = usr
USRSHAREDIR = $(USRDIR)/share
# "Compiled" time zone information is placed in the "TZDIR" directory
# "Compiled" timezone information is placed in the "TZDIR" directory
# (and subdirectories).
# TZDIR_BASENAME should not contain "/" and should not be ".", ".." or empty.
TZDIR_BASENAME= zoneinfo
@ -106,9 +108,13 @@ MANDIR = $(TOPDIR)/$(USRSHAREDIR)/man
LIBDIR = $(TOPDIR)/$(USRDIR)/lib
# Types to try, as an alternative to time_t. int64_t should be first.
TIME_T_ALTERNATIVES = int64_t int32_t uint32_t uint64_t
# Types to try, as an alternative to time_t.
TIME_T_ALTERNATIVES = $(TIME_T_ALTERNATIVES_HEAD) $(TIME_T_ALTERNATIVES_TAIL)
TIME_T_ALTERNATIVES_HEAD = int64_t
TIME_T_ALTERNATIVES_TAIL = int32_t uint32_t uint64_t
# What kind of TZif data files to generate.
# (TZif is the binary time zone data format that zic generates.)
# If you want only POSIX time, with time values interpreted as
# seconds since the epoch (not counting leap seconds), use
# REDO= posix_only
@ -129,7 +135,7 @@ TIME_T_ALTERNATIVES = int64_t int32_t uint32_t uint64_t
REDO= posix_right
# To install data in text form that has all the information of the binary data,
# 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
# To install text data without leap second information (e.g., because
@ -171,7 +177,6 @@ LDLIBS=
# Add the following to the end of the "CFLAGS=" line as needed to override
# defaults specified in the source code. "-DFOO" is equivalent to "-DFOO=1".
# -DBIG_BANG=-9999999LL if the Big Bang occurred at time -9999999 (see zic.c)
# -DDEPRECATE_TWO_DIGIT_YEARS for optional runtime warnings about strftime
# formats that generate only the last two digits of year numbers
# -DEPOCH_LOCAL if the 'time' function returns local time not UT
@ -295,7 +300,7 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \
# "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 time specified in the TZ environment variable)
# time (rather than the timezone specified in the TZ environment variable)
# to be used.
# "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.
@ -318,7 +323,7 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \
# "posix2time_z" and "time2posix_z" are added as well.
# The functions ending in "_z" (or "_rz") are like their unsuffixed
# (or suffixed-by-"_r") counterparts, except with an extra first
# argument of opaque type timezone_t that specifies the time zone.
# argument of opaque type timezone_t that specifies the timezone.
# "tzalloc" allocates a timezone_t value, and "tzfree" frees it.
#
# If you want to allocate state structures in localtime, add
@ -357,11 +362,14 @@ ZIC= $(zic) $(ZFLAGS)
ZFLAGS=
# How to use zic to install tz binary files.
# How to use zic to install TZif files.
ZIC_INSTALL= $(ZIC) -d '$(DESTDIR)$(TZDIR)' $(LEAPSECONDS)
# The name of a Posix-compliant 'awk' on your system.
# Older 'mawk' versions, such as the 'mawk' in Ubuntu 16.04, might dump core;
# on Ubuntu you can work around this with
# AWK= gawk
AWK= awk
# The full path name of a Posix-compliant shell, preferably one that supports
@ -410,10 +418,16 @@ SAFE_CHARSET3= 'abcdefghijklmnopqrstuvwxyz{|}~'
SAFE_CHARSET= $(SAFE_CHARSET1)$(SAFE_CHARSET2)$(SAFE_CHARSET3)
SAFE_CHAR= '[]'$(SAFE_CHARSET)'-]'
# These characters are Latin-1, and so are likely to be displayable
# even in editors with limited character sets.
UNUSUAL_OK_LATIN_1 = «°±»½¾×
# This IPA symbol is represented in Unicode as the composition of
# U+0075 and U+032F, and U+032F is not considered alphabetic by some
# grep implementations that do not grok composition.
UNUSUAL_OK_IPA = u̯
# Non-ASCII non-letters that OK_CHAR allows, as these characters are
# useful in commentary. XEmacs 21.5.34 displays them correctly,
# presumably because they are Latin-1.
UNUSUAL_OK_CHARSET= °±½¾×
# useful in commentary.
UNUSUAL_OK_CHARSET= $(UNUSUAL_OK_LATIN_1)$(UNUSUAL_OK_IPA)
# OK_CHAR matches any character allowed in the distributed files.
# This is the same as SAFE_CHAR, except that UNUSUAL_OK_CHARSET and
@ -492,11 +506,14 @@ AWK_SCRIPTS= checklinks.awk checktab.awk leapseconds.awk \
ziguard.awk zishrink.awk
MISC= $(AWK_SCRIPTS) zoneinfo2tdf.pl
TZS_YEAR= 2050
TZS_CUTOFF_FLAG= -c $(TZS_YEAR)
TZS= to$(TZS_YEAR).tzs
TZS_NEW= to$(TZS_YEAR)new.tzs
TZS_DEPS= $(PRIMARY_YDATA) asctime.c localtime.c \
private.h tzfile.h zdump.c zic.c
ENCHILADA= $(COMMON) $(DOCS) $(SOURCES) $(DATA) $(MISC) $(TZS) tzdata.zi
# EIGHT_YARDS is just a yard short of the whole ENCHILADA.
EIGHT_YARDS = $(COMMON) $(DOCS) $(SOURCES) $(DATA) $(MISC) tzdata.zi
ENCHILADA = $(EIGHT_YARDS) $(TZS)
# Consult these files when deciding whether to rebuild the 'version' file.
# This list is not the same as the output of 'git ls-files', since
@ -560,14 +577,21 @@ version: $(VERSION_DEPS)
printf '%s\n' "$$V" >$@.out
mv $@.out $@
# These files can be tailored by setting BACKWARD, PACKRATDATA, etc.
# These files can be tailored by setting BACKWARD and PACKRATDATA.
vanguard.zi main.zi rearguard.zi: $(DSTDATA_ZI_DEPS)
$(AWK) -v DATAFORM=`expr $@ : '\(.*\).zi'` -f ziguard.awk \
$(TDATA) $(PACKRATDATA) >$@.out
mv $@.out $@
tzdata.zi: $(DATAFORM).zi version
# This file has a version comment that attempts to capture any tailoring
# via BACKWARD, DATAFORM, PACKRATDATA, and REDO.
tzdata.zi: $(DATAFORM).zi version zishrink.awk
version=`sed 1q version` && \
LC_ALL=C $(AWK) -v version="$$version" -f zishrink.awk \
LC_ALL=C $(AWK) \
-v dataform='$(DATAFORM)' \
-v deps='$(DSTDATA_ZI_DEPS) zishrink.awk' \
-v redo='$(REDO)' \
-v version="$$version" \
-f zishrink.awk \
$(DATAFORM).zi >$@.out
mv $@.out $@
@ -605,14 +629,16 @@ INSTALLARGS = \
YEARISTYPE='$(YEARISTYPE)' \
ZIC='$(ZIC)'
# 'make install_data' installs one set of tz binary files.
install_data: zic leapseconds yearistype tzdata.zi
INSTALL_DATA_DEPS = zic leapseconds yearistype tzdata.zi
# 'make install_data' installs one set of TZif files.
install_data: $(INSTALL_DATA_DEPS)
$(ZIC_INSTALL) tzdata.zi
posix_only:
posix_only: $(INSTALL_DATA_DEPS)
$(MAKE) $(INSTALLARGS) LEAPSECONDS= install_data
right_only:
right_only: $(INSTALL_DATA_DEPS)
$(MAKE) $(INSTALLARGS) LEAPSECONDS='-L leapseconds' \
install_data
@ -639,7 +665,7 @@ posix_right: posix_only
# This obsolescent rule is present for backwards compatibility with
# tz releases 2014g through 2015g. It should go away eventually.
posix_packrat:
posix_packrat: $(INSTALL_DATA_DEPS)
$(MAKE) $(INSTALLARGS) PACKRATDATA=backzone posix_only
zones: $(REDO)
@ -650,29 +676,33 @@ ZDS = dummy.zd
# Rule used only by submakes invoked by the $(TZS_NEW) rule.
# It is separate so that GNU 'make -j' can run instances in parallel.
$(ZDS): zdump
./zdump -i -c $(TZS_YEAR) '$(wd)/'$$(expr $@ : '\(.*\).zd') >$@
./zdump -i $(TZS_CUTOFF_FLAG) '$(wd)/'$$(expr $@ : '\(.*\).zd') \
>$@
$(TZS_NEW): tzdata.zi zdump zic
rm -fr tzs.dir
mkdir tzs.dir
$(zic) -d tzs.dir tzdata.zi
TZS_NEW_DEPS = tzdata.zi zdump zic
$(TZS_NEW): $(TZS_NEW_DEPS)
rm -fr tzs$(TZS_YEAR).dir
mkdir tzs$(TZS_YEAR).dir
$(zic) -d tzs$(TZS_YEAR).dir tzdata.zi
$(AWK) '/^L/{print "Link\t" $$2 "\t" $$3}' \
tzdata.zi | LC_ALL=C sort >$@.out
wd=`pwd` && \
set x `$(AWK) '/^Z/{print "tzs.dir/" $$2 ".zd"}' tzdata.zi \
x=`$(AWK) '/^Z/{print "tzs$(TZS_YEAR).dir/" $$2 ".zd"}' \
tzdata.zi \
| LC_ALL=C sort -t . -k 2,2` && \
set x $$x && \
shift && \
ZDS=$$* && \
$(MAKE) wd="$$wd" TZS_YEAR=$(TZS_YEAR) ZDS="$$ZDS" $$ZDS && \
sed 's,^TZ=".*tzs\.dir/,TZ=",' $$ZDS >>$@.out
rm -fr tzs.dir
$(MAKE) wd="$$wd" TZS_CUTOFF_FLAG="$(TZS_CUTOFF_FLAG)" \
ZDS="$$ZDS" $$ZDS && \
sed 's,^TZ=".*\.dir/,TZ=",' $$ZDS >>$@.out
rm -fr tzs$(TZS_YEAR).dir
mv $@.out $@
# If $(TZS) does not already exist (e.g., old-format tarballs), create it.
# If it exists but 'make check_tzs' fails, a maintainer should inspect the
# If $(TZS) exists but 'make check_tzs' fails, a maintainer should inspect the
# failed output and fix the inconsistency, perhaps by running 'make force_tzs'.
$(TZS):
$(MAKE) force_tzs
touch $@
force_tzs: $(TZS_NEW)
cp $(TZS_NEW) $(TZS)
@ -711,18 +741,21 @@ check_character_set: $(ENCHILADA)
$(MISC) $(SOURCES) $(WEB_PAGES) \
CONTRIBUTING LICENSE README \
version tzdata.zi && \
! grep -Env $(SAFE_LINE)'|^UNUSUAL_OK_CHARSET='$(OK_CHAR)'*$$' \
! grep -Env $(SAFE_LINE)'|^UNUSUAL_OK_'$(OK_CHAR)'*$$' \
Makefile && \
! grep -Env $(SAFE_SHARP_LINE) $(TDATA_TO_CHECK) backzone \
leapseconds yearistype.sh zone.tab && \
! grep -Env $(OK_LINE) $(ENCHILADA); \
}
touch $@
check_white_space: $(ENCHILADA)
patfmt=' \t|[\f\r\v]' && pat=`printf "$$patfmt\\n"` && \
! grep -En "$$pat" $(ENCHILADA)
! grep -En "$$pat" \
$$(ls $(ENCHILADA) | grep -Fvx leap-seconds.list)
! grep -n '[[:space:]]$$' \
$$(ls $(ENCHILADA) | grep -Fvx leap-seconds.list)
touch $@
PRECEDES_FILE_NAME = ^(Zone|Link[[:space:]]+[^[:space:]]+)[[:space:]]+
FILE_NAME_COMPONENT_TOO_LONG = \
@ -731,6 +764,7 @@ FILE_NAME_COMPONENT_TOO_LONG = \
check_name_lengths: $(TDATA_TO_CHECK) backzone
! grep -En '$(FILE_NAME_COMPONENT_TOO_LONG)' \
$(TDATA_TO_CHECK) backzone
touch $@
CHECK_CC_LIST = { n = split($$1,a,/,/); for (i=2; i<=n; i++) print a[1], a[i]; }
@ -743,52 +777,61 @@ check_sorted: backward backzone iso3166.tab zone.tab zone1970.tab
LC_ALL=C sort -c
$(AWK) '/^[^#]/ $(CHECK_CC_LIST)' zone1970.tab | \
LC_ALL=C sort -cu
touch $@
check_links: checklinks.awk $(TDATA_TO_CHECK) tzdata.zi
$(AWK) -f checklinks.awk $(TDATA_TO_CHECK)
$(AWK) -f checklinks.awk tzdata.zi
touch $@
check_tables: checktab.awk $(PRIMARY_YDATA) $(ZONETABLES)
for tab in $(ZONETABLES); do \
$(AWK) -f checktab.awk -v zone_table=$$tab $(PRIMARY_YDATA) \
|| exit; \
done
touch $@
check_tzs: $(TZS) $(TZS_NEW)
diff -u $(TZS) $(TZS_NEW)
if test -s $(TZS); then \
diff -u $(TZS) $(TZS_NEW); \
else \
cp $(TZS_NEW) $(TZS); \
fi
touch $@
# This checks only the HTML 4.01 strict page.
# To check the the other pages, use <https://validator.w3.org/>.
check_web: tz-how-to.html
$(VALIDATE_ENV) $(VALIDATE) $(VALIDATE_FLAGS) tz-how-to.html
touch $@
# Check that zishrink.awk does not alter the data, and that ziguard.awk
# preserves main-format data.
check_zishrink: zic leapseconds $(PACKRATDATA) $(TDATA) \
$(DATAFORM).zi tzdata.zi
for type in posix right; do \
mkdir -p time_t.dir/$$type time_t.dir/$$type-t \
time_t.dir/$$type-shrunk && \
case $$type in \
right) leap='-L leapseconds';; \
*) leap=;; \
esac && \
$(ZIC) $$leap -d time_t.dir/$$type $(DATAFORM).zi && \
check_zishrink: check_zishrink_posix check_zishrink_right
check_zishrink_posix check_zishrink_right: \
zic leapseconds $(PACKRATDATA) $(TDATA) $(DATAFORM).zi tzdata.zi
rm -fr $@.dir $@-t.dir $@-shrunk.dir
mkdir $@.dir $@-t.dir $@-shrunk.dir
case $@ in \
*_right) leap='-L leapseconds';; \
*) leap=;; \
esac && \
$(ZIC) $$leap -d $@.dir $(DATAFORM).zi && \
$(ZIC) $$leap -d $@-shrunk.dir tzdata.zi && \
case $(DATAFORM) in \
main) \
$(ZIC) $$leap -d time_t.dir/$$type-t $(TDATA) && \
$(ZIC) $$leap -d $@-t.dir $(TDATA) && \
$(AWK) '/^Rule/' $(TDATA) | \
$(ZIC) $$leap -d time_t.dir/$$type-t - \
$(PACKRATDATA) && \
diff -r time_t.dir/$$type time_t.dir/$$type-t;; \
esac && \
$(ZIC) $$leap -d time_t.dir/$$type-shrunk tzdata.zi && \
diff -r time_t.dir/$$type time_t.dir/$$type-shrunk || exit; \
done
rm -fr time_t.dir
$(ZIC) $$leap -d $@-t.dir - $(PACKRATDATA) && \
diff -r $@.dir $@-t.dir;; \
esac
diff -r $@.dir $@-shrunk.dir
rm -fr $@.dir $@-t.dir $@-shrunk.dir
touch $@
clean_misc:
rm -f core *.o *.out \
rm -f *.o *.out $(TIME_T_ALTERNATIVES) \
check_* core typecheck_* \
date tzselect version.h zdump zic yearistype libtz.a
clean: clean_misc
rm -fr *.dir *.zi tzdb-*/ $(TZS_NEW)
@ -818,17 +861,17 @@ $(MANTXTS): workman.sh
LC_ALL=C sh workman.sh `expr $@ : '\(.*\)\.txt$$'` >$@.out
mv $@.out $@
# Set the time stamps to those of the git repository, if available,
# Set the timestamps to those of the git repository, if available,
# and if the files have not changed since then.
# This uses GNU 'touch' syntax 'touch -d@N FILE',
# where N is the number of seconds since 1970.
# If git or GNU 'touch' is absent, don't bother to sync with git timestamps.
# Also, set the timestamp of each prebuilt file like 'leapseconds'
# to be the maximum of the files it depends on.
set-timestamps.out: $(ENCHILADA)
set-timestamps.out: $(EIGHT_YARDS)
rm -f $@
if (type git) >/dev/null 2>&1 && \
files=`git ls-files $(ENCHILADA)` && \
files=`git ls-files $(EIGHT_YARDS)` && \
touch -md @1 test.out; then \
rm -f test.out && \
for file in $$files; do \
@ -846,83 +889,100 @@ set-timestamps.out: $(ENCHILADA)
exit; \
done
touch -cmr `ls -t $(TZDATA_ZI_DEPS) | sed 1q` tzdata.zi
touch -cmr `ls -t $(TZS_DEPS) | sed 1q` $(TZS)
touch -cmr `ls -t $(VERSION_DEPS) | sed 1q` version
touch $@
set-tzs-timestamp.out: $(TZS)
touch -cmr `ls -t $(TZS_DEPS) | sed 1q` $(TZS)
touch $@
# The zics below ensure that each data file can stand on its own.
# We also do an all-files run to catch links to links.
check_public:
$(MAKE) maintainer-clean
$(MAKE) CFLAGS='$(GCC_DEBUG_FLAGS)' ALL
mkdir -p public.dir
for i in $(TDATA_TO_CHECK) tzdata.zi; do \
$(zic) -v -d public.dir $$i 2>&1 || exit; \
done
$(zic) -v -d public.dir $(TDATA_TO_CHECK)
check_public: $(VERSION_DEPS)
rm -fr public.dir
mkdir public.dir
ln $(VERSION_DEPS) public.dir
cd public.dir && $(MAKE) CFLAGS='$(GCC_DEBUG_FLAGS)' ALL
for i in $(TDATA_TO_CHECK) public.dir/tzdata.zi; do \
public.dir/zic -v -d public.dir/zoneinfo $$i 2>&1 || exit; \
done
public.dir/zic -v -d public.dir/zoneinfo-all $(TDATA_TO_CHECK)
rm -fr public.dir
touch $@
# Check that the code works under various alternative
# implementations of time_t.
check_time_t_alternatives:
if diff -q Makefile Makefile 2>/dev/null; then \
quiet_option='-q'; \
else \
quiet_option=''; \
fi && \
check_time_t_alternatives: $(TIME_T_ALTERNATIVES)
$(TIME_T_ALTERNATIVES_TAIL): $(TIME_T_ALTERNATIVES_HEAD)
$(TIME_T_ALTERNATIVES): $(VERSION_DEPS)
rm -fr $@.dir
mkdir $@.dir
ln $(VERSION_DEPS) $@.dir
case $@ in \
int32_t) range=-2147483648,2147483648;; \
u*) range=0,4294967296;; \
*) range=-4294967296,4294967296;; \
esac && \
wd=`pwd` && \
zones=`$(AWK) '/^[^#]/ { print $$3 }' <zone1970.tab` && \
for type in $(TIME_T_ALTERNATIVES); do \
mkdir -p time_t.dir/$$type && \
$(MAKE) clean_misc && \
$(MAKE) TOPDIR="$$wd/time_t.dir/$$type" \
CFLAGS='$(CFLAGS) -Dtime_tz='"'$$type'" \
if test $@ = $(TIME_T_ALTERNATIVES_HEAD); then \
range_target=; \
else \
range_target=to$$range.tzs; \
fi && \
(cd $@.dir && \
$(MAKE) TOPDIR="$$wd/$@.dir" \
CFLAGS='$(CFLAGS) -Dtime_tz='"'$@'" \
REDO='$(REDO)' \
install && \
diff $$quiet_option -r \
time_t.dir/int64_t/etc \
time_t.dir/$$type/etc && \
diff $$quiet_option -r \
time_t.dir/int64_t/usr/share \
time_t.dir/$$type/usr/share && \
case $$type in \
int32_t) range=-2147483648,2147483647;; \
uint32_t) range=0,4294967296;; \
int64_t) continue;; \
*u*) range=0,10000000000;; \
*) range=-10000000000,10000000000;; \
esac && \
echo checking $$type zones ... && \
time_t.dir/int64_t/usr/bin/zdump -V -t $$range $$zones \
>time_t.dir/int64_t.out && \
time_t.dir/$$type/usr/bin/zdump -V -t $$range $$zones \
>time_t.dir/$$type.out && \
diff -u time_t.dir/int64_t.out time_t.dir/$$type.out \
|| exit; \
done
rm -fr time_t.dir
D=$$wd/$@.dir \
TZS_YEAR="$$range" TZS_CUTOFF_FLAG="-t $$range" \
install $$range_target) && \
test $@ = $(TIME_T_ALTERNATIVES_HEAD) || { \
(cd $(TIME_T_ALTERNATIVES_HEAD).dir && \
$(MAKE) TOPDIR="$$wd/$@.dir" \
TZS_YEAR="$$range" TZS_CUTOFF_FLAG="-t $$range" \
D=$$wd/$@.dir \
to$$range.tzs) && \
diff -u $(TIME_T_ALTERNATIVES_HEAD).dir/to$$range.tzs \
$@.dir/to$$range.tzs && \
if diff -q Makefile Makefile 2>/dev/null; then \
quiet_option='-q'; \
else \
quiet_option=''; \
fi && \
diff $$quiet_option -r $(TIME_T_ALTERNATIVES_HEAD).dir/etc \
$@.dir/etc && \
diff $$quiet_option -r \
$(TIME_T_ALTERNATIVES_HEAD).dir/usr/share \
$@.dir/usr/share; \
}
touch $@
TRADITIONAL_ASC = \
tzcode$(VERSION).tar.gz.asc \
tzdata$(VERSION).tar.gz.asc
ALL_ASC = $(TRADITIONAL_ASC) \
tzdata$(VERSION)-rearguard.tar.gz.asc \
REARGUARD_ASC = \
tzdata$(VERSION)-rearguard.tar.gz.asc
ALL_ASC = $(TRADITIONAL_ASC) $(REARGUARD_ASC) \
tzdb-$(VERSION).tar.lz.asc
tarballs traditional_tarballs signatures traditional_signatures: version
tarballs rearguard_tarballs traditional_tarballs \
signatures rearguard_signatures traditional_signatures: \
version set-timestamps.out rearguard.zi
VERSION=`cat version` && \
$(MAKE) VERSION="$$VERSION" $@_version
# These *_version rules are intended for use if VERSION is set by some
# other means. Ordinarily these rules are used only by the above
# non-_version rules, which set VERSION on the 'make' command line.
tarballs_version: traditional_tarballs_version \
tzdata$(VERSION)-rearguard.tar.gz \
tarballs_version: traditional_tarballs_version rearguard_tarballs_version \
tzdb-$(VERSION).tar.lz
rearguard_tarballs_version: \
tzdata$(VERSION)-rearguard.tar.gz
traditional_tarballs_version: \
tzcode$(VERSION).tar.gz tzdata$(VERSION).tar.gz
signatures_version: $(ALL_ASC)
rearguard_signatures_version: $(REARGUARD_ASC)
traditional_signatures_version: $(TRADITIONAL_ASC)
tzcode$(VERSION).tar.gz: set-timestamps.out
@ -958,7 +1018,7 @@ tzdata$(VERSION)-rearguard.tar.gz: rearguard.zi set-timestamps.out
gzip $(GZIPFLAGS)) >$@.out
mv $@.out $@
tzdb-$(VERSION).tar.lz: set-timestamps.out
tzdb-$(VERSION).tar.lz: set-timestamps.out set-tzs-timestamp.out
rm -fr tzdb-$(VERSION)
mkdir tzdb-$(VERSION)
ln $(ENCHILADA) tzdb-$(VERSION)
@ -972,16 +1032,26 @@ tzdata$(VERSION).tar.gz.asc: tzdata$(VERSION).tar.gz
tzdata$(VERSION)-rearguard.tar.gz.asc: tzdata$(VERSION)-rearguard.tar.gz
tzdb-$(VERSION).tar.lz.asc: tzdb-$(VERSION).tar.lz
$(ALL_ASC):
gpg --armor --detach-sign $?
gpg2 --armor --detach-sign $?
typecheck:
$(MAKE) clean
for i in "long long" unsigned; \
do \
$(MAKE) CFLAGS="-DTYPECHECK -D__time_t_defined -D_TIME_T \"-Dtime_t=$$i\"" ; \
./zdump -v Europe/Rome ; \
$(MAKE) clean ; \
done
TYPECHECK_CFLAGS = $(CFLAGS) -DTYPECHECK -D__time_t_defined -D_TIME_T
typecheck: typecheck_long_long typecheck_unsigned
typecheck_long_long typecheck_unsigned: $(VERSION_DEPS)
rm -fr $@.dir
mkdir $@.dir
ln $(VERSION_DEPS) $@.dir
cd $@.dir && \
case $@ in \
*_long_long) i="long long";; \
*_unsigned ) i="unsigned" ;; \
esac && \
typecheck_cflags='' && \
$(MAKE) \
CFLAGS="$(TYPECHECK_CFLAGS) \"-Dtime_t=$$i\"" \
TOPDIR="`pwd`" \
install
$@.dir/zdump -i -c 1970,1971 Europe/Rome
touch $@
zonenames: tzdata.zi
@$(AWK) '/^Z/ { print $$2 } /^L/ { print $$3 }' tzdata.zi
@ -997,14 +1067,14 @@ zic.o: private.h tzfile.h version.h
.KEEP_STATE:
.PHONY: ALL INSTALL all
.PHONY: check check_character_set check_links check_name_lengths
.PHONY: check_public check_sorted check_tables
.PHONY: check_time_t_alternatives check_tzs check_web check_white_space
.PHONY: check check_time_t_alternatives
.PHONY: check_zishrink
.PHONY: clean clean_misc dummy.zd force_tzs
.PHONY: install install_data maintainer-clean names
.PHONY: posix_only posix_packrat posix_right
.PHONY: public right_only right_posix signatures signatures_version
.PHONY: posix_only posix_packrat posix_right public
.PHONY: rearguard_signatures rearguard_signatures_version
.PHONY: rearguard_tarballs rearguard_tarballs_version
.PHONY: right_only right_posix signatures signatures_version
.PHONY: tarballs tarballs_version
.PHONY: traditional_signatures traditional_signatures_version
.PHONY: traditional_tarballs traditional_tarballs_version

311
NEWS
View File

@ -1,5 +1,136 @@
News for the tz database
Release 2018f - 2018-10-18 00:14:18 -0700
Briefly:
Volgograd moves from +03 to +04 on 2018-10-28.
Fiji ends DST 2019-01-13, not 2019-01-20.
Most of Chile changes DST dates, effective 2019-04-06.
Changes to future timestamps
Volgograd moves from +03 to +04 on 2018-10-28 at 02:00.
(Thanks to Alexander Fetisov and Stepan Golosunov.)
Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously
predicted. (Thanks to Raymond Kumar.) Adjust future predictions
accordingly.
Most of Chile will end DST on the first Saturday in April at 24:00 mainland
time, and resume DST on the first Saturday in September at 24:00 mainland
time. The changes are effective from 2019-04-06, and do not affect the
Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa
and Tim Parenti.) Adjust future predictions accordingly.
Changes to past timestamps
The 2018-05-05 North Korea 30-minute time zone change took place
at 23:30 the previous day, not at 00:00 that day.
China's 1988 spring-forward transition was on April 17, not
April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00.
(Thanks to P Chan.)
Fix several issues for Macau before 1992. Macau's pre-1904 LMT
was off by 10 s. Macau switched to +08 in 1904 not 1912, and
temporarily switched to +09/+10 during World War II. Macau
observed DST in 1942/79, not 1961/80, and there were several
errors for transition times and dates. (Thanks to P Chan.)
The 1948-1951 fallback transitions in Japan were at 25:00 on
September's second Saturday, not at 24:00. (Thanks to Phake Nick.)
zic turns this into 01:00 on the day after September's second
Saturday, which is the best that POSIX or C platforms can do.
Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014
paper by Li Yu, replacing more-questionable data from Shanks.
Changes to time zone abbreviations
Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.)
Changes to code
zic now always generates TZif files where time type 0 is used for
timestamps before the first transition. This simplifies the
reading of TZif files and should not affect behavior of existing
TZif readers because the same set of time types is used; only
their internal indexes may have changed. This affects only the
legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and
EET, which previously used nonzero types for these timestamps.
Because of the type 0 change, zic no longer outputs a dummy
transition at time -2**59 (before the Big Bang), as clients should
no longer need this to handle historical timestamps correctly.
This reverts a change introduced in 2013d and shrinks most TZif
files by a few bytes.
zic now supports negative time-of-day in Rule and Leap lines, e.g.,
"Rule X min max - Apr lastSun -6:00 1:00 -" means the transition
occurs at 18:00 on the Saturday before the last Sunday in April.
This behavior was documented in 2018a but the code did not
entirely match the documentation.
localtime.c no longer requires at least one time type in TZif
files that lack transitions or have a POSIX-style TZ string. This
future-proofs the code against possible future extensions to the
format that would allow TZif files with POSIX-style TZ strings and
without transitions or time types.
A read-access subscript error in localtime.c has been fixed.
It could occur only in TZif files with timecnt == 0, something that
does not happen in practice now but could happen in future versions.
localtime.c no longer ignores TZif POSIX-style TZ strings that
specify only standard time. Instead, these TZ strings now
override the default time type for timestamps after the last
transition (or for all time stamps if there are no transitions),
just as DST strings specifying DST have always done.
leapseconds.awk now outputs "#updated" and "#expires" comments,
and supports leap seconds at the ends of months other than June
and December. (Inspired by suggestions from Chris Woodbury.)
Changes to documentation
New restrictions: A Rule name must start with a character that
is neither an ASCII digit nor "-" nor "+", and an unquoted name
should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~".
The latter restriction makes room for future extensions (a
possibility noted by Tom Lane).
tzfile.5 now documents what time types apply before the first and
after the last transition, if any.
Documentation now uses the spelling "timezone" for a TZ setting
that determines timestamp history, and "time zone" for a
geographic region currently sharing the same standard time.
The name "TZif" is now used for the tz binary data format.
tz-link.htm now mentions the A0 TimeZone Migration utilities.
(Thanks to Aldrin Martoq for the link.)
Changes to build procedure
New 'make' target 'rearguard_tarballs' to build the rearguard
tarball only. This is a convenience on platforms that lack lzip
if you want to build the rearguard tarball. (Problem reported by
Deborah Goldsmith.)
tzdata.zi is now more stable from release to release. (Problem
noted by Tom Lane.) It is also a bit shorter.
tzdata.zi now can contain comment lines documenting configuration
information, such as which data format was selected, which input
files were used, and how leap seconds are treated. (Problems
noted by Lester Caine and Brian Inglis.) If the Makefile defaults
are used these comment lines are absent, for backward
compatibility. A redistributor intending to alter its copy of the
files should also append "-LABEL" to the 'version' file's first
line, where "LABEL" identifies the redistributor's change.
Release 2018e - 2018-05-01 23:42:51 -0700
Briefly:
@ -9,7 +140,7 @@ Release 2018e - 2018-05-01 23:42:51 -0700
'make tarballs' now also builds a rearguard tarball.
New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines.
Changes to past and future time stamps
Changes to past and future timestamps
North Korea switches back from +0830 to +09 on 2018-05-05.
(Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon,
@ -17,9 +148,9 @@ Release 2018e - 2018-05-01 23:42:51 -0700
Bring back the negative-DST changes of 2018a, except be more
compatible with data parsers that do not support negative DST.
Also, this now affects historical time stamps in Namibia and the
Also, this now affects historical timestamps in Namibia and the
former Czechoslovakia, not just Ireland. The main format now uses
negative DST to model time stamps in Europe/Dublin (from 1971 on),
negative DST to model timestamps in Europe/Dublin (from 1971 on),
Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This
does not affect UT offsets, only time zone abbreviations and the
tm_isdst flag. Also, this does not affect rearguard or vanguard
@ -44,7 +175,7 @@ Release 2018e - 2018-05-01 23:42:51 -0700
in tzdata, it could be used to specify the legal time in Namibia
1994-2017, as opposed to the popular time (see below).
Changes to past time stamps
Changes to past timestamps
From 1994 through 2017 Namibia observed DST in winter, not summer.
That is, it used negative DST, as Ireland still does. This change
@ -54,12 +185,12 @@ Release 2018e - 2018-05-01 23:42:51 -0700
both simply called "standard time" in Namibian law, in common
practice winter time was considered to be DST (as noted by Stephen
Colebourne). The full effect of this change is only in vanguard
format; in rearguard and main format, the tm_isdst flag is still
and main format; in rearguard format, the tm_isdst flag is still
zero in winter and nonzero in summer.
In 1946/7 Czechoslovakia also observed negative DST in winter.
The full effect of this change is only in vanguard format; in
rearguard and main formats, it is modeled as plain GMT without
The full effect of this change is only in vanguard and main
formats; in rearguard format, it is modeled as plain GMT without
daylight saving. Also, the dates of some 1944/5 DST transitions
in Czechoslovakia have been changed.
@ -72,17 +203,17 @@ Release 2018d - 2018-03-22 07:05:46 -0700
Add support for vanguard and rearguard data consumers.
Add subsecond precision to source data format, though not to data.
Changes to future time stamps
Changes to future timestamps
In 2018, Palestine starts DST on March 24, not March 31.
Adjust future predictions accordingly. (Thanks to Sharef Mustafa.)
Changes to past and future time stamps
Changes to past and future timestamps
Casey Station in Antarctica changed from +11 to +08 on 2018-03-11
at 04:00. (Thanks to Steffen Thorsen.)
Changes to past time stamps
Changes to past timestamps
Historical transitions for Uruguay, represented by
America/Montevideo, have been updated per official legal documents,
@ -224,7 +355,7 @@ Release 2018c - 2018-01-22 23:00:44 -0800
change is reapplied. (Problems reported by Deborah Goldsmith and
Stephen Colebourne.)
Changes to past time stamps
Changes to past timestamps
Japanese DST transitions (1948-1951) were Sundays at 00:00, not
Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.)
@ -256,18 +387,18 @@ Release 2018a - 2018-01-12 22:29:21 -0800
Use Debian-style installation locations, instead of 4.3BSD-style.
New zic option -t.
Changes to past and future time stamps
Changes to past and future timestamps
São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at
01:00. (Thanks to Steffen Thorsen and Michael Deckers.)
Changes to future time stamps
Changes to future timestamps
Starting in 2018 southern Brazil will begin DST on November's
first Sunday instead of October's third Sunday. (Thanks to
Steffen Thorsen.)
Changes to past time stamps
Changes to past timestamps
A discrepancy of 4 s in timestamps before 1931 in South Sudan has
been corrected. The 'backzone' and 'zone.tab' files did not agree
@ -355,7 +486,7 @@ Release 2017c - 2017-10-20 14:49:34 -0700
A new file tzdata.zi now holds a small text copy of all data.
The zic input format has been regularized slightly.
Changes to future time stamps
Changes to future timestamps
Northern Cyprus has decided to resume EU rules starting
2017-10-29, thus reinstituting winter time.
@ -381,7 +512,7 @@ Release 2017c - 2017-10-20 14:49:34 -0700
2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04
at 02:00. (Thanks to Steffen Thorsen.)
Changes to past time stamps
Changes to past timestamps
Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03.
(Thanks to Arthur David Olson.)
@ -511,11 +642,11 @@ Release 2017b - 2017-03-17 07:30:38 -0700
Briefly: Haiti has resumed DST.
Changes to past and future time stamps
Changes to past and future timestamps
Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.)
Changes to past time stamps
Changes to past timestamps
Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01.
@ -527,7 +658,7 @@ Release 2017b - 2017-03-17 07:30:38 -0700
The reference localtime implementation now falls back on the
current US daylight-saving transition rules rather than the
1987-2006 rules. This fallback occurs only when (1) the TZ
environment variable's value has a name like "AST4ADT" that asks
environment variable has a value like "AST4ADT" that asks
for daylight saving time but does not specify the rules, (2) there
is no file by that name, and (3) the TZDEFRULES file cannot be
loaded. (Thanks to Tom Lane.)
@ -538,7 +669,7 @@ Release 2017a - 2017-02-28 00:05:36 -0800
Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia
discontinues DST.
Changes to future time stamps
Changes to future timestamps
Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.)
@ -549,12 +680,12 @@ Release 2017a - 2017-02-28 00:05:36 -0800
assume it's permanent. (Thanks to Juan Correa and Deborah
Goldsmith.) This also affects Antarctica/Palmer.
Changes to past time stamps
Changes to past timestamps
Fix many entries for historical time stamps for Europe/Madrid
Fix many entries for historical timestamps for Europe/Madrid
before 1979, to agree with tables compiled by Pere Planesas of the
National Astronomical Observatory of Spain. As a side effect,
this changes some time stamps for Africa/Ceuta before 1929, which
this changes some timestamps for Africa/Ceuta before 1929, which
are probably guesswork anyway. (Thanks to Steve Allen and
Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for
correcting the 1901 transition.)
@ -645,13 +776,13 @@ Release 2016j - 2016-11-22 23:17:13 -0800
Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.
Changes to future time stamps
Changes to future timestamps
Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
This hives off a new zone Europe/Saratov from Europe/Volgograd.
(Thanks to Yuri Konotopov and Stepan Golosunov.)
Changes to past time stamps
Changes to past timestamps
The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring
@ -687,7 +818,7 @@ Release 2016i - 2016-11-01 23:19:52 -0700
Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
reintroduces DST on 2016-11-06.
Changes to future time stamps
Changes to future timestamps
Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
2017-01-15 at 03:00. Assume future observances in Tonga will be
@ -695,7 +826,7 @@ Release 2016i - 2016-11-01 23:19:52 -0700
January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric
time zone abbreviations for this zone.
Changes to past and future time stamps
Changes to past and future timestamps
Northern Cyprus is now +03 year round, causing a split in Cyprus
time zones starting 2016-10-30 at 04:00. This creates a zone
@ -704,9 +835,9 @@ Release 2016i - 2016-11-01 23:19:52 -0700
Antarctica/Casey switched from +08 to +11 on 2016-10-22.
(Thanks to Steffen Thorsen.)
Changes to past time stamps
Changes to past timestamps
Several corrections were made for pre-1975 time stamps in Italy.
Several corrections were made for pre-1975 timestamps in Italy.
These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
Europe/Vatican.
@ -744,7 +875,7 @@ Release 2016i - 2016-11-01 23:19:52 -0700
Release 2016h - 2016-10-19 23:17:57 -0700
Changes to future time stamps
Changes to future timestamps
Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that
@ -752,7 +883,7 @@ Release 2016h - 2016-10-19 23:17:57 -0700
at 01:00, which is consistent with predicted spring transitions
on the last Saturday of March. (Thanks to Tim Parenti.)
Changes to past time stamps
Changes to past timestamps
In Turkey, transitions in 1986-1990 were at 01:00 standard time
not at 02:00, and the spring 1994 transition was on March 20, not
@ -801,7 +932,7 @@ Release 2016h - 2016-10-19 23:17:57 -0700
Release 2016g - 2016-09-13 08:56:38 -0700
Changes to future time stamps
Changes to future timestamps
Turkey switched from EET/EEST (+02/+03) to permanent +03,
effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather
@ -810,7 +941,7 @@ Release 2016g - 2016-09-13 08:56:38 -0700
New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
(Thanks to Tim Parenti.)
Changes to past time stamps
Changes to past timestamps
For America/Los_Angeles, spring-forward transition times have been
corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
@ -859,9 +990,9 @@ Release 2016g - 2016-09-13 08:56:38 -0700
zic no longer generates binary files containing POSIX TZ-like
strings that disagree with the local time type after the last
explicit transition in the data. This fixes a bug with
Africa/Casablanca and Africa/El_Aaiun in some year-2037 time
stamps on the reference platform. (Thanks to Alexander Belopolsky
for reporting the bug and suggesting a way forward.)
Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps
on the reference platform. (Thanks to Alexander Belopolsky for
reporting the bug and suggesting a way forward.)
If the installed localtime and/or posixrules files are symbolic
links, zic now keeps them symbolic links when updating them, for
@ -924,7 +1055,7 @@ Release 2016g - 2016-09-13 08:56:38 -0700
Release 2016f - 2016-07-05 16:26:51 +0200
Changes affecting future time stamps
Changes affecting future timestamps
The Egyptian government changed its mind on short notice, and
Africa/Cairo will not introduce DST starting 2016-07-07 after all.
@ -933,12 +1064,12 @@ Release 2016f - 2016-07-05 16:26:51 +0200
Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
(Thanks to Stepan Golosunov.)
Changes to past and future time stamps
Changes to past and future timestamps
Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
abbreviations instead of invented ones.
Changes affecting past time stamps
Changes affecting past timestamps
Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
(Thanks to Stepan Golosunov.)
@ -946,14 +1077,14 @@ Release 2016f - 2016-07-05 16:26:51 +0200
Release 2016e - 2016-06-14 08:46:16 -0700
Changes affecting future time stamps
Changes affecting future timestamps
Africa/Cairo observes DST in 2016 from July 7 to the end of October.
Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.)
For future years, guess April's last Thursday to October's last
Thursday except for Ramadan.
Changes affecting past time stamps
Changes affecting past timestamps
Locations while uninhabited now use '-00', not 'zzz', as a
placeholder time zone abbreviation. This is inspired by Internet
@ -982,7 +1113,7 @@ Release 2016e - 2016-06-14 08:46:16 -0700
Release 2016d - 2016-04-17 22:50:29 -0700
Changes affecting future time stamps
Changes affecting future timestamps
America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
(Thanks to Alexander Krivenyshev for the heads-up.)
@ -994,7 +1125,7 @@ Release 2016d - 2016-04-17 22:50:29 -0700
Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
at 02:00. (Thanks to Stepan Golosunov.)
Changes affecting past time stamps
Changes affecting past timestamps
New zone Europe/Kirov, split off from Europe/Volgograd. It covers
Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
@ -1017,7 +1148,7 @@ Release 2016d - 2016-04-17 22:50:29 -0700
Release 2016c - 2016-03-23 00:51:27 -0700
Changes affecting future time stamps
Changes affecting future timestamps
Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.)
@ -1028,7 +1159,7 @@ Release 2016c - 2016-03-23 00:51:27 -0700
2014-09-07 through 2016-05-14 daylight saving time instead of
standard time, as that seems more appropriate now.
Changes affecting past time stamps
Changes affecting past timestamps
Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
+02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed
@ -1053,7 +1184,7 @@ Release 2016b - 2016-03-12 17:30:14 -0800
POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the
warnings is to upgrade to zic derived from tz releases 2015f and later.
Changes affecting future time stamps
Changes affecting future timestamps
New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
@ -1077,7 +1208,7 @@ Release 2016b - 2016-03-12 17:30:14 -0800
(Thanks to Hannah Kreitem.) Guess future transitions will be March's last
Saturday at 01:00, not March's last Friday at 24:00.
Changes affecting past time stamps
Changes affecting past timestamps
Europe/Chisinau observed DST during 1990, and switched from +04 to
+03 at 1990-05-06 02:00, instead of switching from +03 to +02.
@ -1112,7 +1243,7 @@ Release 2016b - 2016-03-12 17:30:14 -0800
Release 2016a - 2016-01-26 23:28:02 -0800
Changes affecting future time stamps
Changes affecting future timestamps
America/Cayman will not observe daylight saving this year after all.
Revert our guess that it would. (Thanks to Matt Johnson.)
@ -1124,7 +1255,7 @@ Release 2016a - 2016-01-26 23:28:02 -0800
to be March 21 00:00 to September 21 00:00. This is likely better
than predicting no DST, albeit off by a day every now and then.
Changes affecting past and future time stamps
Changes affecting past and future timestamps
America/Metlakatla switched from PST all year to AKST/AKDT on
2015-11-01 at 02:00. (Thanks to Steffen Thorsen.)
@ -1133,7 +1264,7 @@ Release 2016a - 2016-01-26 23:28:02 -0800
backward compatibility link to America/Tijuana. Its contents were
apparently based on a misreading of Mexican legislation.
Changes affecting past time stamps
Changes affecting past timestamps
Asia/Karachi's two transition times in 2002 were off by a minute.
(Thanks to Matt Johnson.)
@ -1167,7 +1298,7 @@ Release 2016a - 2016-01-26 23:28:02 -0800
Release 2015g - 2015-10-01 00:39:51 -0700
Changes affecting future time stamps
Changes affecting future timestamps
Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
(Thanks to Fatih.)
@ -1182,7 +1313,7 @@ Release 2015g - 2015-10-01 00:39:51 -0700
effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
New zone America/Fort_Nelson. (Thanks to Matt Johnson.)
Changes affecting past time stamps
Changes affecting past timestamps
Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
@ -1212,7 +1343,7 @@ Release 2015g - 2015-10-01 00:39:51 -0700
Release 2015f - 2015-08-10 18:06:56 -0700
Changes affecting future time stamps
Changes affecting future timestamps
North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)
The abbreviation remains "KST". (Thanks to Robert Elz.)
@ -1220,7 +1351,7 @@ Release 2015f - 2015-08-10 18:06:56 -0700
Uruguay no longer observes DST. (Thanks to Steffen Thorsen
and Pablo Camargo.)
Changes affecting past and future time stamps
Changes affecting past and future timestamps
Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
(Thanks to Roman Tudos.)
@ -1279,7 +1410,7 @@ Release 2015f - 2015-08-10 18:06:56 -0700
Release 2015e - 2015-06-13 10:56:02 -0700
Changes affecting future time stamps
Changes affecting future timestamps
Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
@ -1307,13 +1438,13 @@ Release 2015e - 2015-06-13 10:56:02 -0700
Release 2015d - 2015-04-24 08:09:46 -0700
Changes affecting future time stamps
Changes affecting future timestamps
Egypt will not observe DST in 2015 and will consider canceling it
permanently. For now, assume no DST indefinitely.
(Thanks to Ahmed Nazmy and Tim Parenti.)
Changes affecting past time stamps
Changes affecting past timestamps
America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
1966-07-01. Also, Yukon's time zone history is documented better.
@ -1333,16 +1464,16 @@ Release 2015d - 2015-04-24 08:09:46 -0700
Release 2015c - 2015-04-11 08:55:55 -0700
Changes affecting future time stamps
Changes affecting future timestamps
Egypt's spring-forward transition is at 24:00 on April's last Thursday,
not 00:00 on April's last Friday. 2015's transition will therefore be on
Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
Changes affecting past time stamps
Changes affecting past timestamps
The following changes affect some pre-1991 Chile-related time stamps
The following changes affect some pre-1991 Chile-related timestamps
in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
The 1910 transition was January 10, not January 1.
@ -1367,8 +1498,8 @@ Release 2015c - 2015-04-11 08:55:55 -0700
since we have no data suggesting that they existed.
One more zone has been turned into a link, as it differed
from an existing zone only for older time stamps. As usual,
this change affects UT offsets in pre-1970 time stamps only.
from an existing zone only for older timestamps. As usual,
this change affects UT offsets in pre-1970 timestamps only.
The zone's old contents have been moved to the 'backzone' file.
The affected zone is America/Montreal.
@ -1381,7 +1512,7 @@ Release 2015c - 2015-04-11 08:55:55 -0700
Release 2015b - 2015-03-19 23:28:11 -0700
Changes affecting future time stamps
Changes affecting future timestamps
Mongolia will start observing DST again this year, from the last
Saturday in March at 02:00 to the last Saturday in September at 00:00.
@ -1391,14 +1522,14 @@ Release 2015b - 2015-03-19 23:28:11 -0700
correct the fall 2014 transition from September 26 to October 24.
Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
Changes affecting past time stamps
Changes affecting past timestamps
The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
regression. (Thanks to Stuart Bishop for reporting the problem.)
Some more zones have been turned into links, when they differed
from existing zones only for older time stamps. As usual,
these changes affect UT offsets in pre-1970 time stamps only.
from existing zones only for older timestamps. As usual,
these changes affect UT offsets in pre-1970 timestamps only.
Their old contents have been moved to the 'backzone' file.
The affected zones are: America/Antigua, America/Cayman,
Pacific/Midway, and Pacific/Saipan.
@ -1429,7 +1560,7 @@ Release 2015b - 2015-03-19 23:28:11 -0700
Release 2015a - 2015-01-29 22:35:20 -0800
Changes affecting future time stamps
Changes affecting future timestamps
The Mexican state of Quintana Roo, represented by America/Cancun,
will shift from Central Time with DST to Eastern Time without DST
@ -1442,15 +1573,15 @@ Release 2015a - 2015-01-29 22:35:20 -0800
New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
(Thanks to Tim Parenti.)
Changes affecting past time stamps
Changes affecting past timestamps
Iceland observed DST in 1919 and 1921, and its 1939 fallback
transition was Oct. 29, not Nov. 29. Remove incorrect data from
Shanks about time in Iceland between 1837 and 1908.
Some more zones have been turned into links, when they differed
from existing zones only for older time stamps. As usual,
these changes affect UT offsets in pre-1970 time stamps only.
from existing zones only for older timestamps. As usual,
these changes affect UT offsets in pre-1970 timestamps only.
Their old contents have been moved to the 'backzone' file.
The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
and Asia/Muscat.
@ -1481,23 +1612,23 @@ Release 2015a - 2015-01-29 22:35:20 -0800
Release 2014j - 2014-11-10 17:37:11 -0800
Changes affecting current and future time stamps
Changes affecting current and future timestamps
Turks & Caicos' switch from US eastern time to UT -04 year-round
did not occur on 2014-11-02 at 02:00. It's currently scheduled
for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
Changes affecting past time stamps
Changes affecting past timestamps
Many pre-1989 time stamps have been corrected for Asia/Seoul and
Many pre-1989 timestamps have been corrected for Asia/Seoul and
Asia/Pyongyang, based on sources for the Korean-language Wikipedia
entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
longer guess that Pyongyang mimicked Seoul time after World War II,
as this is politically implausible.
Some more zones have been turned into links, when they differed
from existing zones only for older time stamps. As usual,
these changes affect UT offsets in pre-1970 time stamps only.
from existing zones only for older timestamps. As usual,
these changes affect UT offsets in pre-1970 timestamps only.
Their old contents have been moved to the 'backzone' file.
The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
@ -1512,7 +1643,7 @@ Release 2014j - 2014-11-10 17:37:11 -0800
Release 2014i - 2014-10-21 22:04:57 -0700
Changes affecting future time stamps
Changes affecting future timestamps
Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
(Thanks to Ken Rylander for the heads-up.) Guess that future
@ -1532,17 +1663,17 @@ Release 2014i - 2014-10-21 22:04:57 -0700
The new abbreviation IDT stands for the pre-1976 use of UT +08 in
Indochina, to distinguish it better from ICT (+07).
Changes affecting past time stamps
Changes affecting past timestamps
Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976
(thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
authoritative book). Asia/Ho_Chi_Minh has been added to
zone1970.tab, to give tzselect users in Vietnam two choices,
since north and south Vietnam disagreed after our 1970 cutoff.
Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
they differed from existing zones only for older time stamps. As
usual, these changes affect pre-1970 time stamps only. Their old
they differed from existing zones only for older timestamps. As
usual, these changes affect pre-1970 timestamps only. Their old
contents have been moved to the 'backzone' file.
Changes affecting code
@ -1682,7 +1813,7 @@ Release 2014g - 2014-08-28 12:31:23 -0700
Unless NETBSD_INSPIRED is defined to 0, the tz library now
supplies functions for creating and using objects that represent
time zones. The new functions are tzalloc, tzfree, localtime_rz,
timezones. The new functions are tzalloc, tzfree, localtime_rz,
mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
time2posix_z. They are intended for performance: for example,
localtime_rz (unlike localtime_r) is trivially thread-safe without
@ -1696,7 +1827,7 @@ Release 2014g - 2014-08-28 12:31:23 -0700
TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
zdump now uses localtime_rz if available, as it's significantly faster,
and it can help zdump better diagnose invalid time zone names.
and it can help zdump better diagnose invalid timezone names.
Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
not available, zdump now uses localtime_r and tzset if available,
@ -1712,7 +1843,7 @@ Release 2014g - 2014-08-28 12:31:23 -0700
invalid or outlandish input.
The tz library no longer mishandles leap seconds on platforms with
unsigned time_t in time zones that lack ordinary transitions after 1970.
unsigned time_t in timezones that lack ordinary transitions after 1970.
The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
already defined, to make it easier to configure on common platforms.
@ -2036,8 +2167,8 @@ Release 2014d - 2014-05-27 21:34:40 -0700
Changes affecting code
zic no longer generates files containing timestamps before the Big Bang.
This works around GNOME bug 730332
<https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
This works around GNOME glib bug 878
<https://gitlab.gnome.org/GNOME/glib/issues/878>
(Thanks to Leonardo Chiquitto for reporting the bug, and to
Arthur David Olson and James Cloos for suggesting improvements to the fix.)
@ -3490,7 +3621,7 @@ Release 2005j - 2005-06-13 14:34:13 -0400
These reflect changes to limit the length of time zone abbreviations
and the characters used in those abbreviations.
There are also changes to handle POSIX-style "quoted" time zone
There are also changes to handle POSIX-style "quoted" timezone
environment variables.
The changes were circulated on the time zone mailing list; the only
@ -3816,7 +3947,7 @@ Release 1999f - 1999-09-23 09:48:14 -0400
Release 1999e - 1999-08-17 15:20:54 -0400
changes circulated by Paul Eggert, although the change to handling
of DST-specifying time zone names has been commented out for now
of DST-specifying timezone names has been commented out for now
(search for "XXX" in "localtime.c" for details). These files also
do not make any changes to the start of DST in Brazil.
@ -3941,7 +4072,7 @@ Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
minor changes to put "TZif" at the start of each time zone information file
minor changes to put "TZif" at the start of each timezone information file
a rule has also been added to the Makefile so you can
make zones
@ -4451,8 +4582,8 @@ consisting of a single tarball tzdb-R.tar.lz with extra data.
Release timestamps are taken from the release's commit (for newer,
Git-based releases), from the newest file in the tarball (for older
releases, where this info is available) or from the email announcing
the release (if all else fails; these are marked with a time zone of
-0000 and an "is missing!" comment).
the release (if all else fails; these are marked with a time zone
abbreviation of -0000 and an "is missing!" comment).
Earlier versions of the code and data were not announced on the tz
list and are not summarized here.

16
README
View File

@ -4,7 +4,7 @@ README for the tz distribution
"Any time you want it to be." -- Frank Baxter as The Scientist
(from the Bell System film "About Time")
The Time Zone Database (often called tz or zoneinfo) contains code and
The Time Zone Database (called tz, tzdb or zoneinfo) contains code and
data that represent the history of local time for many representative
locations around the globe. It is updated periodically to reflect
changes made by political bodies to time zone boundaries, UTC offsets,
@ -20,17 +20,15 @@ substituting your desired installation directory for "$HOME/tzdir":
make TOPDIR=$HOME/tzdir install
$HOME/tzdir/usr/bin/zdump -v America/Los_Angeles
Historical local time information has been included here to:
This database of historical local time information has several goals:
* provide a compendium of data about the history of civil time
that is useful even if not 100% accurate;
* Provide a compendium of data about the history of civil time that
is useful even if not 100% accurate.
* give an idea of the variety of local time rules that have
existed in the past and thus an idea of the variety that may be
expected in the future;
* Give an idea of the variety of local time rules that have existed
in the past and thus may be expected in the future.
* provide a test of the generality of the local time rule description
system.
* Test the generality of the local time rule description system.
The information in the time zone data files is by no means authoritative;
fixes and enhancements are welcome. Please see the file CONTRIBUTING

25
africa
View File

@ -1,3 +1,5 @@
# tzdb data for Africa and environs
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.
@ -6,7 +8,7 @@
# tz@iana.org for general use in the future). For more, please see
# the file CONTRIBUTING in the tz distribution.
# From Paul Eggert (2017-04-09):
# From Paul Eggert (2018-05-27):
#
# Unless otherwise specified, the source for data through 1990 is:
# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
@ -51,13 +53,15 @@
# I vaguely recall 'WAT' also being used for -01 in the past but
# cannot now come up with solid citations.
#
# I invented the following abbreviations; corrections are welcome!
# +02 WAST West Africa Summer Time (no longer used)
# +03 CAST Central Africa Summer Time (no longer used)
# +03 SAST South Africa Summer Time (no longer used)
# I invented the following abbreviations in the 1990s:
# +02 WAST West Africa Summer Time
# +03 CAST Central Africa Summer Time
# +03 SAST South Africa Summer Time
# +03 EAT East Africa Time
# 'EAT' also seems to have caught on; the others are rare but are paired
# with better-attested non-DST abbreviations.
# 'EAT' seems to have caught on and is in current timestamps, and though
# the other abbreviations are rarer and are only in past timestamps,
# they are paired with better-attested non-DST abbreviations.
# Corrections are welcome.
# Algeria
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
@ -362,6 +366,13 @@ Zone Africa/Cairo 2:05:09 - LMT 1900 Oct
# Eritrea
# Ethiopia
# See Africa/Nairobi.
#
# Unfortunately tzdb records only Western clock time in use in Ethiopia,
# as the tzdb format is not up to properly recording a common Ethiopian
# timekeeping practice that is based on solar time. See:
# Mortada D. If you have a meeting in Ethiopia, you'd better double
# check the time. PRI's The World. 2015-01-30 15:15 -05.
# https://www.pri.org/stories/2015-01-30/if-you-have-meeting-ethiopia-you-better-double-check-time
# Gabon
# See Africa/Lagos.

2
antarctica
View File

@ -1,3 +1,5 @@
# tzdb data for Antarctica and environs
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.

314
asia
View File

@ -1,3 +1,5 @@
# tzdb data for Asia and environs
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.
@ -6,7 +8,7 @@
# tz@iana.org for general use in the future). For more, please see
# the file CONTRIBUTING in the tz distribution.
# From Paul Eggert (2017-01-13):
# From Paul Eggert (2018-06-19):
#
# Unless otherwise specified, the source for data through 1990 is:
# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
@ -35,7 +37,8 @@
# A reliable and entertaining source about time zones is
# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
#
# The following alphabetic abbreviations appear in these tables:
# The following alphabetic abbreviations appear in these tables
# (corrections are welcome):
# std dst
# LMT Local Mean Time
# 2:00 EET EEST Eastern European Time
@ -44,11 +47,13 @@
# 7:00 WIB west Indonesia (Waktu Indonesia Barat)
# 8:00 WITA central Indonesia (Waktu Indonesia Tengah)
# 8:00 CST China
# 8:00 PST PDT* Philippine Standard Time
# 8:30 KST KDT Korea when at +0830
# 9:00 WIT east Indonesia (Waktu Indonesia Timur)
# 9:00 JST JDT Japan
# 9:00 KST KDT Korea when at +09
# 9:30 ACST Australian Central Standard Time
# *I invented the abbreviation PDT; see "Philippines" below.
# Otherwise, these tables typically use numeric abbreviations like +03
# and +0330 for integer hour and minute UT offsets. Although earlier
# editions invented alphabetic time zone abbreviations for every
@ -281,6 +286,29 @@ Zone Asia/Yangon 6:24:47 - LMT 1880 # or Rangoon
# China
# From Paul Eggert (2018-10-02):
# The following comes from Table 1 of:
# Li Yu. Research on the daylight saving movement in 1940s Shanghai.
# Nanjing Journal of Social Sciences. 2014;(2):144-50.
# http://oversea.cnki.net/kns55/detail.aspx?dbname=CJFD2014&filename=NJSH201402020
# 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.
#
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Shang 1940 only - Jun 1 0:00 1:00 D
Rule Shang 1940 only - Oct 12 24:00 0 S
Rule Shang 1941 only - Mar 15 0:00 1:00 D
Rule Shang 1941 only - Nov 1 24:00 0 S
Rule Shang 1942 only - Jan 31 0:00 1:00 D
Rule Shang 1945 only - Sep 1 24:00 0 S
Rule Shang 1946 only - May 15 0:00 1:00 D
Rule Shang 1946 only - Sep 30 24:00 0 S
Rule Shang 1947 only - Apr 15 0:00 1:00 D
Rule Shang 1947 only - Oct 31 24:00 0 S
Rule Shang 1948 1949 - May 1 0:00 1:00 D
Rule Shang 1948 1949 - Sep 30 24:00 0 S #plan
# From Guy Harris:
# People's Republic of China. Yes, they really have only one time zone.
@ -307,18 +335,33 @@ Zone Asia/Yangon 6:24:47 - LMT 1880 # or Rangoon
# time - sort of", Los Angeles Times, 1986-05-05 ... [says] that China began
# observing daylight saving time in 1986.
# From Paul Eggert (2014-06-30):
# Shanks & Pottenger have China switching to a single time zone in 1980, but
# this doesn't seem to be correct. They also write that China observed summer
# DST from 1986 through 1991, which seems to match the above commentary, so
# go with them for DST rules as follows:
# From P Chan (2018-05-07):
# The start and end time of DST in China [from 1986 on] should be 2:00
# (i.e. 2:00 to 3:00 at the start and 2:00 to 1:00 at the end)....
# Government notices about summer time:
#
# 1986-04-12 http://www.zj.gov.cn/attach/zfgb/198608.pdf p.21-22
# (To establish summer time from 1986. On 4 May, set the clocks ahead one hour
# at 2 am. On 14 September, set the clocks backward one hour at 2 am.)
#
# 1987-02-15 http://www.gov.cn/gongbao/shuju/1987/gwyb198703.pdf p.114
# (Summer time in 1987 to start from 12 April until 13 September)
#
# 1987-09-09 http://www.gov.cn/gongbao/shuju/1987/gwyb198721.pdf p.709
# (From 1988, summer time to start from 2 am of the first Sunday of mid-April
# until 2 am of the first Sunday of mid-September)
#
# 1992-03-03 http://www.gov.cn/gongbao/shuju/1992/gwyb199205.pdf p.152
# (To suspend summer time from 1992)
#
# The first page of People's Daily on 12 April 1988 stating that summer time
# to begin on 17 April.
# http://data.people.com.cn/pic/101p/1988/04/1988041201.jpg
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Shang 1940 only - Jun 3 0:00 1:00 D
Rule Shang 1940 1941 - Oct 1 0:00 0 S
Rule Shang 1941 only - Mar 16 0:00 1:00 D
Rule PRC 1986 only - May 4 0:00 1:00 D
Rule PRC 1986 1991 - Sep Sun>=11 0:00 0 S
Rule PRC 1987 1991 - Apr Sun>=10 0:00 1:00 D
Rule PRC 1986 only - May 4 2:00 1:00 D
Rule PRC 1986 1991 - Sep Sun>=11 2:00 0 S
Rule PRC 1987 1991 - Apr Sun>=11 2:00 1:00 D
# From Anthony Fok (2001-12-20):
# BTW, I did some research on-line and found some info regarding these five
@ -340,10 +383,11 @@ Rule PRC 1987 1991 - Apr Sun>=10 0:00 1:00 D
# Alois Treindl kindly sent me translations of the following two sources:
#
# (1)
# Guo Qingsheng (National Time-Service Center, CAS, Xi'an 710600, China)
# Guo Qing-sheng (National Time-Service Center, CAS, Xi'an 710600, China)
# Beijing Time at the Beginning of the PRC
# China Historical Materials of Science and Technology
# (Zhongguo ke ji shi liao, 中国科技史料), Vol. 24, No. 1 (2003)
# (Zhongguo ke ji shi liao, 中国科技史料). 2003;24(1):5-9.
# http://oversea.cnki.net/kcms/detail/detail.aspx?filename=ZGKS200301000&dbname=CJFD2003
# It gives evidence that at the beginning of the PRC, Beijing time was
# officially apparent solar time! However, Guo also says that the
# evidence is dubious, as the relevant institute of astronomy had not
@ -520,7 +564,7 @@ Rule PRC 1987 1991 - Apr Sun>=10 0:00 1:00 D
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
# Beijing time, used throughout China; represented by Shanghai.
Zone Asia/Shanghai 8:05:43 - LMT 1901
8:00 Shang C%sT 1949
8:00 Shang C%sT 1949 May 28
8:00 PRC C%sT
# Xinjiang time, used by many in western China; represented by Ürümqi / Ürümchi
# / Wulumuqi. (Please use Asia/Shanghai if you prefer Beijing time.)
@ -749,24 +793,140 @@ Zone Asia/Taipei 8:06:00 - LMT 1896 Jan 1
8:00 Taiwan C%sT
# Macau (Macao, Aomen)
#
# From P Chan (2018-05-10):
# * LegisMac
# http://legismac.safp.gov.mo/legismac/descqry/Descqry.jsf?lang=pt
# A database for searching titles of legal documents of Macau in
# Chinese and Portuguese. The term "HORÁRIO DE VERÃO" can be used for
# searching decrees about summer time.
# * Archives of Macao
# http://www.archives.gov.mo/en/bo/
# It contains images of old official gazettes.
# * The Macao Meteorological and Geophysical Bureau have a page listing the
# summer time history. But it is not complete and has some mistakes.
# http://www.smg.gov.mo/smg/geophysics/e_t_Summer%20Time.htm
# Macau adopted GMT+8 on 30 Oct 1904 to follow Hong Kong. Clocks were
# advanced by 25 minutes and 50 seconds. Which means the LMT used was
# +7:34:10. As stated in the "Portaria No. 204" dated 21 October 1904
# and published in the Official Gazette on 29 October 1904.
# http://igallery.icm.gov.mo/Images/Archives/BO/MO_AH_PUB_BO_1904_10/MO_AH_PUB_BO_1904_10_00025_Grey.JPG
#
# Therefore the 1911 decree of Portugal did not change time in Macau.
#
# From LegisMac, here is a list of decrees that changed the time ...
# [Decree Gazette-no. date; titles omitted in this quotation]
# DIL 732 BOCM 51 1941.12.20
# DIL 764 BOCM 9S 1942.04.30
# DIL 781 BOCM 21 1942.10.10
# PT 3434 BOCM 8S 1943.04.17
# PT 3504 BOCM 20 1943.09.25
# PT 3843 BOCM 39 1945.09.29
# PT 3961 BOCM 17 1946.04.27
# PT 4026 BOCM 39 1946.09.28
# PT 4153 BOCM 16 1947.04.10
# PT 4271 BOCM 48 1947.11.29
# PT 4374 BOCM 18 1948.05.01
# PT 4465 BOCM 44 1948.10.30
# PT 4590 BOCM 14 1949.04.02
# PT 4666 BOCM 44 1949.10.29
# PT 4771 BOCM 12 1950.03.25
# PT 4838 BOCM 43 1950.10.28
# PT 4946 BOCM 12 1951.03.24
# PT 5025 BO 43 1951.10.27
# PT 5149 BO 14 1952.04.05
# PT 5251 BO 43 1952.10.25
# PT 5366 BO 13 1953.03.28
# PT 5444 BO 44 1953.10.31
# PT 5540 BO 12 1954.03.20
# PT 5589 BO 44 1954.10.30
# PT 5676 BO 12 1955.03.19
# PT 5739 BO 45 1955.11.05
# PT 5823 BO 11 1956.03.17
# PT 5891 BO 44 1956.11.03
# PT 5981 BO 12 1957.03.23
# PT 6064 BO 43 1957.10.26
# PT 6172 BO 12 1958.03.22
# PT 6243 BO 43 1958.10.25
# PT 6341 BO 12 1959.03.21
# PT 6411 BO 43 1959.10.24
# PT 6514 BO 11 1960.03.12
# PT 6584 BO 44 1960.10.29
# PT 6721 BO 10 1961.03.11
# PT 6815 BO 43 1961.10.28
# PT 6947 BO 10 1962.03.10
# PT 7080 BO 43 1962.10.27
# PT 7218 BO 12 1963.03.23
# PT 7340 BO 43 1963.10.26
# PT 7491 BO 11 1964.03.14
# PT 7664 BO 43 1964.10.24
# PT 7846 BO 15 1965.04.10
# PT 7979 BO 42 1965.10.16
# PT 8146 BO 15 1966.04.09
# PT 8252 BO 41 1966.10.08
# PT 8429 BO 15 1967.04.15
# PT 8540 BO 41 1967.10.14
# PT 8735 BO 15 1968.04.13
# PT 8860 BO 41 1968.10.12
# PT 9035 BO 16 1969.04.19
# PT 9156 BO 42 1969.10.18
# PT 9328 BO 15 1970.04.11
# PT 9418 BO 41 1970.10.10
# PT 9587 BO 14 1971.04.03
# PT 9702 BO 41 1971.10.09
# PT 38-A/72 BO 14 1972.04.01
# PT 126-A/72 BO 41 1972.10.07
# PT 61/73 BO 14 1973.04.07
# PT 182/73 BO 40 1973.10.06
# PT 282/73 BO 51 1973.12.22
# PT 177/74 BO 41 1974.10.12
# PT 51/75 BO 15 1975.04.12
# PT 173/75 BO 41 1975.10.11
# PT 67/76/M BO 14 1976.04.03
# PT 169/76/M BO 41 1976.10.09
# PT 78/79/M BO 19 1979.05.12
# PT 166/79/M BO 42 1979.10.20
# Note that DIL 732 does not belong to "HORÁRIO DE VERÃO" according to
# LegisMac.... Note that between 1942 and 1945, the time switched
# between GMT+9 and GMT+10. Also in 1965 and 1965 the DST ended at 2:30am.
# From Paul Eggert (2018-05-10):
# The 1904 decree says that Macau changed from the meridian of
# Fortaleza do Monte, presumably the basis for the 7:34:10 for LMT.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Macau 1961 1962 - Mar Sun>=16 3:30 1:00 D
Rule Macau 1961 1964 - Nov Sun>=1 3:30 0 S
Rule Macau 1963 only - Mar Sun>=16 0:00 1:00 D
Rule Macau 1964 only - Mar Sun>=16 3:30 1:00 D
Rule Macau 1965 only - Mar Sun>=16 0:00 1:00 D
Rule Macau 1965 only - Oct 31 0:00 0 S
Rule Macau 1966 1971 - Apr Sun>=16 3:30 1:00 D
Rule Macau 1966 1971 - Oct Sun>=16 3:30 0 S
Rule Macau 1972 1974 - Apr Sun>=15 0:00 1:00 D
Rule Macau 1972 1973 - Oct Sun>=15 0:00 0 S
Rule Macau 1974 1977 - Oct Sun>=15 3:30 0 S
Rule Macau 1975 1977 - Apr Sun>=15 3:30 1:00 D
Rule Macau 1978 1980 - Apr Sun>=15 0:00 1:00 D
Rule Macau 1978 1980 - Oct Sun>=15 0:00 0 S
# See Europe/Lisbon for info about the 1912 transition.
Rule Macau 1942 1943 - Apr 30 23:00 1:00 -
Rule Macau 1942 only - Nov 17 23:00 0 -
Rule Macau 1943 only - Sep 30 23:00 0 S
Rule Macau 1946 only - Apr 30 23:00s 1:00 D
Rule Macau 1946 only - Sep 30 23:00s 0 S
Rule Macau 1947 only - Apr 19 23:00s 1:00 D
Rule Macau 1947 only - Nov 30 23:00s 0 S
Rule Macau 1948 only - May 2 23:00s 1:00 D
Rule Macau 1948 only - Oct 31 23:00s 0 S
Rule Macau 1949 1950 - Apr Sat>=1 23:00s 1:00 D
Rule Macau 1949 1950 - Oct lastSat 23:00s 0 S
Rule Macau 1951 only - Mar 31 23:00s 1:00 D
Rule Macau 1951 only - Oct 28 23:00s 0 S
Rule Macau 1952 1953 - Apr Sat>=1 23:00s 1:00 D
Rule Macau 1952 only - Nov 1 23:00s 0 S
Rule Macau 1953 1954 - Oct lastSat 23:00s 0 S
Rule Macau 1954 1956 - Mar Sat>=17 23:00s 1:00 D
Rule Macau 1955 only - Nov 5 23:00s 0 S
Rule Macau 1956 1964 - Nov Sun>=1 03:30 0 S
Rule Macau 1957 1964 - Mar Sun>=18 03:30 1:00 D
Rule Macau 1965 1973 - Apr Sun>=16 03:30 1:00 D
Rule Macau 1965 1966 - Oct Sun>=16 02:30 0 S
Rule Macau 1967 1976 - Oct Sun>=16 03:30 0 S
Rule Macau 1973 only - Dec 30 03:30 1:00 D
Rule Macau 1975 1976 - Apr Sun>=16 03:30 1:00 D
Rule Macau 1979 only - May 13 03:30 1:00 D
Rule Macau 1979 only - Oct Sun>=16 03:30 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Asia/Macau 7:34:20 - LMT 1911 Dec 31 16:00u
Zone Asia/Macau 7:34:10 - LMT 1904 Oct 30
8:00 - CST 1941 Dec 21 23:00
9:00 Macau +09/+10 1945 Sep 30 24:00
8:00 Macau C%sT
@ -1471,9 +1631,29 @@ Zone Asia/Jerusalem 2:20:54 - LMT 1880
# http://www.shugiin.go.jp/internet/itdb_housei.nsf/html/houritsu/00719500331039.htm
# ... In summary, it is written as follows. From 24:00 on the first Saturday
# in May, until 0:00 on the day after the second Saturday in September.
# From Phake Nick (2018-09-27):
# [T]he webpage authored by National Astronomical Observatory of Japan
# https://eco.mtk.nao.ac.jp/koyomi/wiki/BBFEB9EF2FB2C6BBFEB9EF.html
# ... mentioned that using Showa 23 (year 1948) as example, 13pm of September
# 11 in summer time will equal to 0am of September 12 in standard time.
# It cited a document issued by the Liaison Office which briefly existed
# during the postwar period of Japan, where the detail on implementation
# of the summer time is described in the document.
# https://eco.mtk.nao.ac.jp/koyomi/wiki/BBFEB9EF2FB2C6BBFEB9EFB2C6BBFEB9EFA4CEBCC2BBDCA4CBA4C4A4A4A4C6.pdf
# The text in the document do instruct a fall back to occur at
# September 11, 13pm in summer time, while ordinary citizens can
# change the clock before they sleep.
#
# From Paul Eggert (2018-09-27):
# This instruction is equivalent to "Sat>=8 25:00", so use that. zic treats
# it like "Sun>=9 01:00", which is not quite the same but is the best we can
# do in any POSIX or C platform. The "25:00" assumes zic from 2007 or later,
# which should be safe now.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Japan 1948 only - May Sat>=1 24:00 1:00 D
Rule Japan 1948 1951 - Sep Sun>=9 0:00 0 S
Rule Japan 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
@ -1855,7 +2035,7 @@ Zone Asia/Aqtobe 3:48:40 - LMT 1924 May 2
5:00 - +05
# Mangghystaū (KZ-MAN)
# Aqtau was not founded until 1963, but it represents an inhabited region,
# so include time stamps before 1963.
# so include timestamps before 1963.
Zone Asia/Aqtau 3:21:04 - LMT 1924 May 2
4:00 - +04 1930 Jun 21
5:00 - +05 1981 Oct 1
@ -1995,6 +2175,10 @@ Rule ROK 1987 1988 - Oct Sun>=8 3:00 0 S
# Assembly, as published in Rodong Sinmun.
# From Tim Parenti (2018-04-29):
# It appears to be the front page story at the top in the right-most column.
#
# From Paul Eggert (2018-05-04):
# The BBC reported that the transition was from 23:30 to 24:00 today.
# https://www.bbc.com/news/world-asia-44010705
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Asia/Seoul 8:27:52 - LMT 1908 Apr 1
@ -2007,7 +2191,7 @@ Zone Asia/Pyongyang 8:23:00 - LMT 1908 Apr 1
8:30 - KST 1912 Jan 1
9:00 - JST 1945 Aug 24
9:00 - KST 2015 Aug 15 00:00
8:30 - KST 2018 May 5
8:30 - KST 2018 May 4 23:30
9:00 - KST
###############################################################################
@ -2757,19 +2941,35 @@ Zone Asia/Hebron 2:20:23 - LMT 1900 Oct
# Philippine Star 2014-08-05
# http://www.philstar.com/headlines/2014/08/05/1354152/pnoy-urged-declare-use-daylight-saving-time
# From Paul Goyette (2018-06-15):
# In the Philippines, there is a national law, Republic Act No. 10535
# which declares the official time here as "Philippine Standard Time".
# The act [1] even specifies use of PST as the abbreviation, although
# the FAQ provided by PAGASA [2] uses the "acronym PhST to distinguish
# it from the Pacific Standard Time (PST)."
# [1] http://www.officialgazette.gov.ph/2013/05/15/republic-act-no-10535/
# [2] https://www1.pagasa.dost.gov.ph/index.php/astronomy/philippine-standard-time#republic-act-10535
#
# From Paul Eggert (2018-06-19):
# I surveyed recent news reports, and my impression is that "PST" is
# more popular among reliable English-language news sources. This is
# not just a measure of Google hit counts: it's also the sizes and
# influence of the sources. There is no current abbreviation for DST,
# so use "PDT", the usual American style.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Phil 1936 only - Nov 1 0:00 1:00 -
Rule Phil 1937 only - Feb 1 0:00 0 -
Rule Phil 1954 only - Apr 12 0:00 1:00 -
Rule Phil 1954 only - Jul 1 0:00 0 -
Rule Phil 1978 only - Mar 22 0:00 1:00 -
Rule Phil 1978 only - Sep 21 0:00 0 -
Rule Phil 1936 only - Nov 1 0:00 1:00 D
Rule Phil 1937 only - Feb 1 0:00 0 S
Rule Phil 1954 only - Apr 12 0:00 1:00 D
Rule Phil 1954 only - Jul 1 0:00 0 S
Rule Phil 1978 only - Mar 22 0:00 1:00 D
Rule Phil 1978 only - Sep 21 0:00 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Asia/Manila -15:56:00 - LMT 1844 Dec 31
8:04:00 - LMT 1899 May 11
8:00 Phil +08/+09 1942 May
9:00 - +09 1944 Nov
8:00 Phil +08/+09
8:00 Phil P%sT 1942 May
9:00 - JST 1944 Nov
8:00 Phil P%sT
# Qatar
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
@ -2780,15 +2980,34 @@ Link Asia/Qatar Asia/Bahrain
# Saudi Arabia
#
# From Paul Eggert (2014-07-15):
# From Paul Eggert (2018-08-29):
# Time in Saudi Arabia and other countries in the Arabian peninsula was not
# standardized until relatively recently; we don't know when, and possibly it
# standardized until 1968 or so; we don't know exactly when, and possibly it
# has never been made official. Richard P Hunt, in "Islam city yielding to
# modern times", New York Times (1961-04-09), p 20, wrote that only airlines
# observed standard time, and that people in Jeddah mostly observed quasi-solar
# time, doing so by setting their watches at sunrise to 6 o'clock (or to 12
# o'clock for "Arab" time).
#
# Timekeeping differed depending on who you were and which part of Saudi
# Arabia you were in. In 1969, Elias Antar wrote that although a common
# practice had been to set one's watch to 12:00 (i.e., midnight) at sunset -
# which meant that the time on one side of a mountain could differ greatly from
# the time on the other side - many foreigners set their watches to 6pm
# instead, while airlines instead used UTC +03 (except in Dhahran, where they
# used UTC +04), Aramco used UTC +03 with DST, and the Trans-Arabian Pipe Line
# Company used Aramco time in eastern Saudi Arabia and airline time in western.
# (The American Military Aid Advisory Group used plain UTC.) Antar writes,
# "A man named Higgins, so the story goes, used to run a local power
# station. One day, the whole thing became too much for Higgins and he
# assembled his staff and laid down the law. 'I've had enough of this,' he
# shrieked. 'It is now 12 o'clock Higgins Time, and from now on this station is
# going to run on Higgins Time.' And so, until last year, it did." See:
# Antar E. Dinner at When? Saudi Aramco World, 1969 March/April. 2-3.
# http://archive.aramcoworld.com/issue/196902/dinner.at.when.htm
# newspapers.com says a similar story about Higgins was published in the Port
# Angeles (WA) Evening News, 1965-03-10, page 5, but I lack access to the text.
#
# The TZ database cannot represent quasi-solar time; airline time is the best
# we can do. The 1946 foreign air news digest of the U.S. Civil Aeronautics
# Board (OCLC 42299995) reported that the "... Arabian Government, inaugurated
@ -2798,7 +3017,8 @@ Link Asia/Qatar Asia/Bahrain
#
# Shanks & Pottenger also state that until 1968-05-01 Saudi Arabia had two
# time zones; the other zone, at UT +04, was in the far eastern part of
# the country. Ignore this, as it's before our 1970 cutoff.
# the country. Presumably this is documenting airline time. Ignore this,
# as it's before our 1970 cutoff.
#
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Asia/Riyadh 3:06:52 - LMT 1947 Mar 14

13
australasia
View File

@ -1,3 +1,5 @@
# tzdb data for Australasia and environs, and for much of the Pacific
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.
@ -361,8 +363,15 @@ Zone Indian/Cocos 6:27:40 - LMT 1900
# Dominic Fok writes (2017-08-20) that DST ends 2018-01-14, citing
# Extraordinary Government of Fiji Gazette Supplement No. 21 (2017-08-27),
# [Legal Notice No. 41] of an order of the previous day by J Usamate.
# From Raymond Kumar (2018-07-13):
# http://www.fijitimes.com/government-approves-2018-daylight-saving/
# ... The daylight saving period will end at 3am on Sunday January 13, 2019.
#
# From Paul Eggert (2018-07-15):
# For now, guess DST from 02:00 the first Sunday in November to 03:00
# the first Sunday on or after January 14. Although ad hoc, it matches
# the first Sunday on or after January 13. January transitions reportedly
# depend on when school terms start. Although the guess is ad hoc, it matches
# transitions since late 2014 and seems more likely to match future
# practice than guessing no DST.
@ -376,7 +385,7 @@ Rule Fiji 2011 only - Mar Sun>=1 3:00 0 -
Rule Fiji 2012 2013 - Jan Sun>=18 3:00 0 -
Rule Fiji 2014 only - Jan Sun>=18 2:00 0 -
Rule Fiji 2014 max - Nov Sun>=1 2:00 1:00 -
Rule Fiji 2015 max - Jan Sun>=14 3:00 0 -
Rule Fiji 2015 max - Jan Sun>=13 3:00 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Pacific/Fiji 11:55:44 - LMT 1915 Oct 26 # Suva
12:00 Fiji +12/+13

4
backward
View File

@ -1,7 +1,9 @@
# tzdb links for backward compatibility
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.
# This file provides links between current names for time zones
# This file provides links between current names for timezones
# and their old names. Many names changed in late 1993.
# Link TARGET LINK-NAME

4
backzone
View File

@ -16,13 +16,13 @@
# the file 'backward'.
# Although zones in this file may be of some use for analyzing
# pre-1970 time stamps, they are less reliable, cover only a tiny
# pre-1970 timestamps, they are less reliable, cover only a tiny
# sliver of the pre-1970 era, and cannot feasibly be improved to cover
# most of the era. Because the zones are out of normal scope for the
# database, less effort is put into maintaining this file. Many of
# the zones were formerly in other source files, but were removed or
# replaced by links as their data entries were questionable and/or they
# differed from other zones only in pre-1970 time stamps.
# differed from other zones only in pre-1970 timestamps.
# Unless otherwise specified, the source for data through 1990 is:
# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),

4
etcetera
View File

@ -1,9 +1,11 @@
# tzdb data for ships at sea and other miscellany
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.
# These entries are mostly present for historical reasons, so that
# people in areas not otherwise covered by the tz files could "zic -l"
# to a time zone that was right for their area. These days, the
# to a timezone that was right for their area. These days, the
# tz files cover almost all the inhabited world, and the only practical
# need now for the entries that are not on UTC are for ships at sea
# that cannot use POSIX TZ settings.

74
europe
View File

@ -1,3 +1,5 @@
# tzdb data for Europe and environs
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.
@ -517,7 +519,7 @@ Link Europe/London Europe/Isle_of_Man
#
# To work around this problem, the build procedure can translate the
# following data into two forms, one with negative SAVE values and the
# other form with a traditional approximation for Irish time stamps
# other form with a traditional approximation for Irish timestamps
# after 1971-10-31 02:00 UTC; although this approximation has tm_isdst
# flags that are reversed, its UTC offsets are correct and this often
# suffices. This source file currently uses only nonnegative SAVE
@ -2427,6 +2429,33 @@ Zone Europe/Bucharest 1:44:24 - LMT 1891 Oct
# administratively part of Sakhalin oblast', they appear to have
# remained on UTC+11 along with Magadan.
# From Marat Nigametzianov (2018-07-16):
# this is link to order from 1956 about timezone in USSR
# http://astro.uni-altai.ru/~orion/blog/2011/11/novyie-granitsyi-chasovyih-poyasov-v-sssr/
#
# From Paul Eggert (2018-07-16):
# Perhaps someone could translate the above-mentioned link and use it
# to correct our data for the ex-Soviet Union. It cites the following:
# «Поясное время и новые границы часовых поясов» / сост. П.Н. Долгов,
# отв. ред. Г.Д. Бурдун - М: Комитет стандартов, мер и измерительных
# приборов при Совете Министров СССР, Междуведомственная комиссия
# единой службы времени, 1956 г.
# This book looks like it would be a helpful resource for the Soviet
# Union through 1956. Although a copy was in the Scientific Library
# of Tomsk State University, I have not been able to track down a copy nearby.
#
# From Stepan Golosunov (2018-07-21):
# http://astro.uni-altai.ru/~orion/blog/2015/05/center-reforma-ischisleniya-vremeni-br-na-territorii-sssr-v-1957-godu-center/
# says that the 1956 decision to change time belts' borders was not
# implemented as planned in 1956 and the change happened in 1957.
# There is also the problem that actual time zones were different from
# the official time belts (and from many time belts' maps) as there were
# numerous exceptions to application of time belt rules. For example,
# https://ru.wikipedia.org/wiki/Московское_время#Перемещение_границы_применения_московского_времени_на_восток
# says that by 1962 there were many regions in the 3rd time belt that
# were on Moscow time, referring to a 1962 map. By 1989 number of such
# exceptions grew considerably.
# From Tim Parenti (2014-07-06):
# The comments detailing the coverage of each Russian zone are meant to assist
# with maintenance only and represent our best guesses as to which regions
@ -2437,9 +2466,6 @@ Zone Europe/Bucharest 1:44:24 - LMT 1891 Oct
# future stability. ISO 3166-2:RU codes are also listed for first-level
# divisions where available.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
# From Tim Parenti (2014-07-03):
# Europe/Kaliningrad covers...
# 39 RU-KGD Kaliningrad Oblast
@ -2707,6 +2733,15 @@ Zone Europe/Astrakhan 3:12:12 - LMT 1924 May
# 34 RU-VGG Volgograd Oblast
# The 1988 transition is from USSR act No. 5 (1988-01-04).
# From Alexander Fetisov (2018-09-20):
# Volgograd region in southern Russia (Europe/Volgograd) change
# timezone from UTC+3 to UTC+4 from 28oct2018.
# http://sozd.parliament.gov.ru/bill/452878-7
#
# From Stepan Golosunov (2018-10-11):
# The law has been published today on
# http://publication.pravo.gov.ru/Document/View/0001201810110037
Zone Europe/Volgograd 2:57:40 - LMT 1920 Jan 3
3:00 - +03 1930 Jun 21
4:00 - +04 1961 Nov 11
@ -2715,7 +2750,8 @@ Zone Europe/Volgograd 2:57:40 - LMT 1920 Jan 3
4:00 - +04 1992 Mar 29 2:00s
3:00 Russia +03/+04 2011 Mar 27 2:00s
4:00 - +04 2014 Oct 26 2:00s
3:00 - +03
3:00 - +03 2018 Oct 28 2:00s
4:00 - +04
# From Paul Eggert (2016-11-11):
# Europe/Saratov covers:
@ -3424,6 +3460,7 @@ Zone Africa/Ceuta -0:21:16 - LMT 1900 Dec 31 23:38:44
0:00 1:00 WEST 1918 Oct 7 23:00
0:00 - WET 1924
0:00 Spain WE%sT 1929
0:00 - WET 1967 # Help zishrink.awk.
0:00 SpainAfrica WE%sT 1984 Mar 16
1:00 - CET 1986
1:00 EU CE%sT
@ -3609,7 +3646,7 @@ Zone Europe/Zurich 0:34:08 - LMT 1853 Jul 16 # See above comment.
# http://www.resmigazete.gov.tr/eskiler/2001/03/20010324.htm#2 - for 2001
# http://www.resmigazete.gov.tr/eskiler/2002/03/20020316.htm#2 - for 2002-2006
# From Paul Eggert (2016-09-25):
# Prefer the above sources to Shanks & Pottenger for time stamps after 1985.
# Prefer the above sources to Shanks & Pottenger for timestamps after 1985.
# From Steffen Thorsen (2007-03-09):
# Starting 2007 though, it seems that they are adopting EU's 1:00 UTC
@ -3819,10 +3856,29 @@ Link Europe/Istanbul Asia/Istanbul # Istanbul is in both continents.
# * Ukrainian Government's Resolution of 20.03.1992, No. 139.
# http://www.uazakon.com/documents/date_8u/pg_grcasa.htm
# From Paul Eggert (2018-10-03):
# As is usual in tzdb, Ukrainian zones use the most common English spellings.
# For example, tzdb uses Europe/Kiev, as "Kiev" is the most common spelling in
# English for Ukraine's capital, even though it is certainly wrong as a
# transliteration of the Ukrainian "Київ". This is similar to tzdb's use of
# Europe/Prague, which is certainly wrong as a transliteration of the Czech
# "Praha". ("Kiev" came from old Slavic via Russian to English, and "Prague"
# came from old Slavic via French to English, so the two cases have something
# in common.) Admittedly English-language spelling of Ukrainian names is
# controversial, and some day "Kyiv" may become substantially more popular in
# English; in the meantime, stick with the traditional English "Kiev" as that
# means less disruption for our users.
#
# Anyway, none of the common English-language spellings (Kiev, Kyiv, Kieff,
# Kijeff, Kijev, Kiyef, Kiyeff) do justice to the common pronunciation in
# Ukrainian, namely [ˈkɪjiu̯] (IPA). This pronunciation has nothing like an
# English "v" or "f", and instead trails off with what an English-speaker
# would call a demure "oo" sound, and it would would be better anglicized as
# "Kuiyu". Here's a sound file, if you would like to do as the Kuiyuvians do:
# https://commons.wikimedia.org/wiki/File:Uk-Київ.ogg
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
# Most of Ukraine since 1970 has been like Kiev.
# "Kyiv" is the transliteration of the Ukrainian name, but
# "Kiev" is more common in English.
# This represents most of Ukraine. See above for the spelling of "Kiev".
Zone Europe/Kiev 2:02:04 - LMT 1880
2:02:04 - KMT 1924 May 2 # Kiev Mean Time
2:00 - EET 1930 Jun 21

6
factory
View File

@ -1,8 +1,10 @@
# tzdb data for noncommittal factory settings
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.
# For distributors who don't want to put time zone specification in
# their installation procedures. Users that run 'date' will get the
# For distributors who don't want to specify a timezone in their
# installation procedures. Users who run 'date' will get the
# time zone abbreviation "-00", indicating that the actual time zone
# is unknown.

8
leap-seconds.list
View File

@ -204,10 +204,10 @@
# current -- the update time stamp, the data and the name of the file
# will not change.
#
# Updated through IERS Bulletin C55
# File expires on: 28 December 2018
# Updated through IERS Bulletin C56
# File expires on: 28 June 2019
#
#@ 3754944000
#@ 3770668800
#
2272060800 10 # 1 Jan 1972
2287785600 11 # 1 Jul 1972
@ -252,4 +252,4 @@
# the hash line is also ignored in the
# computation.
#
#h 44dcf58c e28d25aa b36612c8 f3d3e8b5 a8fdf478
#h 62ca19f6 96a4ae0a 3708451c 9f8693f4 016604eb

31
leapseconds
View File

@ -3,21 +3,25 @@
# This file is in the public domain.
# This file is generated automatically from the data in the public-domain
# leap-seconds.list file, which is copied from:
# ftp://ftp.nist.gov/pub/time/leap-seconds.list
# leap-seconds.list file, which can be copied from
# <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
# or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>
# or <ftp://tycho.usno.navy.mil/pub/ntp/leap-seconds.list>.
# For more about leap-seconds.list, please see
# The NTP Timescale and Leap Seconds
# https://www.eecis.udel.edu/~mills/leap.html
# <https://www.eecis.udel.edu/~mills/leap.html>.
# The International Earth Rotation and Reference Systems Service
# periodically uses leap seconds to keep UTC to within 0.9 s of UT1
# (which measures the true angular orientation of the earth in space); see
# Levine J. Coordinated Universal Time and the leap second.
# (which measures the true angular orientation of the earth in space)
# and publishes leap second data in a copyrighted file
# <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>.
# See: Levine J. Coordinated Universal Time and the leap second.
# URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995
# http://ieeexplore.ieee.org/document/7909995/
# <https://ieeexplore.ieee.org/document/7909995>.
# There were no leap seconds before 1972, because the official mechanism
# accounting for the discrepancy between atomic time and the earth's rotation
# did not exist until the early 1970s.
# did not exist.
# The correction (+ or -) is made at the given time, so lines
# will typically look like:
@ -25,10 +29,7 @@
# or
# Leap YEAR MON DAY 23:59:59 - R/S
# If the leapsecond is Rolling (R) the given time is local time.
# If the leapsecond is Stationary (S) the given time is UTC.
# Leap YEAR MONTH DAY HH:MM:SS CORR R/S
# If the leap second is Rolling (R) the given time is local time (unused here).
Leap 1972 Jun 30 23:59:60 + S
Leap 1972 Dec 31 23:59:60 + S
Leap 1973 Dec 31 23:59:60 + S
@ -57,5 +58,9 @@ Leap 2012 Jun 30 23:59:60 + S
Leap 2015 Jun 30 23:59:60 + S
Leap 2016 Dec 31 23:59:60 + S
# Updated through IERS Bulletin C55
# File expires on: 28 December 2018
# POSIX timestamps for the data in this file:
#updated 1467936000
#expires 1561680000
# Updated through IERS Bulletin C56
# File expires on: 28 June 2019

68
leapseconds.awk
View File

@ -8,21 +8,25 @@ BEGIN {
print "# This file is in the public domain."
print ""
print "# This file is generated automatically from the data in the public-domain"
print "# leap-seconds.list file, which is copied from:"
print "# ftp://ftp.nist.gov/pub/time/leap-seconds.list"
print "# leap-seconds.list file, which can be copied from"
print "# <ftp://ftp.nist.gov/pub/time/leap-seconds.list>"
print "# or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>"
print "# or <ftp://tycho.usno.navy.mil/pub/ntp/leap-seconds.list>."
print "# For more about leap-seconds.list, please see"
print "# The NTP Timescale and Leap Seconds"
print "# https://www.eecis.udel.edu/~mills/leap.html"
print "# <https://www.eecis.udel.edu/~mills/leap.html>."
print ""
print "# The International Earth Rotation and Reference Systems Service"
print "# periodically uses leap seconds to keep UTC to within 0.9 s of UT1"
print "# (which measures the true angular orientation of the earth in space); see"
print "# Levine J. Coordinated Universal Time and the leap second."
print "# (which measures the true angular orientation of the earth in space)"
print "# and publishes leap second data in a copyrighted file"
print "# <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>."
print "# See: Levine J. Coordinated Universal Time and the leap second."
print "# URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995"
print "# http://ieeexplore.ieee.org/document/7909995/"
print "# <https://ieeexplore.ieee.org/document/7909995>."
print "# There were no leap seconds before 1972, because the official mechanism"
print "# accounting for the discrepancy between atomic time and the earth's rotation"
print "# did not exist until the early 1970s."
print "# did not exist."
print ""
print "# The correction (+ or -) is made at the given time, so lines"
print "# will typically look like:"
@ -30,18 +34,35 @@ BEGIN {
print "# or"
print "# Leap YEAR MON DAY 23:59:59 - R/S"
print ""
print "# If the leapsecond is Rolling (R) the given time is local time."
print "# If the leapsecond is Stationary (S) the given time is UTC."
print ""
print "# Leap YEAR MONTH DAY HH:MM:SS CORR R/S"
}
print "# If the leap second is Rolling (R) the given time is local time (unused here)."
/^ *$/ { next }
monthabbr[ 1] = "Jan"
monthabbr[ 2] = "Feb"
monthabbr[ 3] = "Mar"
monthabbr[ 4] = "Apr"
monthabbr[ 5] = "May"
monthabbr[ 6] = "Jun"
monthabbr[ 7] = "Jul"
monthabbr[ 8] = "Aug"
monthabbr[ 9] = "Sep"
monthabbr[10] = "Oct"
monthabbr[11] = "Nov"
monthabbr[12] = "Dec"
for (i in monthabbr) {
monthnum[monthabbr[i]] = i
monthlen[i] = 31
}
monthlen[2] = 28
monthlen[4] = monthlen[6] = monthlen[9] = monthlen[11] = 30
}
/^#\tUpdated through/ || /^#\tFile expires on:/ {
last_lines = last_lines $0 "\n"
}
/^#[$][ \t]/ { updated = $2 }
/^#[@][ \t]/ { expires = $2 }
/^#/ { next }
{
@ -57,19 +78,28 @@ BEGIN {
} else {
sign = "23:59:59\t-"
}
if (month == "Jan") {
m = monthnum[month] - 1
if (m == 0) {
year--;
month = "Dec";
day = 31
} else if (month == "Jul") {
month = "Jun";
day = 30
m = 12
}
month = monthabbr[m]
day = monthlen[m]
day += m == 2 && year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)
printf "Leap\t%s\t%s\t%s\t%s\tS\n", year, month, day, sign
}
old_TAI_minus_UTC = TAI_minus_UTC
}
END {
# 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.
epoch_minus_NTP = ((1970 - 1900) * 365 + 17) * 24 * 60 * 60
print ""
print "# POSIX timestamps for the data in this file:"
printf "#updated %s\n", updated - epoch_minus_NTP
printf "#expires %s\n", expires - epoch_minus_NTP
printf "\n%s", last_lines
}

4
northamerica
View File

@ -1,3 +1,5 @@
# tzdb data for North and Central America and environs
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.
@ -48,7 +50,7 @@
#
# Most of the US soon followed suit. See:
# Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56.
# http://dx.doi.org/10.2307/3105430
# https://dx.doi.org/10.2307/3105430
# From Paul Eggert (2005-04-16):
# That 1883 transition occurred at 12:00 new time, not at 12:00 old time.

2
pacificnew
View File

@ -1,3 +1,5 @@
# tzdb data for proposed US election time (this file is obsolete)
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.

36
southamerica
View File

@ -1,3 +1,5 @@
# tzdb data for South America and environs
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.
@ -392,7 +394,7 @@ Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 -
# standard time, so let's do that here too. This does not change UTC
# offsets, only tm_isdst and the time zone abbreviations. One minor
# plus is that this silences a zic complaint that there's no POSIX TZ
# setting for time stamps past 2038.
# setting for timestamps past 2038.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
#
@ -925,6 +927,14 @@ Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 -
# ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html
# From Steffen Thorsen (2017-12-20):
# http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm
#
# From Fábio Gomes (2018-10-04):
# The Brazilian president just announced a new change on this year DST.
# It was scheduled to start on November 4th and it was changed to November 18th.
# From Rodrigo Brüning Wessler (2018-10-15):
# The Brazilian government just announced that the change in DST was
# canceled.... Maybe the president Michel Temer also woke up one hour
# earlier today. :)
Rule Brazil 2018 max - Nov Sun>=1 0:00 1:00 -
Rule Brazil 2023 only - Feb Sun>=22 0:00 0 -
Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 -
@ -1231,6 +1241,24 @@ Zone America/Rio_Branco -4:31:12 - LMT 1914
# they will switch from -03 to -04 one hour after Santiago does that day.
# For now, assume that they will not revert.
# From Juan Correa (2018-08-13):
# As of moments ago, the Ministry of Energy in Chile has announced the new
# schema for DST. ... Announcement in video (in Spanish):
# https://twitter.com/MinEnergia/status/1029000399129374720
# From Yonathan Dossow (2018-08-13):
# The video says "first Saturday of September", we all know it means Sunday at
# midnight.
# From Tim Parenti (2018-08-13):
# Translating the captions on the video at 0:44-0:55, "We want to announce as
# Government that from 2019, Winter Time will be increased to 5 months, between
# the first Saturday of April and the first Saturday of September."
# At 2:08-2:20, "The Magallanes region will maintain its current time, as
# decided by the citizens during 2017, but our Government will promote a
# regional dialogue table to gather their opinion on this matter."
# https://twitter.com/MinEnergia/status/1029009354001973248
# "We will keep the new time policy unchanged for at least the next 4 years."
# So we extend the new rules on Saturdays at 24:00 mainland time indefinitely.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Chile 1927 1931 - Sep 1 0:00 1:00 -
Rule Chile 1928 1932 - Apr 1 0:00 0 -
@ -1264,8 +1292,10 @@ Rule Chile 2011 only - May Sun>=2 3:00u 0 -
Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 -
Rule Chile 2012 2014 - Apr Sun>=23 3:00u 0 -
Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 -
Rule Chile 2016 max - May Sun>=9 3:00u 0 -
Rule Chile 2016 max - Aug Sun>=9 4:00u 1:00 -
Rule Chile 2016 2018 - May Sun>=9 3:00u 0 -
Rule Chile 2016 2018 - Aug Sun>=9 4:00u 1:00 -
Rule Chile 2019 max - Apr Sun>=2 3:00u 0 -
Rule Chile 2019 max - Sep Sun>=2 4:00u 1:00 -
# IATA SSIM anomalies: (1992-02) says 1992-03-14;
# (1996-09) says 1998-03-08. Ignore these.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]

2
systemv
View File

@ -1,3 +1,5 @@
# tzdb data for System V rules (this file is obsolete)
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.

203
theory.html
View File

@ -1,7 +1,11 @@
<!DOCTYPE html>
<html lang="en">
<head>
<title>Theory and pragmatics of the tz code and data</title>
<meta charset="UTF-8">
<style>
pre {margin-left: 2em; white-space: pre-wrap;}
</style>
</head>
<body>
@ -11,7 +15,7 @@
<ul>
<li><a href="#scope">Scope of the <code><abbr>tz</abbr></code>
database</a></li>
<li><a href="#naming">Names of time zone rulesets</a></li>
<li><a href="#naming">Names of timezones</a></li>
<li><a href="#abbreviations">Time zone abbreviations</a></li>
<li><a href="#accuracy">Accuracy of the <code><abbr>tz</abbr></code>
database</a></li>
@ -31,13 +35,13 @@ database</a> attempts to record the history and predicted future of
all computer-based clocks that track civil time.
It organizes <a href="tz-link.html">time zone and daylight saving time
data</a> by partitioning the world into <a
href="https://en.wikipedia.org/wiki/List_of_tz_database_time_zones">regions</a>
href="https://en.wikipedia.org/wiki/List_of_tz_database_time_zones"><dfn>timezones</dfn></a>
whose clocks all agree about timestamps that occur after the <a
href="https://en.wikipedia.org/wiki/Unix_time">POSIX Epoch</a>
(1970-01-01 00:00:00 <a
href="https://en.wikipedia.org/wiki/Coordinated_Universal_Time"><abbr
title="Coordinated Universal Time">UTC</abbr></a>).
The database labels each such region with a notable location and
The database labels each timezone with a notable location and
records all known clock transitions for that location.
Although 1970 is a somewhat-arbitrary cutoff, there are significant
challenges to moving the cutoff earlier even by a decade or two, due
@ -46,7 +50,24 @@ became prevalent.
</p>
<p>
Clock transitions before 1970 are recorded for each such location,
Each timezone typically corresponds to a geographical region that is
smaller than a traditional time zone, because clocks in a timezone
all agree after 1970 whereas a traditional time zone merely
specifies current standard time. For example, applications that deal
with current and future timestamps in the traditional North
American mountain time zone can choose from the timezones
<code>America/Denver</code> which observes US-style daylight saving
time, <code>America/Mazatlan</code> which observes Mexican-style DST,
and <code>America/Phoenix</code> which does not observe DST.
Applications that also deal with past timestamps in the mountain time
zone can choose from over a dozen timezones, such as
<code>America/Boise</code>, <code>America/Edmonton</code>, and
<code>America/Hermosillo</code>, each of which currently uses mountain
time but differs from other timezones for some timestamps after 1970.
</p>
<p>
Clock transitions before 1970 are recorded for each timezone,
because most systems support timestamps before 1970 and could
misbehave if data entries were omitted for pre-1970 transitions.
However, the database is not designed for and does not suffice for
@ -73,30 +94,36 @@ Edition.
Because the database's scope encompasses real-world changes to civil
timekeeping, its model for describing time is more complex than the
standard and daylight saving times supported by POSIX.
A <code><abbr>tz</abbr></code> region corresponds to a ruleset that can
A <code><abbr>tz</abbr></code> timezone corresponds to a ruleset that can
have more than two changes per year, these changes need not merely
flip back and forth between two alternatives, and the rules themselves
can change at times.
Whether and when a <code><abbr>tz</abbr></code> region changes its
clock, and even the region's notional base offset from UTC, are variable.
It does not always make sense to talk about a region's
"base offset", since it is not necessarily a single number.
Whether and when a timezone changes its
clock, and even the timezone's notional base offset from UTC, are variable.
It does not always make sense to talk about a timezone's
"base offset", which is not necessarily a single number.
</p>
</section>
<section>
<h2 id="naming">Names of time zone rulesets</h2>
<h2 id="naming">Names of timezones</h2>
<p>
Each <code><abbr>tz</abbr></code> region has a unique name that
corresponds to a set of time zone rules.
Each timezone has a unique name.
Inexperienced users are not expected to select these names unaided.
Distributors should provide documentation and/or a simple selection
interface that explains the names; for one example, see the
interface that explains each name via a map or via descriptive text like
"Ruthenia" instead of the timezone name "<code>Europe/Uzhgorod</code>".
If geolocation information is available, a selection interface can
locate the user on a timezone map or prioritize names that are
geographically close. For an example selection interface, see the
<code>tzselect</code> program in the <code><abbr>tz</abbr></code> code.
The <a href="http://cldr.unicode.org/">Unicode Common Locale Data
Repository</a> contains data that may be useful for other selection
interfaces.
interfaces; it maps timezone names like <code>Europe/Uzhgorod</code>
to CLDR names like <code>uauzh</code> which are in turn mapped to
locale-dependent strings like "Uzhhorod", "Ungvár", "Ужгород", and
"乌日哥罗德".
</p>
<p>
@ -106,12 +133,12 @@ among the following goals:
<ul>
<li>
Uniquely identify every region where clocks have agreed since 1970.
Uniquely identify every timezone where clocks have agreed since 1970.
This is essential for the intended use: static clocks keeping local
civil time.
</li>
<li>
Indicate to experts where that region is.
Indicate to experts where the timezone's clocks typically are.
</li>
<li>
Be robust in the presence of political changes.
@ -131,9 +158,8 @@ among the following goals:
<p>
Names normally have the form
<var>AREA</var><code>/</code><var>LOCATION</var>, where
<var>AREA</var> is the name of a continent or ocean, and
<var>LOCATION</var> is the name of a specific location within that
region.
<var>AREA</var> is a continent or ocean, and
<var>LOCATION</var> is a specific location within the area.
North and South America share the same area, '<code>America</code>'.
Typical names are '<code>Africa/Cairo</code>',
'<code>America/New_York</code>', and '<code>Pacific/Honolulu</code>'.
@ -144,7 +170,7 @@ Indiana from other Petersburgs in America.
<p>
Here are the general guidelines used for
choosing <code><abbr>tz</abbr></code> region names,
choosing timezone names,
in decreasing order of importance:
</p>
@ -196,9 +222,9 @@ in decreasing order of importance:
country or territory.
</li>
<li>
If all the clocks in a region have agreed since 1970,
do not bother to include more than one location
even if subregions' clocks disagreed before 1970.
If all the clocks in a timezone have agreed since 1970,
do not bother to include more than one timezone
even if some of the clocks disagreed before 1970.
Otherwise these tables would become annoyingly large.
</li>
<li>
@ -212,7 +238,7 @@ in decreasing order of importance:
Keep locations compact.
Use cities or small islands, not countries or regions, so that any
future changes do not split individual locations into different
<code><abbr>tz</abbr></code> regions.
timezones.
E.g., prefer <code>Europe/Paris</code> to <code>Europe/France</code>,
since
<a href="https://en.wikipedia.org/wiki/Time_in_France#History">France
@ -220,10 +246,10 @@ in decreasing order of importance:
</li>
<li>
Use mainstream English spelling, e.g., prefer
<code>Europe/Rome</code> to <code>Europe/Roma</code>, and
<code>Europe/Rome</code> to <code>Europa/Roma</code>, and
prefer <code>Europe/Athens</code> to the Greek
<code>Europe/Αθήνα</code> or the Romanized
<code>Europe/Athína</code>.
<code>Ευρώπη/Αθήνα</code> or the Romanized
<code>Evrópi/Athína</code>.
The POSIX file name restrictions encourage this guideline.
</li>
<li>
@ -274,9 +300,9 @@ in decreasing order of importance:
<p>
The file '<code>zone1970.tab</code>' lists geographical locations used
to name <code><abbr>tz</abbr></code> regions.
to name timezones.
It is intended to be an exhaustive list of names for geographic
regions as described above; this is a subset of the names in the data.
regions as described above; this is a subset of the timezones in the data.
Although a '<code>zone1970.tab</code>' location's
<a href="https://en.wikipedia.org/wiki/Longitude">longitude</a>
corresponds to
@ -398,6 +424,7 @@ in decreasing order of importance:
NZST/NZDT New Zealand 1946&ndash;present,
PKT/PKST Pakistan,
PST/PDT/PWT/PPT/PDDT Pacific,
PST/PDT Philippine,
SAST South Africa,
SST Samoa,
WAT/WAST West Africa,
@ -453,7 +480,7 @@ in decreasing order of importance:
<p>
<small>A few abbreviations also follow the pattern that
<abbr>GMT<abbr>/<abbr>BST</abbr> established for time in the UK.
<abbr>GMT</abbr>/<abbr>BST</abbr> established for time in the UK.
They are:
CMT/BST for Calamarca Mean Time and Bolivian Summer Time
1890&ndash;1932,
@ -473,7 +500,7 @@ in decreasing order of importance:
</li>
<li>
If there is no common English abbreviation, use numeric offsets like
<code>-</code>05 and <code>+</code>0830 that are generated
<code>-</code>05 and <code>+</code>0530 that are generated
by <code>zic</code>'s <code>%z</code> notation.
</li>
<li>
@ -488,8 +515,8 @@ in decreasing order of importance:
usage.
</li>
<li>
Use a consistent style in a <code><abbr>tz</abbr></code> region's history.
For example, if history tends to use numeric
Use a consistent style in a timezone's history.
For example, if a history tends to use numeric
abbreviations and a particular entry could go either way, use a
numeric abbreviation.
</li>
@ -501,7 +528,7 @@ in decreasing order of importance:
The leading '<code>-</code>' is a flag that the <abbr>UT</abbr> offset is in
some sense undefined; this notation is derived
from <a href="https://tools.ietf.org/html/rfc3339">Internet
<abbr title="Request For Comments">RFC 3339</a>.
<abbr title="Request For Comments">RFC</abbr> 3339</a>.
</li>
</ul>
@ -543,7 +570,7 @@ Errors in the <code><abbr>tz</abbr></code> database arise from many sources:
The pre-1970 entries in this database cover only a tiny sliver of how
clocks actually behaved; the vast majority of the necessary
information was lost or never recorded.
Thousands more <code><abbr>tz</abbr></code> regions would be needed if
Thousands more timezones would be needed if
the <code><abbr>tz</abbr></code> database's scope were extended to
cover even just the known or guessed history of standard time; for
example, the current single entry for France would need to split
@ -608,19 +635,19 @@ href="https://www.dissentmagazine.org/blog/booked-a-global-history-of-time-vanes
</li>
<li>
The <code><abbr>tz</abbr></code> database does not record the
earliest time for which a <code><abbr>tz</abbr></code> region's
earliest time for which a timezone's
data entries are thereafter valid for every location in the region.
For example, <code>Europe/London</code> is valid for all locations
in its region after <abbr>GMT</abbr> was made the standard time,
but the date of standardization (1880-08-02) is not in the
<code><abbr>tz</abbr></code> database, other than in commentary.
For many <code><abbr>tz</abbr></code> regions the earliest time of
For many timezones the earliest time of
validity is unknown.
</li>
<li>
The <code><abbr>tz</abbr></code> database does not record a
region's boundaries, and in many cases the boundaries are not known.
For example, the <code><abbr>tz</abbr></code> region
For example, the timezone
<code>America/Kentucky/Louisville</code> represents a region
around the city of Louisville, the boundaries of which are
unclear.
@ -664,19 +691,39 @@ href="https://www.dissentmagazine.org/blog/booked-a-global-history-of-time-vanes
way to specify Easter, these exceptional years are entered as
separate <code><abbr>tz</abbr> Rule</code> lines, even though the
legal rules did not change.
When transitions are known but the historical rules behind them are not,
the database contains <code>Zone</code> and <code>Rule</code>
entries that are intended to represent only the generated
transitions, not any underlying historical rules; however, this
intent is recorded at best only in commentary.
</li>
<li>
The <code><abbr>tz</abbr></code> database models pre-standard time
The <code><abbr>tz</abbr></code> database models time
using the <a
href="https://en.wikipedia.org/wiki/Proleptic_Gregorian_calendar">proleptic
Gregorian calendar</a> and local mean time, but many people used
other calendars and other timescales.
Gregorian calendar</a> with days containing 24 equal-length hours
numbered 00 through 23, except when clock transitions occur.
Pre-standard time is modeled as local mean time.
However, historically many people used other calendars and other timescales.
For example, the Roman Empire used
the <a href="https://en.wikipedia.org/wiki/Julian_calendar">Julian
calendar</a>,
and <a href="https://en.wikipedia.org/wiki/Roman_timekeeping">Roman
timekeeping</a> had twelve varying-length daytime hours with a
non-hour-based system at night.
And even today, some local practices diverge from the Gregorian
calendar with 24-hour days. These divergences range from
relatively minor, such as Japanese bars giving times like "24:30" for the
wee hours of the morning, to more-significant differences such as <a
href="https://www.pri.org/stories/2015-01-30/if-you-have-meeting-ethiopia-you-better-double-check-time">the
east African practice of starting the day at dawn</a>, renumbering
the Western 06:00 to be 12:00. These practices are largely outside
the scope of the <code><abbr>tz</abbr></code> code and data, which
provide only limited support for date and time localization
such as that required by POSIX. If DST is not used a different time zone
can often do the trick; for example, in Kenya a <code>TZ</code> setting
like <code>&lt;-03&gt;3</code> or <code>America/Cayenne</code> starts
the day six hours later than <code>Africa/Nairobi</code> does.
</li>
<li>
Early clocks were less reliable, and data entries do not represent
@ -710,7 +757,7 @@ href="https://www.dissentmagazine.org/blog/booked-a-global-history-of-time-vanes
historical <a href="https://en.wikipedia.org/wiki/Solar_time">solar time</a>
to more than about one-hour accuracy.
See: Stephenson FR, Morrison LV, Hohenkerk CY.
<a href="http://dx.doi.org/10.1098/rspa.2016.0404">Measurement of
<a href="https://dx.doi.org/10.1098/rspa.2016.0404">Measurement of
the Earth's rotation: 720 BC to AD 2015</a>.
<cite>Proc Royal Soc A</cite>. 2016 Dec 7;472:20160404.
Also see: Espenak F. <a
@ -746,7 +793,7 @@ Any attempt to pass the
should be unacceptable to anybody who cares about the facts.
In particular, the <code><abbr>tz</abbr></code> database's
<abbr>LMT</abbr> offsets should not be considered meaningful, and
should not prompt creation of <code><abbr>tz</abbr></code> regions
should not prompt creation of timezones
merely because two locations
differ in <abbr>LMT</abbr> or transitioned to standard time at
different dates.
@ -798,7 +845,7 @@ an older <code>zic</code>.
<dl>
<dt><var>std</var> and <var>dst</var></dt><dd>
are 3 or more characters specifying the standard
and daylight saving time (<abbr>DST</abbr>) zone names.
and daylight saving time (<abbr>DST</abbr>) zone abbreviations.
Starting with POSIX.1-2001, <var>std</var> and <var>dst</var>
may also be in a quoted form like '<code>&lt;+09&gt;</code>';
this allows "<code>+</code>" and "<code>-</code>" in the names.
@ -870,38 +917,38 @@ an older <code>zic</code>.
<pre><code>TZ='Pacific/Auckland'</code></pre>
</li>
<li>
POSIX does not define the exact meaning of <code>TZ</code> values like
POSIX does not define the <abbr>DST</abbr> transitions
for <code>TZ</code> values like
"<code>EST5EDT</code>".
Typically the current <abbr>US</abbr> <abbr>DST</abbr> rules
are used to interpret such values, but this means that the
<abbr>US</abbr> <abbr>DST</abbr> rules are compiled into each
program that does time conversion.
This means that when
<abbr>US</abbr> time conversion rules change (as in the United
States in 1987), all programs that do time conversion must be
Traditionally the current <abbr>US</abbr> <abbr>DST</abbr> rules
were used to interpret such values, but this meant that the
<abbr>US</abbr> <abbr>DST</abbr> rules were compiled into each
program that did time conversion. This meant that when
<abbr>US</abbr> time conversion rules changed (as in the United
States in 1987), all programs that did time conversion had to be
recompiled to ensure proper results.
</li>
<li>
The <code>TZ</code> environment variable is process-global, which
makes it hard to write efficient, thread-safe applications that
need access to multiple time zone rulesets.
need access to multiple timezones.
</li>
<li>
In POSIX, there is no tamper-proof way for a process to learn the
system's best idea of local wall clock.
(This is important for applications that an administrator wants
This is important for applications that an administrator wants
used only at certain times &ndash; without regard to whether the
user has fiddled the
<code>TZ</code> environment variable.
While an administrator can "do everything in <abbr>UT</abbr>" to
get around the problem, doing so is inconvenient and precludes
handling daylight saving time shifts - as might be required to
limit phone calls to off-peak hours.)
handling daylight saving time shifts &ndash; as might be required to
limit phone calls to off-peak hours.
</li>
<li>
POSIX provides no convenient and efficient way to determine
the <abbr>UT</abbr> offset and time zone abbreviation of arbitrary
timestamps, particularly for <code><abbr>tz</abbr></code> regions
timestamps, particularly for timezones
that do not fit into the POSIX model.
</li>
<li>
@ -919,7 +966,7 @@ an older <code>zic</code>.
Unsigned 32-bit integers are used on one or two platforms, and 36-bit
and 40-bit integers are also used occasionally.
Although earlier POSIX versions allowed <code>time_t</code> to be a
floating-point type, this was not supported by any practical systems,
floating-point type, this was not supported by any practical system,
and POSIX.1-2013 and the <code><abbr>tz</abbr></code> code both
require <code>time_t</code> to be an integer type.
</li>
@ -931,15 +978,16 @@ an older <code>zic</code>.
<li>
<p>
The <code>TZ</code> environment variable is used in generating
the name of a binary file from which time-related information is read
the name of a file from which time-related information is read
(or is interpreted à la POSIX); <code>TZ</code> is no longer
constrained to be a three-letter time zone
abbreviation followed by a number of hours and an optional three-letter
daylight time zone abbreviation.
constrained to be a string containing abbreviations
and numeric data as described <a href="#POSIX">above</a>.
The file's format is <dfn><abbr>TZif</abbr></dfn>,
a timezone information format that contains binary data.
The daylight saving time rules to be used for a
particular <code><abbr>tz</abbr></code> region are encoded in the
binary file; the format of the file
allows U.S., Australian, and other rules to be encoded, and
particular timezone are encoded in the
<abbr>TZif</abbr> file; the format of the file allows <abbr>US</abbr>,
Australian, and other rules to be encoded, and
allows for situations where more than two time zone
abbreviations are used.
</p>
@ -949,15 +997,15 @@ an older <code>zic</code>.
might cause "old" programs (that expect <code>TZ</code> to have a
certain form) to operate incorrectly; consideration was given to using
some other environment variable (for example, <code>TIMEZONE</code>)
to hold the string used to generate the binary file's name.
to hold the string used to generate the <abbr>TZif</abbr> file's name.
In the end, however, it was decided to continue using
<code>TZ</code>: it is widely used for time zone purposes;
separately maintaining both <code>TZ</code>
and <code>TIMEZONE</code> seemed a nuisance; and systems where
"new" forms of <code>TZ</code> might cause problems can simply
use <code>TZ</code> values such as "<code>EST5EDT</code>" which
can be used both by "new" programs (à la POSIX) and "old"
programs (as zone names and offsets).
use legacy <code>TZ</code> values such as "<code>EST5EDT</code>" which
can be used by "new" programs as well as by "old" programs that
assume pre-POSIX <code>TZ</code> values.
</p>
</li>
<li>
@ -972,7 +1020,7 @@ an older <code>zic</code>.
Functions <code>tzalloc</code>, <code>tzfree</code>,
<code>localtime_rz</code>, and <code>mktime_z</code> for
more-efficient thread-safe applications that need to use multiple
time zone rulesets.
timezones.
The <code>tzalloc</code> and <code>tzfree</code> functions
allocate and free objects of type <code>timezone_t</code>,
and <code>localtime_rz</code> and <code>mktime_z</code> are
@ -1093,8 +1141,9 @@ The vestigial <abbr>API</abbr>s are:
standardization proposals.
</li>
<li>
Other time conversion proposals, in particular the one developed
by folks at Hewlett Packard, offer a wider selection of functions
Other time conversion proposals, in particular those supported by the
<a href="https://howardhinnant.github.io/date/tz.html">Time Zone
Database Parser</a>, offer a wider selection of functions
that provide capabilities beyond those provided here.
The absence of such functions from this package is not meant to
discourage the development, standardization, or use of such
@ -1116,8 +1165,8 @@ The <code><abbr>tz</abbr></code> code and data supply the following interfaces:
<ul>
<li>
A set of <code><abbr>tz</abbr></code> region names as per
"<a href="#naming">Names of time zone rulesets</a>" above.
A set of timezone names as per
"<a href="#naming">Names of timezones</a>" above.
</li>
<li>
Library functions described in "<a href="#functions">Time and date
@ -1186,7 +1235,7 @@ They sometimes disagree.
<h2 id="planets">Time and time zones on other planets</h2>
<p>
Some people's work schedules
use <a href="https://en.wikipedia.org/wiki/Timekeeping on Mars">Mars time</a>.
use <a href="https://en.wikipedia.org/wiki/Timekeeping_on_Mars">Mars time</a>.
Jet Propulsion Laboratory (JPL) coordinators kept Mars time on
and off during the
<a href="https://en.wikipedia.org/wiki/Mars_Pathfinder#End_of_mission">Mars
@ -1218,7 +1267,7 @@ Coordinated Time (<abbr>MTC</abbr>)</a>.
<p>
Each landed mission on Mars has adopted a different reference for
solar time keeping, so there is no real standard for Mars time zones.
solar timekeeping, so there is no real standard for Mars time zones.
For example, the
<a href="https://en.wikipedia.org/wiki/Mars_Exploration_Rover">Mars
Exploration Rover</a> project (2004) defined two time zones "Local
@ -1290,7 +1339,7 @@ Sources for time on other planets:
Matt Williams,
"<a href="https://www.universetoday.com/37481/days-of-the-planets/">How
long is a day on the other planets of the solar system?</a>"
(2017-04-27).
(2016-01-20).
</li>
</ul>
</section>

2
version
View File

@ -1 +1 @@
2018e
2018f

1
yearistype.sh
View File

@ -1,4 +1,5 @@
#! /bin/sh
: 'Determine whether year is of appropriate type (this file is obsolete).'
: 'This file is in the public domain, so clarified as of'
: '2006-07-17 by Arthur David Olson.'

206
zishrink.awk
View File

@ -6,28 +6,146 @@
# 'zic' should treat this script's output as if it were identical to
# this script's input.
# Record a hash N for the new name NAME, checking for collisions.
# Return a new rule name.
# N_RULE_NAMES keeps track of how many rule names have been generated.
function gen_rule_name(alphabet, base, rule_name, n, digit)
function record_hash(n, name)
{
alphabet = ""
alphabet = alphabet "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
alphabet = alphabet "abcdefghijklmnopqrstuvwxyz"
alphabet = alphabet "!$%&'()*+,./:;<=>?@[\\]^_`{|}~"
base = length(alphabet)
rule_name = ""
n = n_rule_names++
if (used_hashes[n]) {
printf "# ! collision: %s %s\n", used_hashes[n], name
exit 1
}
used_hashes[n] = name
}
do {
n -= rule_name && n <= base
digit = n % base
rule_name = substr(alphabet, digit + 1, 1) rule_name
n = (n - digit) / base
} while (n);
# Return a shortened rule name representing NAME,
# and record this relationship to the hash table.
return rule_name
function gen_rule_name(name, n)
{
# Use a simple memonic: the first two letters.
n = substr(name, 1, 2)
record_hash(n, name)
# printf "# %s = %s\n", n, name
return n
}
function prehash_rule_names(name)
{
# Rule names are not part of the tzdb API, so substitute shorter
# ones. Shortening them consistently from one release to the next
# simplifies comparison of the output. That being said, the
# 1-letter names below are not standardized in any way, and can
# change arbitrarily from one release to the next, as the main goal
# here is compression not comparison.
# Abbreviating these rules names to one letter saved the most space
# circa 2018e.
rule["Arg"] = "A"
rule["Brazil"] = "B"
rule["Canada"] = "C"
rule["Denmark"] = "D"
rule["EU"] = "E"
rule["France"] = "F"
rule["GB-Eire"] = "G"
rule["Halifax"] = "H"
rule["Italy"] = "I"
rule["Jordan"] = "J"
rule["Egypt"] = "K" # "Kemet" in ancient Egyptian
rule["Libya"] = "L"
rule["Morocco"] = "M"
rule["Neth"] = "N"
rule["Poland"] = "O" # arbitrary
rule["Palestine"] = "P"
rule["Cuba"] = "Q" # Its start sounds like "Q".
rule["Russia"] = "R"
rule["Syria"] = "S"
rule["Turkey"] = "T"
rule["Uruguay"] = "U"
rule["Vincennes"] = "V"
rule["Winn"] = "W"
rule["Mongol"] = "X" # arbitrary
rule["NT_YK"] = "Y"
rule["Zion"] = "Z"
rule["Austria"] = "a"
rule["Belgium"] = "b"
rule["C-Eur"] = "c"
rule["Algeria"] = "d" # country code DZ
rule["E-Eur"] = "e"
rule["Taiwan"] = "f" # Formosa
rule["Greece"] = "g"
rule["Hungary"] = "h"
rule["Iran"] = "i"
rule["StJohns"] = "j"
rule["Chatham"] = "k" # arbitrary
rule["Lebanon"] = "l"
rule["Mexico"] = "m"
rule["Tunisia"] = "n" # country code TN
rule["Moncton"] = "o" # arbitrary
rule["Port"] = "p"
rule["Albania"] = "q" # arbitrary
rule["Regina"] = "r"
rule["Spain"] = "s"
rule["Toronto"] = "t"
rule["US"] = "u"
rule["Louisville"] = "v" # ville
rule["Iceland"] = "w" # arbitrary
rule["Chile"] = "x" # arbitrary
rule["Para"] = "y" # country code PY
rule["Romania"] = "z" # arbitrary
rule["Macau"] = "_" # arbitrary
# Use ISO 3166 alpha-2 country codes for remaining names that are countries.
# This is more systematic, and avoids collisions (e.g., Malta and Moldova).
rule["Armenia"] = "AM"
rule["Aus"] = "AU"
rule["Azer"] = "AZ"
rule["Barb"] = "BB"
rule["Dhaka"] = "BD"
rule["Bulg"] = "BG"
rule["Bahamas"] = "BS"
rule["Belize"] = "BZ"
rule["Swiss"] = "CH"
rule["Cook"] = "CK"
rule["PRC"] = "CN"
rule["Cyprus"] = "CY"
rule["Czech"] = "CZ"
rule["Germany"] = "DE"
rule["DR"] = "DO"
rule["Ecuador"] = "EC"
rule["Finland"] = "FI"
rule["Fiji"] = "FJ"
rule["Falk"] = "FK"
rule["Ghana"] = "GH"
rule["Guat"] = "GT"
rule["Hond"] = "HN"
rule["Haiti"] = "HT"
rule["Eire"] = "IE"
rule["Iraq"] = "IQ"
rule["Japan"] = "JP"
rule["Kyrgyz"] = "KG"
rule["ROK"] = "KR"
rule["Latvia"] = "LV"
rule["Lux"] = "LX"
rule["Moldova"] = "MD"
rule["Malta"] = "MT"
rule["Mauritius"] = "MU"
rule["Namibia"] = "NA"
rule["Nic"] = "NI"
rule["Norway"] = "NO"
rule["Peru"] = "PE"
rule["Phil"] = "PH"
rule["Pakistan"] = "PK"
rule["Sudan"] = "SD"
rule["Salv"] = "SV"
rule["Tonga"] = "TO"
rule["Vanuatu"] = "VU"
# Avoid collisions.
rule["Detroit"] = "Dt" # De = Denver
for (name in rule) {
record_hash(rule[name], name)
}
}
# Process an input line and save it for later output.
@ -54,6 +172,11 @@ function process_input_line(line, field, end, i, n, startdef)
if (line ~ /^R /) return
line = substr(line, 1, RSTART) substr(line, RSTART + 5)
}
# Replace SpainAfrica rules with Morocco, as they are duplicates.
if (match(line, / SpainAfrica /)) {
if (line ~ /^R /) return
line = substr(line, 1, RSTART) "Morocco" substr(line, RSTART + RLENGTH - 1)
}
# Abbreviate times.
while (match(line, /[: ]0+[0-9]/))
@ -106,7 +229,7 @@ function process_input_line(line, field, end, i, n, startdef)
i = field[1] == "Z" ? 4 : field[1] == "Li" ? 0 : 2
if (i && field[i] ~ /^[^-+0-9]/) {
if (!rule[field[i]])
rule[field[i]] = gen_rule_name()
rule[field[i]] = gen_rule_name(field[i])
field[i] = rule[field[i]]
}
@ -144,8 +267,53 @@ function output_saved_lines(i)
}
BEGIN {
# Files that the output normally depends on.
default_dep["africa"] = 1
default_dep["antarctica"] = 1
default_dep["asia"] = 1
default_dep["australasia"] = 1
default_dep["backward"] = 1
default_dep["etcetera"] = 1
default_dep["europe"] = 1
default_dep["factory"] = 1
default_dep["northamerica"] = 1
default_dep["southamerica"] = 1
default_dep["systemv"] = 1
default_dep["ziguard.awk"] = 1
default_dep["zishrink.awk"] = 1
# Output a version string from 'version' and related configuration variables
# supported by tzdb's Makefile. If you change the makefile or any other files
# that affect the output of this script, you should append '-SOMETHING'
# to the contents of 'version', where SOMETHING identifies what was changed.
ndeps = split(deps, dep)
ddeps = ""
for (i = 1; i <= ndeps; i++) {
if (default_dep[dep[i]]) {
default_dep[dep[i]]++
} else {
ddeps = ddeps " " dep[i]
}
}
for (d in default_dep) {
if (default_dep[d] == 1) {
ddeps = ddeps " !" d
}
}
print "# version", version
if (dataform != "main") {
print "# dataform", dataform
}
if (redo != "posix_right") {
print "# redo " redo
}
if (ddeps) {
print "# ddeps" ddeps
}
print "# This zic input file is in the public domain."
prehash_rule_names()
}
/^[\t ]*[^#\t ]/ {

14
zone.tab
View File

@ -1,9 +1,9 @@
# tz zone descriptions (deprecated version)
# tzdb timezone descriptions (deprecated version)
#
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.
#
# From Paul Eggert (2014-07-31):
# From Paul Eggert (2018-06-27):
# This file is intended as a backward-compatibility aid for older programs.
# New programs should use zone1970.tab. This file is like zone1970.tab (see
# zone1970.tab's comments), but with the following additional restrictions:
@ -12,13 +12,13 @@
# 2. The first data column contains exactly one country code.
#
# Because of (2), each row stands for an area that is the intersection
# of a region identified by a country code and of a zone where civil
# of a region identified by a country code and of a timezone where civil
# clocks have agreed since 1970; this is a narrower definition than
# that of zone1970.tab.
#
# This table is intended as an aid for users, to help them select time
# zone data entries appropriate for their practical needs. It is not
# intended to take or endorse any position on legal or territorial claims.
# This table is intended as an aid for users, to help them select timezones
# appropriate for their practical needs. It is not intended to take or
# endorse any position on legal or territorial claims.
#
#country-
#code coordinates TZ comments
@ -268,7 +268,7 @@ MM +1647+09610 Asia/Yangon
MN +4755+10653 Asia/Ulaanbaatar Mongolia (most areas)
MN +4801+09139 Asia/Hovd Bayan-Olgiy, Govi-Altai, Hovd, Uvs, Zavkhan
MN +4804+11430 Asia/Choibalsan Dornod, Sukhbaatar
MO +2214+11335 Asia/Macau
MO +221150+1133230 Asia/Macau
MP +1512+14545 Pacific/Saipan
MQ +1436-06105 America/Martinique
MR +1806-01557 Africa/Nouakchott

32
zone1970.tab
View File

@ -1,35 +1,35 @@
# tz zone descriptions
# tzdb timezone descriptions
#
# This file is in the public domain.
#
# From Paul Eggert (2017-10-01):
# This file contains a table where each row stands for a zone where
# civil time stamps have agreed since 1970. Columns are separated by
# From Paul Eggert (2018-06-27):
# This file contains a table where each row stands for a timezone where
# civil timestamps have agreed since 1970. Columns are separated by
# a single tab. Lines beginning with '#' are comments. All text uses
# UTF-8 encoding. The columns of the table are as follows:
#
# 1. The countries that overlap the zone, as a comma-separated list
# 1. The countries that overlap the timezone, as a comma-separated list
# of ISO 3166 2-character country codes. See the file 'iso3166.tab'.
# 2. Latitude and longitude of the zone's principal location
# 2. Latitude and longitude of the timezone's principal location
# in ISO 6709 sign-degrees-minutes-seconds format,
# either ±DDMM±DDDMM or ±DDMMSS±DDDMMSS,
# first latitude (+ is north), then longitude (+ is east).
# 3. Zone name used in value of TZ environment variable.
# Please see the theory.html file for how zone names are chosen.
# If multiple zones overlap a country, each has a row in the
# 3. Timezone name used in value of TZ environment variable.
# Please see the theory.html file for how these names are chosen.
# If multiple timezones overlap a country, each has a row in the
# table, with each column 1 containing the country code.
# 4. Comments; present if and only if a country has multiple zones.
# 4. Comments; present if and only if a country has multiple timezones.
#
# If a zone covers multiple countries, the most-populous city is used,
# If a timezone covers multiple countries, the most-populous city is used,
# and that country is listed first in column 1; any other countries
# are listed alphabetically by country code. The table is sorted
# first by country code, then (if possible) by an order within the
# country that (1) makes some geographical sense, and (2) puts the
# most populous zones first, where that does not contradict (1).
# most populous timezones first, where that does not contradict (1).
#
# This table is intended as an aid for users, to help them select time
# zone data entries appropriate for their practical needs. It is not
# intended to take or endorse any position on legal or territorial claims.
# This table is intended as an aid for users, to help them select timezones
# appropriate for their practical needs. It is not intended to take or
# endorse any position on legal or territorial claims.
#
#country-
#codes coordinates TZ comments
@ -231,7 +231,7 @@ MM +1647+09610 Asia/Yangon
MN +4755+10653 Asia/Ulaanbaatar Mongolia (most areas)
MN +4801+09139 Asia/Hovd Bayan-Ölgii, Govi-Altai, Hovd, Uvs, Zavkhan
MN +4804+11430 Asia/Choibalsan Dornod, Sükhbaatar
MO +2214+11335 Asia/Macau
MO +221150+1133230 Asia/Macau
MQ +1436-06105 America/Martinique
MT +3554+01431 Europe/Malta
MU -2010+05730 Indian/Mauritius

1
zoneinfo2tdf.pl
View File

@ -1,4 +1,5 @@
#! /usr/bin/perl -w
# Summarize .zi input in a .zi-like format.
# Courtesy Ken Pizzini.