Makefile

 # 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.
+# Request POSIX conformance; this must be the first non-comment line.
+.POSIX:
+# On older platforms you may need to scrounge for a POSIX-conforming 'make'.
+# For example, on Solaris 10 (2005), use /usr/sfw/bin/gmake or
+# /usr/xpg4/bin/make, not /usr/ccs/bin/make.
+
+# To affect how this Makefile works, you can run a shell script like this:
+#
+#	#!/bin/sh
+#	make CC='gcc -std=gnu11' "$@"
+#
+# This example script is appropriate for a pre-2017 GNU/Linux system
+# where a non-default setting is needed to support this package's use of C99.
+#
+# Alternatively, you can simply edit this Makefile to tailor the following
+# macro definitions.
+
+###############################################################################
+# Start of macros that one plausibly might want to tailor.
 
 # Package name for the code distribution.
 PACKAGE=	tzcode
@@ -191,8 +209,9 @@ UTF8_LOCALE=	en_US.utf8
 # On some hosts, this should have -lintl unless CFLAGS has -DHAVE_GETTEXT=0.
 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".
+# Add the following to an uncommented "CFLAGS=" line as needed
+# to override defaults specified in the source code or by the system.
+# "-DFOO" is equivalent to "-DFOO=1".
 #  -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
@@ -234,11 +253,16 @@ LDLIBS=
 #  -DHAVE_UNISTD_H=0 if <unistd.h> does not work*
 #  -DHAVE_UTMPX_H=0 if <utmpx.h> does not work*
 #  -Dlocale_t=XXX if your system uses XXX instead of locale_t
-#  -DPORT_TO_C89 if tzcode should also run on C89 platforms+
+#  -DPORT_TO_C89 if tzcode should also run on mostly-C89 platforms+
+#	Typically it is better to use a later standard.  For example,
+#	with GCC 4.9.4 (2016), prefer '-std=gnu11' to '-DPORT_TO_C89'.
+#	Even with -DPORT_TO_C89, the code needs at least one C99
+#	feature (integers at least 64 bits wide) and maybe more.
 #  -DRESERVE_STD_EXT_IDS if your platform reserves standard identifiers
 #	with external linkage, e.g., applications cannot define 'localtime'.
 #  -Dssize_t=long on hosts like MS-Windows that lack ssize_t
 #  -DSUPPORT_C89 if the tzcode library should support C89 callers+
+#	However, this might trigger latent bugs in C99-or-later callers.
 #  -DSUPPRESS_TZDIR to not prepend TZDIR to file names; this has
 #	security implications and is not recommended for general use
 #  -DTHREAD_SAFE to make localtime.c thread-safe, as POSIX requires;
@@ -270,11 +294,15 @@ LDLIBS=
 #  -DZIC_MAX_ABBR_LEN_WO_WARN=3
 #	(or some other number) to set the maximum time zone abbreviation length
 #	that zic will accept without a warning (the default is 6)
+#  -g to generate symbolic debugging info
+#  -Idir to include from directory 'dir'
+#  -O0 to disable optimization; other -O options to enable more optimization
+#  -Uname to remove any definition of the macro 'name'
 #  $(GCC_DEBUG_FLAGS) if you are using recent GCC and want lots of checking
 #
 # * Options marked "*" can be omitted if your compiler is C23 compatible.
 # * Options marked "+" are obsolescent and are planned to be removed
-#   once the code assumes C99 or later.
+#   once the code assumes C99 or later, say in the year 2029.
 #
 # Select instrumentation via "make GCC_INSTRUMENT='whatever'".
 GCC_INSTRUMENT = \
@@ -353,9 +381,11 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \
 # functions to be added to the time conversion library.
 # "offtime" is like "gmtime" except that it accepts a second (long) argument
 # that gives an offset to add to the time_t when converting it.
-# "timelocal" is equivalent to "mktime".
+# I.e., "offtime" is like calling "localtime_rz" with a fixed-offset zone.
+# "timelocal" is nearly equivalent to "mktime".
 # "timeoff" is like "timegm" except that it accepts a second (long) argument
 # that gives an offset to use when converting to a time_t.
+# I.e., "timeoff" is like calling "mktime_z" with a fixed-offset zone.
 # "posix2time" and "time2posix" are described in an included manual page.
 # X3J11's work does not describe any of these functions.
 # These functions may well disappear in future releases of the time
@@ -378,7 +408,7 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \
 #
 # NIST-PCTS:151-2, Version 1.4, (1993-12-03) is a test suite put
 # out by the National Institute of Standards and Technology
-# which claims to test C and Posix conformance.  If you want to pass PCTS, add
+# which claims to test C and POSIX conformance.  If you want to pass PCTS, add
 #	-DPCTS
 # to the end of the "CFLAGS=" line.
 #
@@ -388,13 +418,21 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \
 # 53 as a week number (rather than 52 or 53) for January days before
 # January's first Monday when a "%V" format is used and January 1
 # falls on a Friday, Saturday, or Sunday.
+#
+# POSIX says CFLAGS defaults to "-O 1".
+# Uncomment the following line and edit its contents as needed.
 
-CFLAGS=
+#CFLAGS= -O 1
 
-# Linker flags.  Default to $(LFLAGS) for backwards compatibility
-# to release 2012h and earlier.
 
-LDFLAGS=	$(LFLAGS)
+# The name of a POSIX-like library archiver, its flags, C compiler,
+# linker flags, and 'make' utility.  Ordinarily the defaults suffice.
+# The commented-out values are the defaults specified by POSIX 202x/D3.
+#AR = ar
+#ARFLAGS = -rv
+#CC = c17
+#LDFLAGS =
+#MAKE = make
 
 # For leap seconds, this Makefile uses LEAPSECONDS='-L leapseconds' in
 # submake command lines.  The default is no leap seconds.
@@ -418,18 +456,18 @@ ZFLAGS=
 
 ZIC_INSTALL=	$(ZIC) -d '$(DESTDIR)$(TZDIR)' $(LEAPSECONDS)
 
-# The name of a Posix-compliant 'awk' on your system.
+# The name of a POSIX-compliant 'awk' on your system.
 # mawk 1.3.3 and Solaris 10 /usr/bin/awk do not work.
 # Also, it is better (though not essential) if 'awk' supports UTF-8,
 # and unfortunately mawk and busybox awk do not support UTF-8.
 # Try AWK=gawk or AWK=nawk if your awk has the abovementioned problems.
 AWK=		awk
 
-# The full path name of a Posix-compliant shell, preferably one that supports
+# The full path name of a POSIX-compliant shell, preferably one that supports
 # the Korn shell's 'select' statement as an extension.
 # These days, Bash is the most popular.
 # It should be OK to set this to /bin/sh, on platforms where /bin/sh
-# lacks 'select' or doesn't completely conform to Posix, but /bin/bash
+# lacks 'select' or doesn't completely conform to POSIX, but /bin/bash
 # is typically nicer if it works.
 KSHELL=		/bin/bash
 
@@ -503,17 +541,16 @@ GZIPFLAGS=	-9n
 DIFF_TZS=	 diff -u$$(! diff -u -F'^TZ=' - - <>/dev/null >&0 2>&1 \
 			   || echo ' -F^TZ=')
 
-###############################################################################
-
-#MAKE=		make
+# ':' on typical hosts; 'ranlib' on the ancient hosts that still need ranlib.
+RANLIB=		:
 
-cc=		cc
-CC=		$(cc) -DTZDIR='"$(TZDIR)"'
+# POSIX prohibits defining or using SHELL.  However, csh users on systems
+# that use the user shell for Makefile commands may need to define SHELL.
+#SHELL=		/bin/sh
 
-AR=		ar
+# End of macros that one plausibly might want to tailor.
+###############################################################################
 
-# ':' on typical hosts; 'ranlib' on the ancient hosts that still need ranlib.
-RANLIB=		:
 
 TZCOBJS=	zic.o
 TZDOBJS=	zdump.o localtime.o asctime.o strftime.o
@@ -543,7 +580,7 @@ YDATA=		$(PRIMARY_YDATA) etcetera
 NDATA=		factory
 TDATA_TO_CHECK=	$(YDATA) $(NDATA) backward
 TDATA=		$(YDATA) $(NDATA) $(BACKWARD)
-ZONETABLES=	zone1970.tab zone.tab
+ZONETABLES=	zone.tab zone1970.tab zonenow.tab
 TABDATA=	iso3166.tab $(TZDATA_TEXT) $(ZONETABLES)
 LEAP_DEPS=	leapseconds.awk leap-seconds.list
 TZDATA_ZI_DEPS=	ziguard.awk zishrink.awk version $(TDATA) \
@@ -551,7 +588,7 @@ TZDATA_ZI_DEPS=	ziguard.awk zishrink.awk version $(TDATA) \
 DSTDATA_ZI_DEPS= ziguard.awk $(TDATA) $(PACKRATDATA) $(PACKRATLIST)
 DATA=		$(TDATA_TO_CHECK) backzone iso3166.tab leap-seconds.list \
 			leapseconds $(ZONETABLES)
-AWK_SCRIPTS=	checklinks.awk checktab.awk leapseconds.awk \
+AWK_SCRIPTS=	checklinks.awk checknow.awk checktab.awk leapseconds.awk \
 			ziguard.awk zishrink.awk
 MISC=		$(AWK_SCRIPTS)
 TZS_YEAR=	2050
@@ -572,7 +609,7 @@ VERSION_DEPS= \
 		calendars CONTRIBUTING LICENSE Makefile NEWS README SECURITY \
 		africa antarctica asctime.c asia australasia \
 		backward backzone \
-		checklinks.awk checktab.awk \
+		checklinks.awk checknow.awk checktab.awk \
 		date.1 date.c difftime.c \
 		etcetera europe factory iso3166.tab \
 		leap-seconds.list leapseconds.awk localtime.c \
@@ -582,12 +619,7 @@ VERSION_DEPS= \
 		tzfile.5 tzfile.h tzselect.8 tzselect.ksh \
 		workman.sh zdump.8 zdump.c zic.8 zic.c \
 		ziguard.awk zishrink.awk \
-		zone.tab zone1970.tab
-
-# And for the benefit of csh users on systems that assume the user
-# shell should be used to handle commands in Makefiles. . .
-
-SHELL=		/bin/sh
+		zone.tab zone1970.tab zonenow.tab
 
 all:		tzselect zic zdump libtz.a $(TABDATA) \
 		  vanguard.zi main.zi rearguard.zi
@@ -657,6 +689,16 @@ tzdata.zi:	$(DATAFORM).zi version zishrink.awk
 		    $(DATAFORM).zi >$@.out
 		mv $@.out $@
 
+tzdir.h:
+		printf '%s\n' >$@.out \
+		  '#ifndef TZDEFAULT' \
+		  '# define TZDEFAULT "$(TZDEFAULT)" /* default zone */' \
+		  '#endif' \
+		  '#ifndef TZDIR' \
+		  '# define TZDIR "$(TZDIR)" /* TZif directory */' \
+		  '#endif'
+		mv $@.out $@
+
 version.h:	version
 		VERSION=`cat version` && printf '%s\n' \
 		  'static char const PKGVERSION[]="($(PACKAGE)) ";' \
@@ -763,7 +805,7 @@ force_tzs:	$(TZS_NEW)
 
 libtz.a:	$(LIBOBJS)
 		rm -f $@
-		$(AR) -rc $@ $(LIBOBJS)
+		$(AR) $(ARFLAGS) $@ $(LIBOBJS)
 		$(RANLIB) $@
 
 date:		$(DATEOBJS)
@@ -771,26 +813,32 @@ date:		$(DATEOBJS)
 
 tzselect:	tzselect.ksh version
 		VERSION=`cat version` && sed \
-			-e 's|#!/bin/bash|#!$(KSHELL)|g' \
-			-e 's|AWK=[^}]*|AWK='\''$(AWK)'\''|g' \
-			-e 's|\(PKGVERSION\)=.*|\1='\''($(PACKAGE)) '\''|' \
-			-e 's|\(REPORT_BUGS_TO\)=.*|\1=$(BUGEMAIL)|' \
-			-e 's|TZDIR=[^}]*|TZDIR=$(TZDIR)|' \
-			-e 's|\(TZVERSION\)=.*|\1='"$$VERSION"'|' \
-			<$@.ksh >$@.out
+		  -e "s'#!/bin/bash'#!"'$(KSHELL)'\' \
+		  -e s\''\(AWK\)=[^}]*'\''\1=\'\''$(AWK)\'\'\' \
+		  -e s\''\(PKGVERSION\)=.*'\''\1=\'\''($(PACKAGE)) \'\'\' \
+		  -e s\''\(REPORT_BUGS_TO\)=.*'\''\1=\'\''$(BUGEMAIL)\'\'\' \
+		  -e s\''\(TZDIR\)=[^}]*'\''\1=\'\''$(TZDIR)\'\'\' \
+		  -e s\''\(TZVERSION\)=.*'\''\1=\'"'$$VERSION\\''" \
+		  <$@.ksh >$@.out
 		chmod +x $@.out
 		mv $@.out $@
 
 check: check_back check_mild
 check_mild:	check_character_set check_white_space check_links \
-		  check_name_lengths check_slashed_abbrs check_sorted \
+		  check_name_lengths check_now \
+		  check_slashed_abbrs check_sorted \
 		  check_tables check_web check_ziguard check_zishrink check_tzs
 
+# True if UTF8_LOCALE does not work;
+# otherwise, false but with LC_ALL set to $(UTF8_LOCALE).
+UTF8_LOCALE_MISSING = \
+  { test ! '$(UTF8_LOCALE)' \
+    || ! printf 'A\304\200B\n' \
+         | LC_ALL='$(UTF8_LOCALE)' grep -q '^A.B$$' >/dev/null 2>&1 \
+    || { LC_ALL='$(UTF8_LOCALE)'; export LC_ALL; false; }; }
+
 check_character_set: $(ENCHILADA)
-	test ! '$(UTF8_LOCALE)' || \
-	! printf 'A\304\200B\n' | \
-	  LC_ALL='$(UTF8_LOCALE)' grep -q '^A.B$$' >/dev/null 2>&1 || { \
-		LC_ALL='$(UTF8_LOCALE)' && export LC_ALL && \
+	$(UTF8_LOCALE_MISSING) || { \
 		sharp='#' && \
 		! grep -Env $(SAFE_LINE) $(MANS) date.1 $(MANTXTS) \
 			$(MISC) $(SOURCES) $(WEB_PAGES) \
@@ -805,12 +853,12 @@ check_character_set: $(ENCHILADA)
 	touch $@
 
 check_white_space: $(ENCHILADA)
+	$(UTF8_LOCALE_MISSING) || { \
 		patfmt=' \t|[\f\r\v]' && pat=`printf "$$patfmt\\n"` && \
-		! grep -En "$$pat" \
-			$$(ls $(ENCHILADA) | grep -Fvx leap-seconds.list)
-		! grep -n '[$s]$$' \
-			$$(ls $(ENCHILADA) | grep -Fvx leap-seconds.list)
-		touch $@
+		! grep -En "$$pat|[$s]\$$" \
+			$$(ls $(ENCHILADA) | grep -Fvx leap-seconds.list); \
+	}
+	touch $@
 
 PRECEDES_FILE_NAME = ^(Zone|Link[$s]+[^$s]+)[$s]+
 FILE_NAME_COMPONENT_TOO_LONG = $(PRECEDES_FILE_NAME)[^$s]*[^/$s]{15}
@@ -851,7 +899,29 @@ check_links:	checklinks.awk tzdata.zi
 		  -f checklinks.awk tzdata.zi
 		touch $@
 
-check_tables:	checktab.awk $(YDATA) backward $(ZONETABLES)
+# Check timestamps from now through 28 years from now, to make sure
+# that zonenow.tab contains all sequences of planned timestamps,
+# without any duplicate sequences.  In theory this might require
+# 2800 years but that would take a long time to check.
+CHECK_NOW_TIMESTAMP = `./date +%s`
+CHECK_NOW_FUTURE_YEARS = 28
+CHECK_NOW_FUTURE_SECS = $(CHECK_NOW_FUTURE_YEARS) '*' 366 '*' 24 '*' 60 '*' 60
+check_now:	checknow.awk date tzdata.zi zdump zic zone1970.tab zonenow.tab
+		rm -fr $@.dir
+		mkdir $@.dir
+		./zic -d $@.dir tzdata.zi
+		now=$(CHECK_NOW_TIMESTAMP) && \
+		  future=`expr $(CHECK_NOW_FUTURE_SECS) + $$now` && \
+		  ./zdump -i -t $$now,$$future \
+		     $$(find $$PWD/$@.dir/????*/ -type f) \
+		     >$@.dir/zdump.tab
+		$(AWK) \
+		  -v zdump_table=$@.dir/zdump.tab \
+		  -f checknow.awk zonenow.tab
+		rm -fr $@.dir
+		touch $@
+
+check_tables:	checktab.awk $(YDATA) backward zone.tab zone1970.tab
 		for tab in $(ZONETABLES); do \
 		  test "$$tab" = zone.tab && links='$(BACKWARD)' || links=''; \
 		  $(AWK) -f checktab.awk -v zone_table=$$tab $(YDATA) $$links \
@@ -911,10 +981,10 @@ check_zishrink_posix check_zishrink_right: \
 		touch $@
 
 clean_misc:
-		rm -fr check_*.dir
+		rm -fr check_*.dir typecheck_*.dir
 		rm -f *.o *.out $(TIME_T_ALTERNATIVES) \
 		  check_* core typecheck_* \
-		  date tzselect version.h zdump zic libtz.a
+		  date tzdir.h tzselect version.h zdump zic libtz.a
 clean:		clean_misc
 		rm -fr *.dir tzdb-*/
 		rm -f *.zi $(TZS_NEW)
@@ -952,12 +1022,18 @@ $(MANTXTS):	workman.sh
 # plus N if GNU ls and touch are available.
 SET_TIMESTAMP_N = sh -c '\
   n=$$0 dest=$$1; shift; \
-  touch -cmr `ls -t "$$@" | sed 1q` "$$dest" && \
+  <"$$dest" && \
   if test $$n != 0 && \
-     lsout=`ls -n --time-style="+%s" "$$dest" 2>/dev/null`; then \
+     lsout=`ls -nt --time-style="+%s" "$$@" 2>/dev/null`; then \
     set x $$lsout && \
-    touch -cmd @`expr $$7 + $$n` "$$dest"; \
-  else :; fi'
+    timestamp=`expr $$7 + $$n` && \
+    echo "+ touch -md @$$timestamp $$dest" && \
+    touch -md @$$timestamp "$$dest"; \
+  else \
+    newest=`ls -t "$$@" | sed 1q` && \
+    echo "+ touch -mr $$newest $$dest" && \
+    touch -mr "$$newest" "$$dest"; \
+  fi'
 # If DEST depends on A B C ... in this Makefile, callers should use
 # $(SET_TIMESTAMP_DEP) DEST A B C ..., for the benefit of any
 # downstream 'make' that considers equal timestamps to be out of date.
@@ -982,8 +1058,12 @@ set-timestamps.out: $(EIGHT_YARDS)
 		  rm -f test.out && \
 		  for file in $$files; do \
 		    if git diff --quiet $$file; then \
-		      time=`git log -1 --format='tformat:%ct' $$file` && \
-		      touch -cmd @$$time $$file; \
+		      time=`TZ=UTC0 git log -1 \
+			--format='tformat:%cd' \
+			--date='format:%Y-%m-%dT%H:%M:%SZ' \
+			$$file` && \
+		      echo "+ touch -md $$time $$file" && \
+		      touch -md $$time $$file; \
 		    else \
 		      echo >&2 "$$file: warning: does not match repository"; \
 		    fi || exit; \
@@ -1008,7 +1088,8 @@ 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
+		cd public.dir \
+		  && $(MAKE) CFLAGS='$(GCC_DEBUG_FLAGS)' TZDIR='$(TZDIR)' ALL
 		for i in $(TDATA_TO_CHECK) public.dir/tzdata.zi \
 		    public.dir/vanguard.zi public.dir/main.zi \
 		    public.dir/rearguard.zi; \
@@ -1139,7 +1220,7 @@ tzdata$(VERSION)-rearguard.tar.gz: rearguard.zi set-timestamps.out
 		sed '1s/$$/-rearguard/' <version >$@.dir/version
 		: The dummy pacificnew pacifies TZUpdater 2.3.1 and earlier.
 		$(CREATE_EMPTY) $@.dir/pacificnew
-		touch -cmr version $@.dir/version
+		touch -mr version $@.dir/version
 		LC_ALL=C && export LC_ALL && \
 		  (cd $@.dir && \
 		   tar $(TARFLAGS) -cf - \
@@ -1163,7 +1244,7 @@ tzdata$(VERSION)-tailored.tar.gz: set-timestamps.out
 		  `test $(DATAFORM) = vanguard || echo pacificnew`
 		(grep '^#' tzdata.zi && echo && cat $(DATAFORM).zi) \
 		  >$@.dir/etcetera
-		touch -cmr tzdata.zi $@.dir/etcetera
+		touch -mr tzdata.zi $@.dir/etcetera
 		sed -n \
 		  -e '/^# *version  *\(.*\)/h' \
 		  -e '/^# *ddeps  */H' \
@@ -1174,7 +1255,7 @@ tzdata$(VERSION)-tailored.tar.gz: set-timestamps.out
 		  -e 's/ /-/g' \
 		  -e 'p' \
 		  <tzdata.zi >$@.dir/version
-		touch -cmr version $@.dir/version
+		touch -mr version $@.dir/version
 		links= && \
 		  for file in $(TZDATA_DIST); do \
 		    test -f $@.dir/$$file || links="$$links $$file"; \
@@ -1226,10 +1307,10 @@ zonenames:	tzdata.zi
 asctime.o:	private.h tzfile.h
 date.o:		private.h
 difftime.o:	private.h
-localtime.o:	private.h tzfile.h
+localtime.o:	private.h tzfile.h tzdir.h
 strftime.o:	private.h tzfile.h
 zdump.o:	version.h
-zic.o:		private.h tzfile.h version.h
+zic.o:		private.h tzfile.h tzdir.h version.h
 
 .PHONY: ALL INSTALL all
 .PHONY: check check_mild check_time_t_alternatives

NEWS

 News for the tz database
 
+Release 2023d - 2023-12-21 20:02:24 -0800
+
+  Briefly:
+    Ittoqqortoormiit, Greenland changes time zones on 2024-03-31.
+    Vostok, Antarctica changed time zones on 2023-12-18.
+    Casey, Antarctica changed time zones five times since 2020.
+    Code and data fixes for Palestine timestamps starting in 2072.
+    A new data file zonenow.tab for timestamps starting now.
+
+  Changes to future timestamps
+
+    Ittoqqortoormiit, Greenland (America/Scoresbysund) joins most of
+    the rest of Greenland's timekeeping practice on 2024-03-31, by
+    changing its time zone from -01/+00 to -02/-01 at the same moment
+    as the spring-forward transition.  Its clocks will therefore not
+    spring forward as previously scheduled.  The time zone change
+    reverts to its common practice before 1981.
+
+    Fix predictions for DST transitions in Palestine in 2072-2075,
+    correcting a typo introduced in 2023a.
+
+  Changes to past and future timestamps
+
+    Vostok, Antarctica changed to +05 on 2023-12-18.  It had been at
+    +07 (not +06) for years.  (Thanks to Zakhary V. Akulov.)
+
+    Change data for Casey, Antarctica to agree with timeanddate.com,
+    by adding five time zone changes since 2020.  Casey is now at +08
+    instead of +11.
+
+  Changes to past tm_isdst flags
+
+    Much of Greenland, represented by America/Nuuk, changed its
+    standard time from -03 to -02 on 2023-03-25, not on 2023-10-28.
+    This does not affect UTC offsets, only the tm_isdst flag.
+    (Thanks to Thomas M. Steenholdt.)
+
+  New data file
+
+    A new data file zonenow.tab helps configure applications that use
+    timestamps dated from now on.  This simplifies configuration,
+    since users choose from a smaller Zone set.  The file's format is
+    experimental and subject to change.
+
+  Changes to code
+
+    localtime.c no longer mishandles TZif files that contain a single
+    transition into a DST regime.  Previously, it incorrectly assumed
+    DST was in effect before the transition too.  (Thanks to Alois
+    Treindl for debugging help.)
+
+    localtime.c's timeoff no longer collides with OpenBSD 7.4.
+
+    The C code now uses _Generic only if __STDC_VERSION__ says the
+    compiler is C11 or later.
+
+    tzselect now optionally reads zonenow.tab, to simplify when
+    configuring only for timestamps dated from now on.
+
+    tzselect no longer creates temporary files.
+
+    tzselect no longer mishandles the following:
+
+      Spaces and most other special characters in BUGEMAIL, PACKAGE,
+      TZDIR, and VERSION.
+
+      TZ strings when using mawk 1.4.3, which mishandles regular
+      expressions of the form /X{2,}/.
+
+      ISO 6709 coordinates when using an awk that lacks the GNU
+      extension of newlines in -v option-arguments.
+
+      Non UTF-8 locales when using an iconv command that lacks the GNU
+      //TRANSLIT extension.
+
+    zic no longer mishandles data for Palestine after the year 2075.
+    Previously, it incorrectly omitted post-2075 transitions that are
+    predicted for just before and just after Ramadan.  (Thanks to Ken
+    Murchison for debugging help.)
+
+    zic now works again on Linux 2.6.16 and 2.6.17 (2006).
+    (Problem reported by Rune Torgersen.)
+
+  Changes to build procedure
+
+    The Makefile is now more compatible with POSIX:
+     * It no longer defines AR, CC, CFLAGS, LDFLAGS, and SHELL.
+     * It no longer uses its own 'cc' in place of CC.
+     * It now uses ARFLAGS, with default specified by POSIX.
+     * It does not use LFLAGS incompatibly with POSIX.
+     * It uses the special .POSIX target.
+     * It quotes special characters more carefully.
+     * It no longer mishandles builds in an ISO 8859 locale.
+    Due to the CC changes, TZDIR is now #defined in a file tzfile.h
+    built by 'make', not in a $(CC) -D option.  Also, TZDEFAULT is
+    now treated like TZDIR as they have similar roles.
+
+  Changes to commentary
+
+     Limitations and hazards of the optional support for obsolescent
+     C89 platforms are documented better, along with a tentative
+     schedule for removing this support.
+
+
 Release 2023c - 2023-03-28 12:42:14 -0700
 
   Changes to past and future timestamps
@@ -76,11 +180,14 @@ Release 2023a - 2023-03-22 12:39:33 -0700
     platform dependent and abbreviations were silently truncated to
     16 bytes even when the limit was greater than 16.
 
-    The code by default is now designed for C99 or later.  To build in
-    a C89 environment, compile with -DPORT_TO_C89.  To support C89
-    callers of the tzcode library, compile with -DSUPPORT_C89.  The
-    two new macros are transitional aids planned to be removed in a
-    future version, when C99 or later will be required.
+    The code by default is now designed for C99 or later.  To build on
+    a mostly-C89 platform, compile with -DPORT_TO_C89; this should
+    work on C89 platforms that also support C99 'long long' and
+    perhaps a few other extensions to C89.  To support C89 callers of
+    tzcode's library, compile with -DSUPPORT_C89; however, this could
+    trigger latent bugs in C99-or-later callers.  The two new macros
+    are transitional aids planned to be removed in a future version
+    (say, in 2029), when C99 or later will be required.
 
     The code now builds again on pre-C99 platforms, if you compile
     with -DPORT_TO_C89.  This fixes a bug introduced in 2022f.
@@ -723,6 +830,8 @@ Release 2021b - 2021-09-24 16:23:00 -0700
     them, set the EXPIRES_LINE Makefile variable.  If a TZif file uses
     this new feature it is marked with a new TZif version number 4,
     a format intended to be documented in a successor to RFC 8536.
+    The old-format "#expires" comments are now treated solely as
+    comments and have no effect on the TZif files.
 
     zic -L LEAPFILE -r @LO no longer generates an invalid TZif file
     that omits leap second information for the range LO..B when LO
@@ -4302,7 +4411,7 @@ Release 2012j - 2012-11-12 18:34:49 -0800
   now uses tz@iana.org rather than the old elsie address.
 
   zic -v now complains about abbreviations that are less than 3
-  or more than 6 characters, as per Posix.  Formerly, it checked
+  or more than 6 characters, as per POSIX.  Formerly, it checked
   for abbreviations that were more than 3.
 
   'make public' no longer puts its temporary directory under /tmp,
@@ -4467,8 +4576,8 @@ Release data2011m - 2011-10-24 21:42:16 +0700
   In particular, the typos in comments in the data (2011-11-17 should have
   been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
   Tim Parenti noted) have been fixed, and the change for Ukraine has been
-  made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
-  Tim Parenti, and also Denys Gavrysh)
+  made in all 4 Ukrainian zones, rather than just Europe/Kiev
+  (again, thanks to Tim Parenti, and also Denys Gavrysh).
 
   In addition, I added Europe/Tiraspol to zone.tab.
 

README

@@ -11,14 +11,17 @@ changes made by political bodies to time zone boundaries, UTC offsets,
 and daylight-saving rules.
 
 See <https://www.iana.org/time-zones/repository/tz-link.html> or the
-file tz-link.html for how to acquire the code and data.  Once acquired,
-read the comments in the file 'Makefile' and make any changes needed
-to make things right for your system, especially if you are using some
-platform other than GNU/Linux.  Then run the following commands,
-substituting your desired installation directory for "$HOME/tzdir":
-
-	make TOPDIR=$HOME/tzdir install
-	$HOME/tzdir/usr/bin/zdump -v America/Los_Angeles
+file tz-link.html for how to acquire the code and data.
+
+Once acquired, read the leading comments in the file "Makefile"
+and make any changes needed to make things right for your system,
+especially when using a platform other than current GNU/Linux.
+
+Then run the following commands, substituting your desired
+installation directory for "$HOME/tzdir":
+
+	make TOPDIR="$HOME/tzdir" install
+	"$HOME/tzdir/usr/bin/zdump" -v America/Los_Angeles
 
 See the file tz-how-to.html for examples of how to read the data files.
 

africa

@@ -285,13 +285,6 @@ Rule	Egypt	2007	only	-	Sep	Thu>=1	24:00	0	-
 # reproduced by other (more accessible) sites[, e.g.,]...
 # http://elgornal.net/news/news.aspx?id=4699258
 
-# From Paul Eggert (2014-06-04):
-# Sarah El Deeb and Lee Keath of AP report that the Egyptian government says
-# the change is because of blackouts in Cairo, even though Ahram Online (cited
-# above) says DST had no affect on electricity consumption.  There is
-# no information about when DST will end this fall.  See:
-# http://abcnews.go.com/International/wireStory/el-sissi-pushes-egyptians-line-23614833
-
 # From Steffen Thorsen (2015-04-08):
 # Egypt will start DST on midnight after Thursday, April 30, 2015.
 # This is based on a law (no 35) from May 15, 2014 saying it starts the last

antarctica

@@ -80,6 +80,11 @@
 # - 2018 Oct  7 4:00 - 2019 Mar 17 3:00 - 2019 Oct  4 3:00 - 2020 Mar  8 3:00
 # and now - 2020 Oct  4 0:01
 
+# From Paul Eggert (2023-12-20):
+# Transitions from 2021 on are taken from:
+# https://www.timeanddate.com/time/zone/antarctica/casey
+# retrieved at various dates.
+
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone Antarctica/Casey	 0	-	-00	1969
 			 8:00	-	+08	2009 Oct 18  2:00
@@ -93,7 +98,12 @@ Zone Antarctica/Casey	 0	-	-00	1969
 			 8:00	-	+08	2019 Oct  4  3:00
 			11:00	-	+11	2020 Mar  8  3:00
 			 8:00	-	+08	2020 Oct  4  0:01
-			11:00	-	+11
+			11:00	-	+11	2021 Mar 14  0:00
+			 8:00	-	+08	2021 Oct  3  0:01
+			11:00	-	+11	2022 Mar 13  0:00
+			 8:00	-	+08	2022 Oct  2  0:01
+			11:00	-	+11	2023 Mar  9  3:00
+			 8:00	-	+08
 Zone Antarctica/Davis	0	-	-00	1957 Jan 13
 			7:00	-	+07	1964 Nov
 			0	-	-00	1969 Feb
@@ -240,7 +250,50 @@ Zone Antarctica/Troll	0	-	-00	2005 Feb 12
 #	year-round from 1960/61 to 1992
 
 # Vostok, since 1957-12-16, temporarily closed 1994-02/1994-11
-# See Asia/Urumqi.
+# From Craig Mundell (1994-12-15):
+# http://quest.arc.nasa.gov/antarctica/QA/computers/Directions,Time,ZIP
+# Vostok, which is one of the Russian stations, is set on the same
+# time as Moscow, Russia.
+#
+# From Lee Hotz (2001-03-08):
+# I queried the folks at Columbia who spent the summer at Vostok and this is
+# what they had to say about time there:
+# "in the US Camp (East Camp) we have been on New Zealand (McMurdo)
+# time, which is 12 hours ahead of GMT. The Russian Station Vostok was
+# 6 hours behind that (although only 2 miles away, i.e. 6 hours ahead
+# of GMT). This is a time zone I think two hours east of Moscow. The
+# natural time zone is in between the two: 8 hours ahead of GMT."
+#
+# From Paul Eggert (2001-05-04):
+# This seems to be hopelessly confusing, so I asked Lee Hotz about it
+# in person.  He said that some Antarctic locations set their local
+# time so that noon is the warmest part of the day, and that this
+# changes during the year and does not necessarily correspond to mean
+# solar noon.  So the Vostok time might have been whatever the clocks
+# happened to be during their visit.  So we still don't really know what time
+# it is at Vostok.
+#
+# From Zakhary V. Akulov (2023-12-17 22:00:48 +0700):
+# ... from December, 18, 2023 00:00 by my decision the local time of
+# the Antarctic research base Vostok will correspond to UTC+5.
+# (2023-12-19): We constantly interact with Progress base, with company who
+# builds new wintering station, with sledge convoys, with aviation - they all
+# use UTC+5. Besides, difference between Moscow time is just 2 hours now, not 4.
+# (2023-12-19, in response to the question "Has local time at Vostok
+# been UTC+6 ever since 1957, or has it changed before?"): No. At least
+# since my antarctic career start, 10 years ago, Vostok base has UTC+7.
+# (In response to a 2023-12-18 question "from 02:00 to 00:00 today"): This.
+#
+# From Paul Eggert (2023-12-18):
+# For lack of better info, guess Vostok was at +07 from founding through today,
+# except when closed.
+
+# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
+Zone Antarctica/Vostok	0	-	-00	1957 Dec 16
+			7:00	-	+07	1994 Feb
+			0	-	-00	1994 Nov
+			7:00	-	+07	2023 Dec 18  2:00
+			5:00	-	+05
 
 # S Africa - year-round bases
 # Marion Island, -4653+03752

asia

@@ -655,7 +655,6 @@ Zone	Asia/Shanghai	8:05:43	-	LMT	1901
 			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.)
-# Vostok base in Antarctica matches this since 1970.
 Zone	Asia/Urumqi	5:50:20	-	LMT	1928
 			6:00	-	+06
 
@@ -3427,6 +3426,9 @@ Zone	Asia/Karachi	4:28:12 -	LMT	1907
 # From Heba Hamad (2023-03-22):
 # ... summer time will begin in Palestine from Saturday 04-29-2023,
 # 02:00 AM by 60 minutes forward.
+# From Heba Hemad (2023-10-09):
+# ... winter time will begin in Palestine from Saturday 10-28-2023,
+# 02:00 AM by 60 minutes back.
 #
 # From Paul Eggert (2023-03-22):
 # For now, guess that spring and fall transitions will normally
@@ -3548,13 +3550,13 @@ Rule Palestine	2070	only	-	Oct	 4	2:00	0	-
 Rule Palestine	2071	only	-	Sep	19	2:00	0	-
 Rule Palestine	2072	only	-	Sep	10	2:00	0	-
 Rule Palestine	2072	only	-	Oct	15	2:00	1:00	S
+Rule Palestine	2072	max	-	Oct	Sat<=30	2:00	0	-
 Rule Palestine	2073	only	-	Sep	 2	2:00	0	-
 Rule Palestine	2073	only	-	Oct	 7	2:00	1:00	S
 Rule Palestine	2074	only	-	Aug	18	2:00	0	-
 Rule Palestine	2074	only	-	Sep	29	2:00	1:00	S
 Rule Palestine	2075	only	-	Aug	10	2:00	0	-
 Rule Palestine	2075	only	-	Sep	14	2:00	1:00	S
-Rule Palestine	2075	max	-	Oct	Sat<=30	2:00	0	-
 Rule Palestine	2076	only	-	Jul	25	2:00	0	-
 Rule Palestine	2076	only	-	Sep	 5	2:00	1:00	S
 Rule Palestine	2077	only	-	Jul	17	2:00	0	-

australasia

@@ -391,8 +391,14 @@ Zone Antarctica/Macquarie 0	-	-00	1899 Nov
 # Please note that there will not be any daylight savings time change
 # in Fiji for 2022-2023....
 # https://www.facebook.com/FijianGovernment/posts/pfbid0mmWVTYmTibn66ybpFda75pDcf34SSpoSaskJW5gXwaKo5Sgc7273Q4fXWc6kQV6Hl
+
+# From Almaz Mingaleev (2023-10-06):
+# Cabinet approved the suspension of Daylight Saving and appropriate
+# legislative changes will be considered including the repeal of the
+# Daylight Saving Act 1998
+# https://www.fiji.gov.fj/Media-Centre/Speeches/English/CABINET-DECISIONS-3-OCTOBER-2023
 #
-# From Paul Eggert (2022-10-27):
+# From Paul Eggert (2023-10-06):
 # For now, assume DST is suspended indefinitely.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S

backward

@@ -205,7 +205,6 @@ Link	America/Puerto_Rico	America/Tortola
 Link	Pacific/Port_Moresby	Antarctica/DumontDUrville
 Link	Pacific/Auckland	Antarctica/McMurdo
 Link	Asia/Riyadh		Antarctica/Syowa
-Link	Asia/Urumqi		Antarctica/Vostok
 Link	Europe/Berlin		Arctic/Longyearbyen
 Link	Asia/Riyadh		Asia/Aden
 Link	Asia/Qatar		Asia/Bahrain

backzone

@@ -963,35 +963,6 @@ Link Antarctica/McMurdo Antarctica/South_Pole
 Zone Antarctica/Syowa	0	-	-00	1957 Jan 29
 			3:00	-	+03
 
-# Vostok, Antarctica
-#
-# Vostok, since 1957-12-16, temporarily closed 1994-02/1994-11
-# From Craig Mundell (1994-12-15):
-# http://quest.arc.nasa.gov/antarctica/QA/computers/Directions,Time,ZIP
-# Vostok, which is one of the Russian stations, is set on the same
-# time as Moscow, Russia.
-#
-# From Lee Hotz (2001-03-08):
-# I queried the folks at Columbia who spent the summer at Vostok and this is
-# what they had to say about time there:
-# "in the US Camp (East Camp) we have been on New Zealand (McMurdo)
-# time, which is 12 hours ahead of GMT. The Russian Station Vostok was
-# 6 hours behind that (although only 2 miles away, i.e. 6 hours ahead
-# of GMT). This is a time zone I think two hours east of Moscow. The
-# natural time zone is in between the two: 8 hours ahead of GMT."
-#
-# From Paul Eggert (2001-05-04):
-# This seems to be hopelessly confusing, so I asked Lee Hotz about it
-# in person.  He said that some Antarctic locations set their local
-# time so that noon is the warmest part of the day, and that this
-# changes during the year and does not necessarily correspond to mean
-# solar noon.  So the Vostok time might have been whatever the clocks
-# happened to be during their visit.  So we still don't really know what time
-# it is at Vostok.  But we'll guess +06.
-#
-Zone Antarctica/Vostok	0	-	-00	1957 Dec 16
-			6:00	-	+06
-
 # Yemen
 # Milne says 2:59:54 was the meridian of the saluting battery at Aden,
 # and that Yemen was at 1:55:56, the meridian of the Hagia Sophia.

checknow.awk

+# Check zonenow.tab for consistency with primary data.
+
+# Contributed by Paul Eggert.  This file is in the public domain.
+
+function record_zone(zone, data) {
+  if (zone) {
+    zone_data[zone] = data
+    zones[data] = zones[data] " " zone
+  }
+}
+
+BEGIN {
+  while (getline <zdump_table) {
+    if ($0 ~ /^TZ/) {
+      record_zone(zone, data)
+      zone = $0
+      sub(/.*\.dir\//, "", zone)
+      sub(/\/\//, "/", zone)
+      sub(/"/, "", zone)
+      data = ""
+    } else if ($0 ~ /./)
+      data = data $0 "\n"
+  }
+  record_zone(zone, data)
+  FS = "\t"
+}
+
+/^[^#]/ {
+  zone = $3
+  data = zone_data[zone]
+  if (!data) {
+    printf "%s: no data\n", zone
+    status = 1
+  } else {
+    zone2 = zonenow[data]
+    if (zone2) {
+      printf "zones %s and %s identical from now on\n", zone, zone2
+      status = 1
+    } else
+      zonenow[data] = zone
+  }
+}
+
+END {
+ for (zone in zone_data) {
+    data = zone_data[zone]
+    if (!zonenow[data]) {
+      printf "checknow.tab should have one of:%s\n", zones[data]
+      zonenow[data] = zone # This suppresses duplicate diagnostics.
+      status = 1
+    }
+ }
+ exit status
+}

checktab.awk

@@ -83,7 +83,7 @@ BEGIN {
 		    cc = cca[i]
 		    if (cc2name[cc]) {
 			cc_used[cc]++
-		    } else {
+		    } else if (! (cc == "XX" && zone_table == "zonenow.tab")) {
 			printf "%s:%d: %s: unknown country code\n", \
 				zone_table, zone_NR, cc >>"/dev/stderr"
 			status = 1
@@ -110,7 +110,7 @@ BEGIN {
 	      used_max_cc = cc
 	    }
 	  }
-	  if (used_max <= 1 && comments) {
+	  if (used_max <= 1 && comments && zone_table != "zonenow.tab") {
 	    printf "%s:%d: unnecessary comment '%s'\n", \
 	      zone_table, i, comments \
 	      >>"/dev/stderr"
@@ -149,7 +149,8 @@ $1 ~ /^#/ { next }
 		if ($3 ~ /%/) rulePercentUsed[$2] = 1
 	}
 	if (tz && tz ~ /\// && tz !~ /^Etc\//) {
-		if (!tztab[tz] && FILENAME != "backward") {
+		if (!tztab[tz] && FILENAME != "backward" \
+		    && zone_table != "zonenow.tab") {
 			printf "%s: no data for '%s'\n", zone_table, tz \
 				>>"/dev/stderr"
 			status = 1

debian/changelog

+tzdata (2023d-0+deb12u1) bookworm; urgency=medium
+
+  * New upstream version:
+    - Ittoqqortoormiit, Greenland changes time zones on 2024-03-31.
+    - Vostok, Antarctica changed time zones on 2023-12-18.
+    - Casey, Antarctica changed time zones five times since 2020.
+    - Code and data fixes for Palestine timestamps starting in 2072.
+  * Drop leap-seconds.list patch (taken from upstream)
+
+ -- Aurelien Jarno <aurel32@debian.org>  Thu, 25 Jan 2024 22:09:03 +0100
+
 tzdata (2023c-5+deb12u1) bookworm; urgency=medium
 
   * Update leap-seconds.list from upstream

debian/patches/01-no-leap-second-on-2023-12-31.patch

-From c3e966c59b02b1f47f0b7b0e4aa6a86563c07062 Mon Sep 17 00:00:00 2001
-From: Tim Parenti <tim@timtimeonline.com>
-Date: Mon, 14 Aug 2023 15:29:57 -0400
-Subject: [PATCH] No leap second on 2023-12-31
-
-Per IERS Bulletin C 66 (2023-07-04).
-https://hpiers.obspm.fr/iers/bul/bulc/bulletinc.66
-
-* leap-seconds.list: Update file from NIST, retrieved from
-ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list
----
- leap-seconds.list | 8 ++++----
- 1 file changed, 4 insertions(+), 4 deletions(-)
-
-diff --git a/leap-seconds.list b/leap-seconds.list
-index 17e3a100..3fe9a121 100644
---- a/leap-seconds.list
-+++ b/leap-seconds.list
-@@ -204,10 +204,10 @@
- #	current -- the update time stamp, the data and the name of the file
- #	will not change.
- #
--#	Updated through IERS Bulletin C65
--#	File expires on:  28 December 2023
-+#	Updated through IERS Bulletin C66
-+#	File expires on:  28 June 2024
- #
--#@	3912710400
-+#@	3928521600
- #
- 2272060800	10	# 1 Jan 1972
- 2287785600	11	# 1 Jul 1972
-@@ -252,4 +252,4 @@
- #	the hash line is also ignored in the
- #	computation.
- #
--#h 	e76a99dc 65f15cc7 e613e040 f5078b5e b23834fe
-+#h 	16edd0f0 3666784f 37db6bdd e74ced87 59af48f1
--- 
-2.42.0
-

debian/patches/series

-01-no-leap-second-on-2023-12-31.patch

europe

@@ -1123,6 +1123,23 @@ Zone Atlantic/Faroe	-0:27:04 -	LMT	1908 Jan 11 # Tórshavn
 # 2. The shift *from* DST in 2023 happens as normal, but coincides with the
 #    shift to UTC-02 normaltime (people will not change their clocks here).
 # 3. After this, DST is still observed, but as -02/-01 instead of -03/-02.
+#
+# From Múte Bourup Egede via Jógvan Svabo Samuelsen (2023-03-15):
+# Greenland will not switch to Daylight Saving Time this year, 2023,
+# because the standard time for Greenland will change from UTC -3 to UTC -2.
+# However, Greenland will change to Daylight Saving Time again in 2024
+# and onwards.
+
+# From a contributor who wishes to remain anonymous for now (2023-10-29):
+# https://www.dr.dk/nyheder/seneste/i-nat-skal-uret-stilles-en-time-tilbage-men-foerste-gang-sker-det-ikke-i-groenland
+# with a link to that page:
+# https://naalakkersuisut.gl/Nyheder/2023/10/2710_sommertid
+# ... Ittoqqortoormiit joins the time of Nuuk at March 2024.
+# What would mean that America/Scoresbysund would either be in -01 year round
+# or in -02/-01 like America/Nuuk, but no longer in -01/+00.
+#
+# From Paul Eggert (2023-10-29):
+# For now, assume it will be like America/Nuuk.
 
 # Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Thule	1991	1992	-	Mar	lastSun	2:00	1:00	D
@@ -1143,10 +1160,12 @@ Zone America/Danmarkshavn -1:14:40 -	LMT	1916 Jul 28
 Zone America/Scoresbysund -1:27:52 -	LMT	1916 Jul 28 # Ittoqqortoormiit
 			-2:00	-	-02	1980 Apr  6  2:00
 			-2:00	C-Eur	-02/-01	1981 Mar 29
-			-1:00	EU	-01/+00
+			-1:00	EU	-01/+00 2024 Mar 31
+			-2:00	EU	-02/-01
 Zone America/Nuuk	-3:26:56 -	LMT	1916 Jul 28 # Godthåb
 			-3:00	-	-03	1980 Apr  6  2:00
-			-3:00	EU	-03/-02	2023 Oct 29  1:00u
+			-3:00	EU	-03/-02	2023 Mar 26  1:00u
+			-2:00	-	-02	2023 Oct 29  1:00u
 			-2:00	EU	-02/-01
 Zone America/Thule	-4:35:08 -	LMT	1916 Jul 28 # Pituffik
 			-4:00	Thule	A%sT
@@ -3711,11 +3730,7 @@ Zone	Europe/Istanbul	1:55:52 -	LMT	1880
 # and not at 3:00 as would have been under EU rules.
 # This is why I have set the change to EU rules into May 1996,
 # so that the change in March is stil covered by the Ukraine rule.
-# The next change in October 1996 happened under EU rules....
-# TZ database holds three other zones for Ukraine.... I have not yet
-# worked out the consequences for these three zones, as we (me and my
-# US colleague David Cochrane) are still trying to get more
-# information upon these local deviations from Kiev rules.
+# The next change in October 1996 happened under EU rules.
 #
 # From Paul Eggert (2022-08-27):
 # For now, assume that Ukraine's zones all followed the same rules,

iso3166.tab

@@ -3,17 +3,22 @@
 # This file is in the public domain, so clarified as of
 # 2009-05-17 by Arthur David Olson.
 #
-# From Paul Eggert (2022-11-18):
+# From Paul Eggert (2023-09-06):
 # This file contains a table of two-letter country codes.  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.  ISO 3166-1 alpha-2 country code, current as of
-#     ISO 3166-1 N1087 (2022-09-02).  See: Updates on ISO 3166-1
-#     https://isotc.iso.org/livelink/livelink/Open/16944257
-# 2.  The usual English name for the coded region,
-#     chosen so that alphabetic sorting of subsets produces helpful lists.
-#     This is not the same as the English name in the ISO 3166 tables.
+#     ISO/TC 46 N1108 (2023-04-05).  See: ISO/TC 46 Documents
+#     https://www.iso.org/committee/48750.html?view=documents
+# 2.  The usual English name for the coded region.  This sometimes
+#     departs from ISO-listed names, sometimes so that sorted subsets
+#     of names are useful (e.g., "Samoa (American)" and "Samoa
+#     (western)" rather than "American Samoa" and "Samoa"),
+#     sometimes to avoid confusion among non-experts (e.g.,
+#     "Czech Republic" and "Turkey" rather than "Czechia" and "Türkiye"),
+#     and sometimes to omit needless detail or churn (e.g., "Netherlands"
+#     rather than "Netherlands (the)" or "Netherlands (Kingdom of the)").
 #
 # The table is sorted by country code.
 #

leap-seconds.list

@@ -204,10 +204,10 @@
 #	current -- the update time stamp, the data and the name of the file
 #	will not change.
 #
-#	Updated through IERS Bulletin C65
-#	File expires on:  28 December 2023
+#	Updated through IERS Bulletin C66
+#	File expires on:  28 June 2024
 #
-#@	3912710400
+#@	3928521600
 #
 2272060800	10	# 1 Jan 1972
 2287785600	11	# 1 Jul 1972
@@ -252,4 +252,4 @@
 #	the hash line is also ignored in the
 #	computation.
 #
-#h 	e76a99dc 65f15cc7 e613e040 f5078b5e b23834fe
+#h 	16edd0f0 3666784f 37db6bdd e74ced87 59af48f1

leapseconds

@@ -72,11 +72,11 @@ Leap	2016	Dec	31	23:59:60	+	S
 # Any additional leap seconds will come after this.
 # This Expires line is commented out for now,
 # so that pre-2020a zic implementations do not reject this file.
-#Expires 2023	Dec	28	00:00:00
+#Expires 2024	Jun	28	00:00:00
 
 # POSIX timestamps for the data in this file:
 #updated 1467936000 (2016-07-08 00:00:00 UTC)
-#expires 1703721600 (2023-12-28 00:00:00 UTC)
+#expires 1719532800 (2024-06-28 00:00:00 UTC)
 
-#	Updated through IERS Bulletin C65
-#	File expires on:  28 December 2023
+#	Updated through IERS Bulletin C66
+#	File expires on:  28 June 2024

northamerica

@@ -1453,7 +1453,7 @@ Rule	StJohns	1989	2006	-	Apr	Sun>=1	0:01	1:00	D
 Rule	StJohns	2007	2011	-	Mar	Sun>=8	0:01	1:00	D
 Rule	StJohns	2007	2010	-	Nov	Sun>=1	0:01	0	S
 #
-# St John's has an apostrophe, but Posix file names can't have apostrophes.
+# St John's has an apostrophe, but POSIX file names can't have apostrophes.
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
 Zone America/St_Johns	-3:30:52 -	LMT	1884
 			-3:30:52 StJohns N%sT	1918

southamerica

@@ -1697,6 +1697,12 @@ Rule	Para	2010	2012	-	Apr	Sun>=8	0:00	0	-
 # From Carlos Raúl Perasso (2014-02-28):
 # Decree 1264 can be found at:
 # http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf
+#
+# From Paul Eggert (2023-07-26):
+# Transition dates are now set by Law No. 7115, not by presidential decree.
+# https://www.abc.com.py/politica/2023/07/12/promulgacion-el-cambio-de-hora-sera-por-ley/
+# From Carlos Raúl Perasso (2023-07-27):
+# http://silpy.congreso.gov.py/descarga/ley-144138
 Rule	Para	2013	max	-	Mar	Sun>=22	0:00	0	-
 
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]