[tz] [PROPOSED 18/18] New tzselection option ‘now’

Dec. 19, 2023

* Makefile (ZONETABLES, VERSION_DEPS): Add zonenow.tab.
(CHECK_NOW_TIMESTAMP, CHECK_NOW_FUTURE_YEARS, CHECK_NOW_FUTURE_SECS):
New macros.
(check_now): New target rule.
(check_mild): Depend on it.
* NEWS: Mention this new feature.
* checknow.awk, zonenow.tab: New files.
* checktab.awk: Adjust (i.e., loosen) checks for zonenow.tab.
* tzselect.ksh (TZ_ZONETABTYPE_TABLE, TZ_ZONENOW_TABLE):
New vars, so that the code can switch back and for easily between
zone1970.tab and zonenow.tab.
(TZ_ZONE_TABLE): Set to one of those two vars, depending on user.
Let users choose ‘now’ if they care only about timestamps from now on.
Narrow ‘regions’ based on ‘now’ selection, if possible (which it
always is, with the current data).
---
 Makefile     |  31 +++++-
 NEWS         |  11 ++
 checknow.awk |  53 +++++++++
 checktab.awk |   7 +-
 tzselect.ksh |  49 +++++++--
 zonenow.tab  | 298 +++++++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 435 insertions(+), 14 deletions(-)
 create mode 100644 checknow.awk
 create mode 100644 zonenow.tab

diff --git a/Makefile b/Makefile
index a6051531..f473af67 100644
--- a/Makefile
+++ b/Makefile
@@ -580,7 +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) \
@@ -619,7 +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
+		zone.tab zone1970.tab zonenow.tab
 
 all:		tzselect zic zdump libtz.a $(TABDATA) \
 		  vanguard.zi main.zi rearguard.zi
@@ -825,7 +825,8 @@ tzselect:	tzselect.ksh version
 
 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
 
 check_character_set: $(ENCHILADA)
@@ -893,7 +894,29 @@ 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 \
diff --git a/NEWS b/NEWS
index f2d0bc3c..43070aae 100644
--- a/NEWS
+++ b/NEWS
@@ -5,6 +5,7 @@ Unreleased, experimental changes
   Briefly:
     Ittoqqortoormiit, Greenland changes time zones on 2024-03-31.
     Code and data fixes for Palestine timestamps starting in 2072.
+    A new data file zonenow.tab for timestamps starting now.
 
   Changes to future timestamps
 
@@ -25,6 +26,13 @@ Unreleased, experimental changes
     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
@@ -32,6 +40,9 @@ Unreleased, experimental changes
     DST was in effect before the transition too.  (Thanks to Alois
     Treindl for debugging help.)
 
+    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:
diff --git a/checknow.awk b/checknow.awk
new file mode 100644
index 00000000..51ee998f
--- /dev/null
+++ b/checknow.awk
@@ -0,0 +1,53 @@
+# 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)
+      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"
+    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
+}
diff --git a/checktab.awk b/checktab.awk
index 2dbf485f..9a26e465 100644
--- a/checktab.awk
+++ b/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[$2] = 1
 	}
 	if (tz && tz ~ /\// && tz !~ /^Etc\//) {
-		if (!tztab[tz] && FILENAME != "backward") {
+		if (!tztab[tz] && FILENAME != "backward" \
+		    && zone_table != "zonenow.tab") {
 			printf "%s: no data for '%s'\n", zone_table, tz \
 				>>"/dev/stderr"
 			status = 1
diff --git a/tzselect.ksh b/tzselect.ksh
index f894bb56..70bda9c0 100644
--- a/tzselect.ksh
+++ b/tzselect.ksh
@@ -196,7 +196,8 @@ read_file() {
   }
 }
 read_file TZ_COUNTRY_TABLE "$TZDIR/iso3166.tab"
-read_file TZ_ZONE_TABLE "$TZDIR/$zonetabtype.tab"
+read_file TZ_ZONETABTYPE_TABLE "$TZDIR/$zonetabtype.tab"
+TZ_ZONENOW_TABLE=
 
 newline='
 '
@@ -385,6 +386,7 @@ while
   country_result=
   region=
   time=
+  TZ_ZONE_TABLE=$TZ_ZONETABTYPE_TABLE
 
   case $coord in
   ?*)
@@ -393,7 +395,8 @@ while
 
     # Ask the user for continent or ocean.
 
-    echo >&2 'Please select a continent, ocean, "coord", "TZ", or "time".'
+    echo >&2 \
+      'Please select a continent, ocean, "coord", "TZ", "time", or "now".'
 
     quoted_continents=`
       $AWK '
@@ -406,10 +409,10 @@ while
 	  printf "'\''%s'\''\n", entry
 	}
 	BEGIN {
-	  TZ_ZONE_TABLE = substr(ARGV[1], 2)
+	  TZ_ZONETABTYPE_TABLE = substr(ARGV[1], 2)
 	  ARGV[1] = ""
 	  FS = "\t"
-	  nlines = split(TZ_ZONE_TABLE, line, /\n/)
+	  nlines = split(TZ_ZONETABTYPE_TABLE, line, /\n/)
 	  for (i = 1; i <= nlines; i++) {
 	    $0 = line[i]
 	    if ($0 ~ /^[^#]/)
@@ -421,7 +424,7 @@ while
 	    }
 	  }
 	}
-      ' ="$TZ_ZONE_TABLE" |
+      ' ="$TZ_ZONETABTYPE_TABLE" |
       sort -u |
       tr '\n' ' '
       echo ''
@@ -431,12 +434,19 @@ while
       doselect '"$quoted_continents"' \
 	"coord - I want to use geographical coordinates." \
 	"TZ - I want to specify the timezone using the POSIX TZ format." \
-	"time - I know local time already."
+	"time - I know local time already." \
+	"now - Like \"time\", but configure only for timestamps from now on."
       continent=$select_result
       case $continent in
       Americas) continent=America;;
       *" "*)    continent=`expr "$continent" : '\''\([^ ]*\)'\''`
       esac
+      case $zonetabtype,$continent in
+      zonenow,*) ;;
+      *,now)
+	${TZ_ZONENOW_TABLE:+:} read_file TZ_ZONENOW_TABLE "$TZDIR/zonenow.tab"
+	TZ_ZONE_TABLE=$TZ_ZONENOW_TABLE
+      esac
     '
   esac
 
@@ -529,7 +539,7 @@ while
       `;;
     *)
       case $continent in
-      time)
+      now|time)
 	minute_format='%a %b %d %H:%M'
 	old_minute=`TZ=UTC0 date +"$minute_format"`
 	for i in 1 2 3
@@ -609,6 +619,31 @@ while
 	  ="$continent_re" ="$TZ_COUNTRY_TABLE" ="$zone_table" |
 	sort -f
       `
+      # If all zone table entries have comments, and there are
+      # at most 22 entries, asked based on those comments.
+      # This fits the prompt onto old-fashioned 24-line screens.
+      regions=`
+	$AWK '
+	  BEGIN {
+	    TZ_ZONE_TABLE = substr(ARGV[1], 2)
+	    ARGV[1] = ""
+	    FS = "\t"
+	    nlines = split(TZ_ZONE_TABLE, line, /\n/)
+	    for (i = 1; i <= nlines; i++) {
+	      $0 = line[i]
+	      if ($0 ~ /^[^#]/ && !missing_comment) {
+		if ($4)
+		  comment[++inlines] = $4
+		else
+		  missing_comment = 1
+	      }
+	    }
+	    if (!missing_comment && inlines <= 22)
+	      for (i = 1; i <= inlines; i++)
+		print comment[i]
+	  }
+	' ="$zone_table"
+      `
 
       # If there's more than one country, ask the user which one.
       case $countries in
diff --git a/zonenow.tab b/zonenow.tab
new file mode 100644
index 00000000..b1c1f332
--- /dev/null
+++ b/zonenow.tab
@@ -0,0 +1,298 @@
+# tzdb timezone descriptions, for users who do not care about old timestamps
+#
+# This file is in the public domain.
+#
+# From Paul Eggert (2023-12-18):
+# This file contains a table where each row stands for a timezone
+# where civil timestamps are predicted to agree from now on.
+# This file is like zone1970.tab (see zone1970.tab's coments),
+# but with the following changes:
+#
+# 1.  Each timezone corresponds to a set of clocks that are planned
+#     to agree from now on.  This is a larger set of clocks than in
+#     zone1970.tab, where each timezone's clocks must agree from 1970 on.
+# 2.  The first column is irrelevant and ignored.
+# 3.  The table is sorted in a different way:
+#     first by standard time UTC offset;
+#     then, if DST is used, by daylight saving UTC offset;
+#     then by time zone abbreviation.
+#
+# The format of this table is experimental, and may change in future versions.
+#
+# 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.
+#
+#XX	coordinates	TZ	comments
+#
+# -11 - SST
+XX	-1416-17042	Pacific/Pago_Pago	Midway; Samoa ("SST")
+#
+# -11
+XX	-1901-16955	Pacific/Niue	Niue
+#
+# -10 - HST
+XX	+211825-1575130	Pacific/Honolulu	Hawaii ("HST")
+#
+# -10
+XX	-1732-14934	Pacific/Tahiti	Tahiti; Cook Islands
+#
+# -10/-09 - HST / HDT (North America DST)
+XX	+515248-1763929	America/Adak	western Aleutians in Alaska ("HST/HDT")
+#
+# -09:30
+XX	-0900-13930	Pacific/Marquesas	Marquesas
+#
+# -09
+XX	-2308-13457	Pacific/Gambier	Gambier
+#
+# -09/-08 - AKST/AKDT (North America DST)
+XX	+611305-1495401	America/Anchorage	most of Alaska ("AKST/AKDT")
+#
+# -08
+XX	-2504-13005	Pacific/Pitcairn	Pitcairn
+#
+# -08/-07 - PST/PDT (North America DST)
+XX	+340308-1181434	America/Los_Angeles	Pacific ("PST/PDT") - US & Canada; Mexico near US border
+#
+# -07 - MST
+XX	+332654-1120424	America/Phoenix	Mountain Standard ("MST") - Arizona; western Mexico; Yukon
+#
+# -07/-06 - MST/MDT (North America DST)
+XX	+394421-1045903	America/Denver	Mountain ("MST/MDT") - US & Canada; Mexico near US border
+#
+# -06
+XX	-0054-08936	Pacific/Galapagos	Galápagos
+#
+# -06 - CST
+XX	+1924-09909	America/Mexico_City	Central Standard ("CST") - Saskatchewan; central Mexico; Central America
+#
+# -06/-05 (Chile DST)
+XX	-2709-10926	Pacific/Easter	Easter Island
+#
+# -06/-05 - CST/CDT (North America DST)
+XX	+415100-0873900	America/Chicago	Central ("CST/CDT") - US & Canada; Mexico near US border
+#
+# -05
+XX	-1203-07703	America/Lima	eastern South America
+#
+# -05 - EST
+XX	+175805-0764736	America/Jamaica	Eastern Standard ("EST") - Caymans; Jamaica; eastern Mexico; Panama
+#
+# -05/-04 - CST/CDT (Cuba DST)
+XX	+2308-08222	America/Havana	Cuba
+#
+# -05/-04 - EST/EDT (North America DST)
+XX	+404251-0740023	America/New_York	Eastern ("EST/EDT") - US & Canada
+#
+# -04
+XX	+1030-06656	America/Caracas	western South America
+#
+# -04 - AST
+XX	+1828-06954	America/Santo_Domingo	Atlantic Standard ("AST") - eastern Caribbean
+#
+# -04/-03 (Chile DST)
+XX	-3327-07040	America/Santiago	most of Chile
+#
+# -04/-03 (Paraguay DST)
+XX	-2516-05740	America/Asuncion	Paraguay
+#
+# -04/-03 - AST/ADT (North America DST)
+XX	+4439-06336	America/Halifax	Atlantic ("AST/ADT") - Canada; Bermuda
+#
+# -03:30/-02:30 - NST/NDT (North America DST)
+XX	+4734-05243	America/St_Johns	Newfoundland ("NST/NDT")
+#
+# -03
+XX	-2332-04637	America/Sao_Paulo	eastern South America
+#
+# -03/-02 (North America DST)
+XX	+4703-05620	America/Miquelon	St Pierre & Miquelon
+#
+# -02
+XX	-0351-03225	America/Noronha	Fernando de Noronha; South Georgia
+#
+# -02/-01 (EU DST)
+XX	+6411-05144	America/Nuuk	most of Greenland
+#
+# -01
+XX	+1455-02331	Atlantic/Cape_Verde	Cape Verde
+#
+# -01/+00 (EU DST)
+XX	+3744-02540	Atlantic/Azores	Azores
+# -01/+00 (EU DST) until 2024-03-01; then -02/-01 (EU DST)
+XX	+7029-02158	America/Scoresbysund	Ittoqqortoormiit
+#
+# +00 - GMT
+XX	+0519-00402	Africa/Abidjan	far western Africa; Iceland ("GMT")
+#
+# +00/+01 - GMT/BST (EU DST)
+XX	+513030-0000731	Europe/London	United Kingdom ("GMT/BST")
+#
+# +00/+01 - WET/WEST (EU DST)
+XX	+3843-00908	Europe/Lisbon	western Europe ("WET/WEST")
+#
+# +00/+01 - Troll DST
+XX	-720041+0023206	Antarctica/Troll	Troll Station in Antarctica
+#
+# +01 - CET
+XX	+3647+00303	Africa/Algiers	Algeria, Tunisia ("CET")
+#
+# +01 - WAT
+XX	+0627+00324	Africa/Lagos	western Africa ("WAT")
+#
+# +01/+00 - IST/GMT (EU DST in reverse)
+XX	+5320-00615	Europe/Dublin	Ireland ("IST/GMT")
+#
+# +01/+00 - (Morocco DST)
+XX	+3339-00735	Africa/Casablanca	Morocco
+#
+# +01/+02 - CET/CEST (EU DST)
+XX	+4852+00220	Europe/Paris	central Europe ("CET/CEST")
+#
+# +02 - CAT
+XX	-2558+03235	Africa/Maputo	central Africa ("CAT")
+#
+# +02 - EET
+XX	+3254+01311	Africa/Tripoli	Libya; Kaliningrad ("EET")
+#
+# +02 - SAST
+XX	-2615+02800	Africa/Johannesburg	southern Africa ("SAST")
+#
+# +02/+03 - EET/EEST (EU DST)
+XX	+3758+02343	Europe/Athens	eastern Europe ("EET/EEST")
+#
+# +02/+03 - EET/EEST (Egypt DST)
+XX	+3003+03115	Africa/Cairo	Egypt
+#
+# +02/+03 - EET/EEST (Lebanon DST)
+XX	+3353+03530	Asia/Beirut	Lebanon
+#
+# +02/+03 - EET/EEST (Moldova DST)
+XX	+4700+02850	Europe/Chisinau	Moldova
+#
+# +02/+03 - EET/EEST (Palestine DST)
+XX	+3130+03428	Asia/Gaza	Palestine
+#
+# +02/+03 - IST/IDT (Israel DST)
+XX	+314650+0351326	Asia/Jerusalem	Israel
+#
+# +03
+XX	+4101+02858	Europe/Istanbul	Near East; Belarus
+#
+# +03 - EAT
+XX	-0117+03649	Africa/Nairobi	eastern Africa ("EAT")
+#
+# +03 - MSK
+XX	+554521+0373704	Europe/Moscow	Moscow ("MSK")
+#
+# +03:30
+XX	+3540+05126	Asia/Tehran	Iran
+#
+# +04
+XX	+2518+05518	Asia/Dubai	Russia; Caucasus; Persian Gulf; Seychelles; Réunion
+#
+# +04:30
+XX	+3431+06912	Asia/Kabul	Afghanistan
+#
+# +05
+XX	+4120+06918	Asia/Tashkent	Russia; Tajikistan; Turkmenistan; Uzbekistan; Maldives
+#
+# +05 - PKT
+XX	+2452+06703	Asia/Karachi	Pakistan ("PKT")
+#
+# +05:30
+XX	+0656+07951	Asia/Colombo	Sri Lanka
+#
+# +05:30 - IST
+XX	+2232+08822	Asia/Kolkata	India ("IST")
+#
+# +05:45
+XX	+2743+08519	Asia/Kathmandu	Nepal
+#
+# +06
+XX	+2343+09025	Asia/Dhaka	Russia; Kyrgyzstan; Bhutan; Bangladesh; Chagos
+#
+# +06:30
+XX	+1647+09610	Asia/Yangon	Myanmar; Cocos
+#
+# +07
+XX	+1345+10031	Asia/Bangkok	Russia; Indochina; Christmas Island
+#
+# +07 - WIB
+XX	-0610+10648	Asia/Jakarta	Indonesia ("WIB")
+#
+# +08
+XX	+0117+10351	Asia/Singapore	Russia; Brunei; Malaysia; Singapore
+#
+# +08 - AWST
+XX	-3157+11551	Australia/Perth	Western Australia ("AWST")
+#
+# +08 - CST
+XX	+3114+12128	Asia/Shanghai	China ("CST")
+#
+# +08 - HKT
+XX	+2217+11409	Asia/Hong_Kong	Hong Kong ("HKT")
+#
+# +08 - PHT
+XX	+1435+12100	Asia/Manila	Philippines ("PHT")
+#
+# +08 - WITA
+XX	-0507+11924	Asia/Makassar	Indonesia ("WITA")
+#
+# +08:45
+XX	-3143+12852	Australia/Eucla	Eucla
+#
+# +09
+XX	+5203+11328	Asia/Chita	Russia; Palau; East Timor
+#
+# +09 - JST
+XX	+353916+1394441	Asia/Tokyo	Japan ("JST")
+#
+# +09 - KST
+XX	+3733+12658	Asia/Seoul	Korea ("KST")
+#
+# +09 - WIT
+XX	-0232+14042	Asia/Jayapura	Indonesia ("WIT")
+#
+# +09:30 - ACST
+XX	-1228+13050	Australia/Darwin	Northern Territory ("ACST")
+#
+# +09:30/+10:30 - ACST/ACDT (Australia DST)
+XX	-3455+13835	Australia/Adelaide	South Australia ("ACST/ACDT")
+#
+# +10
+XX	+4310+13156	Asia/Vladivostok	Russia; Yap; Chuuk; Papua New Guinea; Dumont d'Urville
+#
+# +10 - AEST
+XX	-2728+15302	Australia/Brisbane	Queensland ("AEST")
+#
+# +10 - ChST
+XX	+1328+14445	Pacific/Guam	Mariana Islands ("ChST")
+#
+# +10/+11 - AEST/AEDT (Australia DST)
+XX	-3352+15113	Australia/Sydney	southeast Australia ("AEST/AEDT")
+#
+# +10:30/+11
+XX	-3133+15905	Australia/Lord_Howe	Lord Howe Island
+#
+# +11
+XX	-0613+15534	Pacific/Bougainville	Russia; Kosrae; Bougainville; Solomons
+#
+# +11/+12 (Australia DST)
+XX	-2903+16758	Pacific/Norfolk	Norfolk Island
+#
+# +12
+XX	+5301+15839	Asia/Kamchatka	Russia; Tuvalu; Fiji; etc.
+#
+# +12/+13 (New Zealand DST)
+XX	-3652+17446	Pacific/Auckland	New Zealand ("NZST/NZDT")
+#
+# +12:45/+13:45 (Chatham DST)
+XX	-4357-17633	Pacific/Chatham	Chatham Islands
+#
+# +13
+XX	-210800-1751200	Pacific/Tongatapu	Kanton; Tokelau; Samoa (western); Tonga
+#
+# +14
+XX	+0152-15720	Pacific/Kiritimati	Kiritimati
-- 
2.40.1

    