carlos / platform Public

geo: embedded IANA zone.tab and links, zone and country points (nearest-region §6.2)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

claude 3 weeks ago 75a0ddcd370e7de6bd8a19a1ea3e5d0cb949a41a parent b332a81

6 files changed, +996 −0

internal/geo/data/VERSION +1 −0
internal/geo/data/links.txt +257 −0
internal/geo/data/zone.tab +448 −0
internal/geo/tz.go +165 −0
internal/geo/tz_test.go +93 −0
scripts/update-tzgeo.sh +32 −0

diff --git a/internal/geo/data/VERSION b/internal/geo/data/VERSION

new file mode 100644

index 000000000..75d34ee38

--- /dev/null

+++ b/internal/geo/data/VERSION

@@ -0,0 +1 @@

+2026b

diff --git a/internal/geo/data/links.txt b/internal/geo/data/links.txt

new file mode 100644

index 000000000..e84f6fd06

--- /dev/null

+++ b/internal/geo/data/links.txt

@@ -0,0 +1,257 @@

+Africa/Abidjan Africa/Accra

+Africa/Abidjan Africa/Bamako

+Africa/Abidjan Africa/Banjul

+Africa/Abidjan Africa/Conakry

+Africa/Abidjan Africa/Dakar

+Africa/Abidjan Africa/Freetown

+Africa/Abidjan Africa/Lome

+Africa/Abidjan Africa/Nouakchott

+Africa/Abidjan Africa/Ouagadougou

+Africa/Abidjan Africa/Timbuktu

+Africa/Abidjan Atlantic/Reykjavik

+Africa/Abidjan Atlantic/St_Helena

+Africa/Abidjan Iceland

+Africa/Cairo Egypt

+Africa/Johannesburg Africa/Maseru

+Africa/Johannesburg Africa/Mbabane

+Africa/Lagos Africa/Bangui

+Africa/Lagos Africa/Brazzaville

+Africa/Lagos Africa/Douala

+Africa/Lagos Africa/Kinshasa

+Africa/Lagos Africa/Libreville

+Africa/Lagos Africa/Luanda

+Africa/Lagos Africa/Malabo

+Africa/Lagos Africa/Niamey

+Africa/Lagos Africa/Porto-Novo

+Africa/Maputo Africa/Blantyre

+Africa/Maputo Africa/Bujumbura

+Africa/Maputo Africa/Gaborone

+Africa/Maputo Africa/Harare

+Africa/Maputo Africa/Kigali

+Africa/Maputo Africa/Lubumbashi

+Africa/Maputo Africa/Lusaka

+Africa/Nairobi Africa/Addis_Ababa

+Africa/Nairobi Africa/Asmara

+Africa/Nairobi Africa/Asmera

+Africa/Nairobi Africa/Dar_es_Salaam

+Africa/Nairobi Africa/Djibouti

+Africa/Nairobi Africa/Kampala

+Africa/Nairobi Africa/Mogadishu

+Africa/Nairobi Indian/Antananarivo

+Africa/Nairobi Indian/Comoro

+Africa/Nairobi Indian/Mayotte

+Africa/Tripoli Libya

+America/Adak America/Atka

+America/Adak US/Aleutian

+America/Anchorage US/Alaska

+America/Argentina/Buenos_Aires America/Buenos_Aires

+America/Argentina/Catamarca America/Argentina/ComodRivadavia

+America/Argentina/Catamarca America/Catamarca

+America/Argentina/Cordoba America/Cordoba

+America/Argentina/Cordoba America/Rosario

+America/Argentina/Jujuy America/Jujuy

+America/Argentina/Mendoza America/Mendoza

+America/Chicago CST6CDT

+America/Chicago US/Central

+America/Denver America/Shiprock

+America/Denver MST7MDT

+America/Denver Navajo

+America/Denver US/Mountain

+America/Detroit US/Michigan

+America/Edmonton America/Yellowknife

+America/Edmonton Canada/Mountain

+America/Halifax Canada/Atlantic

+America/Havana Cuba

+America/Indiana/Indianapolis America/Fort_Wayne

+America/Indiana/Indianapolis America/Indianapolis

+America/Indiana/Indianapolis US/East-Indiana

+America/Indiana/Knox America/Knox_IN

+America/Indiana/Knox US/Indiana-Starke

+America/Iqaluit America/Pangnirtung

+America/Jamaica Jamaica

+America/Kentucky/Louisville America/Louisville

+America/Los_Angeles PST8PDT

+America/Los_Angeles US/Pacific

+America/Manaus Brazil/West

+America/Mazatlan Mexico/BajaSur

+America/Mexico_City Mexico/General

+America/New_York EST5EDT

+America/New_York US/Eastern

+America/Noronha Brazil/DeNoronha

+America/Nuuk America/Godthab

+America/Panama America/Atikokan

+America/Panama America/Cayman

+America/Panama America/Coral_Harbour

+America/Panama EST

+America/Phoenix America/Creston

+America/Phoenix MST

+America/Phoenix US/Arizona

+America/Puerto_Rico America/Anguilla

+America/Puerto_Rico America/Antigua

+America/Puerto_Rico America/Aruba

+America/Puerto_Rico America/Blanc-Sablon

+America/Puerto_Rico America/Curacao

+America/Puerto_Rico America/Dominica

+America/Puerto_Rico America/Grenada

+America/Puerto_Rico America/Guadeloupe

+America/Puerto_Rico America/Kralendijk

+America/Puerto_Rico America/Lower_Princes

+America/Puerto_Rico America/Marigot

+America/Puerto_Rico America/Montserrat

+America/Puerto_Rico America/Port_of_Spain

+America/Puerto_Rico America/St_Barthelemy

+America/Puerto_Rico America/St_Kitts

+America/Puerto_Rico America/St_Lucia

+America/Puerto_Rico America/St_Thomas

+America/Puerto_Rico America/St_Vincent

+America/Puerto_Rico America/Tortola

+America/Puerto_Rico America/Virgin

+America/Regina Canada/Saskatchewan

+America/Rio_Branco America/Porto_Acre

+America/Rio_Branco Brazil/Acre

+America/Santiago Chile/Continental

+America/Sao_Paulo Brazil/East

+America/St_Johns Canada/Newfoundland

+America/Tijuana America/Ensenada

+America/Tijuana America/Santa_Isabel

+America/Tijuana Mexico/BajaNorte

+America/Toronto America/Montreal

+America/Toronto America/Nassau

+America/Toronto America/Nipigon

+America/Toronto America/Thunder_Bay

+America/Toronto Canada/Eastern

+America/Vancouver Canada/Pacific

+America/Whitehorse Canada/Yukon

+America/Winnipeg America/Rainy_River

+America/Winnipeg Canada/Central

+Asia/Ashgabat Asia/Ashkhabad

+Asia/Bangkok Asia/Phnom_Penh

+Asia/Bangkok Asia/Vientiane

+Asia/Bangkok Indian/Christmas

+Asia/Dhaka Asia/Dacca

+Asia/Dubai Asia/Muscat

+Asia/Dubai Indian/Mahe

+Asia/Dubai Indian/Reunion

+Asia/Ho_Chi_Minh Asia/Saigon

+Asia/Hong_Kong Hongkong

+Asia/Jerusalem Asia/Tel_Aviv

+Asia/Jerusalem Israel

+Asia/Kathmandu Asia/Katmandu

+Asia/Kolkata Asia/Calcutta

+Asia/Kuching Asia/Brunei

+Asia/Macau Asia/Macao

+Asia/Makassar Asia/Ujung_Pandang

+Asia/Nicosia Europe/Nicosia

+Asia/Qatar Asia/Bahrain

+Asia/Riyadh Antarctica/Syowa

+Asia/Riyadh Asia/Aden

+Asia/Riyadh Asia/Kuwait

+Asia/Seoul ROK

+Asia/Shanghai Asia/Chongqing

+Asia/Shanghai Asia/Chungking

+Asia/Shanghai Asia/Harbin

+Asia/Shanghai PRC

+Asia/Singapore Asia/Kuala_Lumpur

+Asia/Singapore Singapore

+Asia/Taipei ROC

+Asia/Tehran Iran

+Asia/Thimphu Asia/Thimbu

+Asia/Tokyo Japan

+Asia/Ulaanbaatar Asia/Choibalsan

+Asia/Ulaanbaatar Asia/Ulan_Bator

+Asia/Urumqi Asia/Kashgar

+Asia/Yangon Asia/Rangoon

+Asia/Yangon Indian/Cocos

+Atlantic/Faroe Atlantic/Faeroe

+Australia/Adelaide Australia/South

+Australia/Brisbane Australia/Queensland

+Australia/Broken_Hill Australia/Yancowinna

+Australia/Darwin Australia/North

+Australia/Hobart Australia/Currie

+Australia/Hobart Australia/Tasmania

+Australia/Lord_Howe Australia/LHI

+Australia/Melbourne Australia/Victoria

+Australia/Perth Australia/West

+Australia/Sydney Australia/ACT

+Australia/Sydney Australia/Canberra

+Australia/Sydney Australia/NSW

+Etc/GMT Etc/GMT+0

+Etc/GMT Etc/GMT-0

+Etc/GMT Etc/GMT0

+Etc/GMT Etc/Greenwich

+Etc/GMT GMT

+Etc/GMT GMT+0

+Etc/GMT GMT-0

+Etc/GMT GMT0

+Etc/GMT Greenwich

+Etc/UTC Etc/UCT

+Etc/UTC Etc/Universal

+Etc/UTC Etc/Zulu

+Etc/UTC UCT

+Etc/UTC Universal

+Etc/UTC UTC

+Etc/UTC Zulu

+Europe/Athens EET

+Europe/Belgrade Europe/Ljubljana

+Europe/Belgrade Europe/Podgorica

+Europe/Belgrade Europe/Sarajevo

+Europe/Belgrade Europe/Skopje

+Europe/Belgrade Europe/Zagreb

+Europe/Berlin Arctic/Longyearbyen

+Europe/Berlin Atlantic/Jan_Mayen

+Europe/Berlin Europe/Copenhagen

+Europe/Berlin Europe/Oslo

+Europe/Berlin Europe/Stockholm

+Europe/Brussels CET

+Europe/Brussels Europe/Amsterdam

+Europe/Brussels Europe/Luxembourg

+Europe/Brussels MET

+Europe/Chisinau Europe/Tiraspol

+Europe/Dublin Eire

+Europe/Helsinki Europe/Mariehamn

+Europe/Istanbul Asia/Istanbul

+Europe/Istanbul Turkey

+Europe/Kyiv Europe/Kiev

+Europe/Kyiv Europe/Uzhgorod

+Europe/Kyiv Europe/Zaporozhye

+Europe/Lisbon Portugal

+Europe/Lisbon WET

+Europe/London Europe/Belfast

+Europe/London Europe/Guernsey

+Europe/London Europe/Isle_of_Man

+Europe/London Europe/Jersey

+Europe/London GB

+Europe/London GB-Eire

+Europe/Moscow W-SU

+Europe/Paris Europe/Monaco

+Europe/Prague Europe/Bratislava

+Europe/Rome Europe/San_Marino

+Europe/Rome Europe/Vatican

+Europe/Warsaw Poland

+Europe/Zurich Europe/Busingen

+Europe/Zurich Europe/Vaduz

+Indian/Maldives Indian/Kerguelen

+Pacific/Auckland Antarctica/McMurdo

+Pacific/Auckland Antarctica/South_Pole

+Pacific/Auckland NZ

+Pacific/Chatham NZ-CHAT

+Pacific/Easter Chile/EasterIsland

+Pacific/Guadalcanal Pacific/Pohnpei

+Pacific/Guadalcanal Pacific/Ponape

+Pacific/Guam Pacific/Saipan

+Pacific/Honolulu HST

+Pacific/Honolulu Pacific/Johnston

+Pacific/Honolulu US/Hawaii

+Pacific/Kanton Pacific/Enderbury

+Pacific/Kwajalein Kwajalein

+Pacific/Pago_Pago Pacific/Midway

+Pacific/Pago_Pago Pacific/Samoa

+Pacific/Pago_Pago US/Samoa

+Pacific/Port_Moresby Antarctica/DumontDUrville

+Pacific/Port_Moresby Pacific/Chuuk

+Pacific/Port_Moresby Pacific/Truk

+Pacific/Port_Moresby Pacific/Yap

+Pacific/Tarawa Pacific/Funafuti

+Pacific/Tarawa Pacific/Majuro

+Pacific/Tarawa Pacific/Wake

+Pacific/Tarawa Pacific/Wallis

diff --git a/internal/geo/data/zone.tab b/internal/geo/data/zone.tab

new file mode 100644

index 000000000..2ae8a8c43

--- /dev/null

+++ b/internal/geo/data/zone.tab

@@ -0,0 +1,448 @@

+# 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 (2021-09-20):

+# 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:

+# 1. This file contains only ASCII characters.

+# 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 timezone where civil

+# clocks have agreed since 1970; this is a narrower definition than

+# that of zone1970.tab.

+# Unlike zone1970.tab, a row's third column can be a Link from

+# 'backward' instead of a Zone.

+# 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

+AD +4230+00131 Europe/Andorra

+AE +2518+05518 Asia/Dubai

+AF +3431+06912 Asia/Kabul

+AG +1703-06148 America/Antigua

+AI +1812-06304 America/Anguilla

+AL +4120+01950 Europe/Tirane

+AM +4011+04430 Asia/Yerevan

+AO -0848+01314 Africa/Luanda

+AQ -7750+16636 Antarctica/McMurdo New Zealand time - McMurdo, South Pole

+AQ -6617+11031 Antarctica/Casey Casey

+AQ -6835+07758 Antarctica/Davis Davis

+AQ -6640+14001 Antarctica/DumontDUrville Dumont-d'Urville

+AQ -6736+06253 Antarctica/Mawson Mawson

+AQ -6448-06406 Antarctica/Palmer Palmer

+AQ -6734-06808 Antarctica/Rothera Rothera

+AQ -690022+0393524 Antarctica/Syowa Syowa

+AQ -720041+0023206 Antarctica/Troll Troll

+AQ -7824+10654 Antarctica/Vostok Vostok

+AR -3436-05827 America/Argentina/Buenos_Aires Buenos Aires (BA, CF)

+AR -3124-06411 America/Argentina/Cordoba Argentina (most areas: CB, CC, CN, ER, FM, MN, SE, SF)

+AR -2447-06525 America/Argentina/Salta Salta (SA, LP, NQ, RN)

+AR -2411-06518 America/Argentina/Jujuy Jujuy (JY)

+AR -2649-06513 America/Argentina/Tucuman Tucuman (TM)

+AR -2828-06547 America/Argentina/Catamarca Catamarca (CT), Chubut (CH)

+AR -2926-06651 America/Argentina/La_Rioja La Rioja (LR)

+AR -3132-06831 America/Argentina/San_Juan San Juan (SJ)

+AR -3253-06849 America/Argentina/Mendoza Mendoza (MZ)

+AR -3319-06621 America/Argentina/San_Luis San Luis (SL)

+AR -5138-06913 America/Argentina/Rio_Gallegos Santa Cruz (SC)

+AR -5448-06818 America/Argentina/Ushuaia Tierra del Fuego (TF)

+AS -1416-17042 Pacific/Pago_Pago

+AT +4813+01620 Europe/Vienna

+AU -3133+15905 Australia/Lord_Howe Lord Howe Island

+AU -5430+15857 Antarctica/Macquarie Macquarie Island

+AU -4253+14719 Australia/Hobart Tasmania

+AU -3749+14458 Australia/Melbourne Victoria

+AU -3352+15113 Australia/Sydney New South Wales (most areas)

+AU -3157+14127 Australia/Broken_Hill New South Wales (Yancowinna)

+AU -2728+15302 Australia/Brisbane Queensland (most areas)

+AU -2016+14900 Australia/Lindeman Queensland (Whitsunday Islands)

+AU -3455+13835 Australia/Adelaide South Australia

+AU -1228+13050 Australia/Darwin Northern Territory

+AU -3157+11551 Australia/Perth Western Australia (most areas)

+AU -3143+12852 Australia/Eucla Western Australia (Eucla)

+AW +1230-06958 America/Aruba

+AX +6006+01957 Europe/Mariehamn

+AZ +4023+04951 Asia/Baku

+BA +4352+01825 Europe/Sarajevo

+BB +1306-05937 America/Barbados

+BD +2343+09025 Asia/Dhaka

+BE +5050+00420 Europe/Brussels

+BF +1222-00131 Africa/Ouagadougou

+BG +4241+02319 Europe/Sofia

+BH +2623+05035 Asia/Bahrain

+BI -0323+02922 Africa/Bujumbura

+BJ +0629+00237 Africa/Porto-Novo

+BL +1753-06251 America/St_Barthelemy

+BM +3217-06446 Atlantic/Bermuda

+BN +0456+11455 Asia/Brunei

+BO -1630-06809 America/La_Paz

+BQ +120903-0681636 America/Kralendijk

+BR -0351-03225 America/Noronha Atlantic islands

+BR -0127-04829 America/Belem Para (east), Amapa

+BR -0343-03830 America/Fortaleza Brazil (northeast: MA, PI, CE, RN, PB)

+BR -0803-03454 America/Recife Pernambuco

+BR -0712-04812 America/Araguaina Tocantins

+BR -0940-03543 America/Maceio Alagoas, Sergipe

+BR -1259-03831 America/Bahia Bahia

+BR -2332-04637 America/Sao_Paulo Brazil (southeast: GO, DF, MG, ES, RJ, SP, PR, SC, RS)

+BR -2027-05437 America/Campo_Grande Mato Grosso do Sul

+BR -1535-05605 America/Cuiaba Mato Grosso

+BR -0226-05452 America/Santarem Para (west)

+BR -0846-06354 America/Porto_Velho Rondonia

+BR +0249-06040 America/Boa_Vista Roraima

+BR -0308-06001 America/Manaus Amazonas (east)

+BR -0640-06952 America/Eirunepe Amazonas (west)

+BR -0958-06748 America/Rio_Branco Acre

+BS +2505-07721 America/Nassau

+BT +2728+08939 Asia/Thimphu

+BW -2439+02555 Africa/Gaborone

+BY +5354+02734 Europe/Minsk

+BZ +1730-08812 America/Belize

+CA +4734-05243 America/St_Johns Newfoundland, Labrador (SE)

+CA +4439-06336 America/Halifax Atlantic - NS (most areas), PE

+CA +4612-05957 America/Glace_Bay Atlantic - NS (Cape Breton)

+CA +4606-06447 America/Moncton Atlantic - New Brunswick

+CA +5320-06025 America/Goose_Bay Atlantic - Labrador (most areas)

+CA +5125-05707 America/Blanc-Sablon AST - QC (Lower North Shore)

+CA +4339-07923 America/Toronto Eastern - ON & QC (most areas)

+CA +6344-06828 America/Iqaluit Eastern - NU (most areas)

+CA +484531-0913718 America/Atikokan EST - ON (Atikokan), NU (Coral H)

+CA +4953-09709 America/Winnipeg Central - ON (west), Manitoba

+CA +744144-0944945 America/Resolute Central - NU (Resolute)

+CA +624900-0920459 America/Rankin_Inlet Central - NU (central)

+CA +5024-10439 America/Regina CST - SK (most areas)

+CA +5017-10750 America/Swift_Current CST - SK (midwest)

+CA +5333-11328 America/Edmonton Mountain - AB, BC(E), NT(E), SK(W)

+CA +690650-1050310 America/Cambridge_Bay Mountain - NU (west)

+CA +682059-1334300 America/Inuvik Mountain - NT (west)

+CA +4916-12307 America/Vancouver MST - BC (most areas)

+CA +4906-11631 America/Creston MST - BC (Creston)

+CA +5546-12014 America/Dawson_Creek MST - BC (Dawson Cr, Ft St John)

+CA +5848-12242 America/Fort_Nelson MST - BC (Ft Nelson)

+CA +6043-13503 America/Whitehorse MST - Yukon (east)

+CA +6404-13925 America/Dawson MST - Yukon (west)

+CC -1210+09655 Indian/Cocos

+CD -0418+01518 Africa/Kinshasa Dem. Rep. of Congo (west)

+CD -1140+02728 Africa/Lubumbashi Dem. Rep. of Congo (east)

+CF +0422+01835 Africa/Bangui

+CG -0416+01517 Africa/Brazzaville

+CH +4723+00832 Europe/Zurich

+CI +0519-00402 Africa/Abidjan

+CK -2114-15946 Pacific/Rarotonga

+CL -3327-07040 America/Santiago most of Chile

+CL -4534-07204 America/Coyhaique Aysen Region

+CL -5309-07055 America/Punta_Arenas Magallanes Region

+CL -2709-10926 Pacific/Easter Easter Island

+CM +0403+00942 Africa/Douala

+CN +3114+12128 Asia/Shanghai Beijing Time

+CN +4348+08735 Asia/Urumqi Xinjiang Time

+CO +0436-07405 America/Bogota

+CR +0956-08405 America/Costa_Rica

+CU +2308-08222 America/Havana

+CV +1455-02331 Atlantic/Cape_Verde

+CW +1211-06900 America/Curacao

+CX -1025+10543 Indian/Christmas

+CY +3510+03322 Asia/Nicosia most of Cyprus

+CY +3507+03357 Asia/Famagusta Northern Cyprus

+CZ +5005+01426 Europe/Prague

+DE +5230+01322 Europe/Berlin most of Germany

+DE +4742+00841 Europe/Busingen Busingen

+DJ +1136+04309 Africa/Djibouti

+DK +5540+01235 Europe/Copenhagen

+DM +1518-06124 America/Dominica

+DO +1828-06954 America/Santo_Domingo

+DZ +3647+00303 Africa/Algiers

+EC -0210-07950 America/Guayaquil Ecuador (mainland)

+EC -0054-08936 Pacific/Galapagos Galapagos Islands

+EE +5925+02445 Europe/Tallinn

+EG +3003+03115 Africa/Cairo

+EH +2709-01312 Africa/El_Aaiun

+ER +1520+03853 Africa/Asmara

+ES +4024-00341 Europe/Madrid Spain (mainland)

+ES +3553-00519 Africa/Ceuta Ceuta, Melilla

+ES +2806-01524 Atlantic/Canary Canary Islands

+ET +0902+03842 Africa/Addis_Ababa

+FI +6010+02458 Europe/Helsinki

+FJ -1808+17825 Pacific/Fiji

+FK -5142-05751 Atlantic/Stanley

+FM +0725+15147 Pacific/Chuuk Chuuk/Truk, Yap

+FM +0658+15813 Pacific/Pohnpei Pohnpei/Ponape

+FM +0519+16259 Pacific/Kosrae Kosrae

+FO +6201-00646 Atlantic/Faroe

+FR +4852+00220 Europe/Paris

+GA +0023+00927 Africa/Libreville

+GB +513030-0000731 Europe/London

+GD +1203-06145 America/Grenada

+GE +4143+04449 Asia/Tbilisi

+GF +0456-05220 America/Cayenne

+GG +492717-0023210 Europe/Guernsey

+GH +0533-00013 Africa/Accra

+GI +3608-00521 Europe/Gibraltar

+GL +6411-05144 America/Nuuk most of Greenland

+GL +7646-01840 America/Danmarkshavn National Park (east coast)

+GL +7029-02158 America/Scoresbysund Scoresbysund/Ittoqqortoormiit

+GL +7634-06847 America/Thule Thule/Pituffik

+GM +1328-01639 Africa/Banjul

+GN +0931-01343 Africa/Conakry

+GP +1614-06132 America/Guadeloupe

+GQ +0345+00847 Africa/Malabo

+GR +3758+02343 Europe/Athens

+GS -5416-03632 Atlantic/South_Georgia

+GT +1438-09031 America/Guatemala

+GU +1328+14445 Pacific/Guam

+GW +1151-01535 Africa/Bissau

+GY +0648-05810 America/Guyana

+HK +2217+11409 Asia/Hong_Kong

+HN +1406-08713 America/Tegucigalpa

+HR +4548+01558 Europe/Zagreb

+HT +1832-07220 America/Port-au-Prince

+HU +4730+01905 Europe/Budapest

+ID -0610+10648 Asia/Jakarta Java, Sumatra

+ID -0002+10920 Asia/Pontianak Borneo (west, central)

+ID -0507+11924 Asia/Makassar Borneo (east, south), Sulawesi/Celebes, Bali, Nusa Tengarra, Timor (west)

+ID -0232+14042 Asia/Jayapura New Guinea (West Papua / Irian Jaya), Malukus/Moluccas

+IE +5320-00615 Europe/Dublin

+IL +314650+0351326 Asia/Jerusalem

+IM +5409-00428 Europe/Isle_of_Man

+IN +2232+08822 Asia/Kolkata

+IO -0720+07225 Indian/Chagos

+IQ +3321+04425 Asia/Baghdad

+IR +3540+05126 Asia/Tehran

+IS +6409-02151 Atlantic/Reykjavik

+IT +4154+01229 Europe/Rome

+JE +491101-0020624 Europe/Jersey

+JM +175805-0764736 America/Jamaica

+JO +3157+03556 Asia/Amman

+JP +353916+1394441 Asia/Tokyo

+KE -0117+03649 Africa/Nairobi

+KG +4254+07436 Asia/Bishkek

+KH +1133+10455 Asia/Phnom_Penh

+KI +0125+17300 Pacific/Tarawa Gilbert Islands

+KI -0247-17143 Pacific/Kanton Phoenix Islands

+KI +0152-15720 Pacific/Kiritimati Line Islands

+KM -1141+04316 Indian/Comoro

+KN +1718-06243 America/St_Kitts

+KP +3901+12545 Asia/Pyongyang

+KR +3733+12658 Asia/Seoul

+KW +2920+04759 Asia/Kuwait

+KY +1918-08123 America/Cayman

+KZ +4315+07657 Asia/Almaty most of Kazakhstan

+KZ +4448+06528 Asia/Qyzylorda Qyzylorda/Kyzylorda/Kzyl-Orda

+KZ +5312+06337 Asia/Qostanay Qostanay/Kostanay/Kustanay

+KZ +5017+05710 Asia/Aqtobe Aqtobe/Aktobe

+KZ +4431+05016 Asia/Aqtau Mangghystau/Mankistau

+KZ +4707+05156 Asia/Atyrau Atyrau/Atirau/Gur'yev

+KZ +5113+05121 Asia/Oral West Kazakhstan

+LA +1758+10236 Asia/Vientiane

+LB +3353+03530 Asia/Beirut

+LC +1401-06100 America/St_Lucia

+LI +4709+00931 Europe/Vaduz

+LK +0656+07951 Asia/Colombo

+LR +0618-01047 Africa/Monrovia

+LS -2928+02730 Africa/Maseru

+LT +5441+02519 Europe/Vilnius

+LU +4936+00609 Europe/Luxembourg

+LV +5657+02406 Europe/Riga

+LY +3254+01311 Africa/Tripoli

+MA +3339-00735 Africa/Casablanca

+MC +4342+00723 Europe/Monaco

+MD +4700+02850 Europe/Chisinau

+ME +4226+01916 Europe/Podgorica

+MF +1804-06305 America/Marigot

+MG -1855+04731 Indian/Antananarivo

+MH +0709+17112 Pacific/Majuro most of Marshall Islands

+MH +0905+16720 Pacific/Kwajalein Kwajalein

+MK +4159+02126 Europe/Skopje

+ML +1239-00800 Africa/Bamako

+MM +1647+09610 Asia/Yangon

+MN +4755+10653 Asia/Ulaanbaatar most of Mongolia

+MN +4801+09139 Asia/Hovd Bayan-Olgii, Hovd, Uvs

+MO +221150+1133230 Asia/Macau

+MP +1512+14545 Pacific/Saipan

+MQ +1436-06105 America/Martinique

+MR +1806-01557 Africa/Nouakchott

+MS +1643-06213 America/Montserrat

+MT +3554+01431 Europe/Malta

+MU -2010+05730 Indian/Mauritius

+MV +0410+07330 Indian/Maldives

+MW -1547+03500 Africa/Blantyre

+MX +1924-09909 America/Mexico_City Central Mexico

+MX +2105-08646 America/Cancun Quintana Roo

+MX +2058-08937 America/Merida Campeche, Yucatan

+MX +2540-10019 America/Monterrey Durango; Coahuila, Nuevo Leon, Tamaulipas (most areas)

+MX +2550-09730 America/Matamoros Coahuila, Nuevo Leon, Tamaulipas (US border)

+MX +2838-10605 America/Chihuahua Chihuahua (most areas)

+MX +3144-10629 America/Ciudad_Juarez Chihuahua (US border - west)

+MX +2934-10425 America/Ojinaga Chihuahua (US border - east)

+MX +2313-10625 America/Mazatlan Baja California Sur, Nayarit (most areas), Sinaloa

+MX +2048-10515 America/Bahia_Banderas Bahia de Banderas

+MX +2904-11058 America/Hermosillo Sonora

+MX +3232-11701 America/Tijuana Baja California

+MY +0310+10142 Asia/Kuala_Lumpur Malaysia (peninsula)

+MY +0133+11020 Asia/Kuching Sabah, Sarawak

+MZ -2558+03235 Africa/Maputo

+NA -2234+01706 Africa/Windhoek

+NC -2216+16627 Pacific/Noumea

+NE +1331+00207 Africa/Niamey

+NF -2903+16758 Pacific/Norfolk

+NG +0627+00324 Africa/Lagos

+NI +1209-08617 America/Managua

+NL +5222+00454 Europe/Amsterdam

+NO +5955+01045 Europe/Oslo

+NP +2743+08519 Asia/Kathmandu

+NR -0031+16655 Pacific/Nauru

+NU -1901-16955 Pacific/Niue

+NZ -3652+17446 Pacific/Auckland most of New Zealand

+NZ -4357-17633 Pacific/Chatham Chatham Islands

+OM +2336+05835 Asia/Muscat

+PA +0858-07932 America/Panama

+PE -1203-07703 America/Lima

+PF -1732-14934 Pacific/Tahiti Society Islands

+PF -0900-13930 Pacific/Marquesas Marquesas Islands

+PF -2308-13457 Pacific/Gambier Gambier Islands

+PG -0930+14710 Pacific/Port_Moresby most of Papua New Guinea

+PG -0613+15534 Pacific/Bougainville Bougainville

+PH +143512+1205804 Asia/Manila

+PK +2452+06703 Asia/Karachi

+PL +5215+02100 Europe/Warsaw

+PM +4703-05620 America/Miquelon

+PN -2504-13005 Pacific/Pitcairn

+PR +182806-0660622 America/Puerto_Rico

+PS +3130+03428 Asia/Gaza Gaza Strip

+PS +313200+0350542 Asia/Hebron West Bank

+PT +3843-00908 Europe/Lisbon Portugal (mainland)

+PT +3238-01654 Atlantic/Madeira Madeira Islands

+PT +3744-02540 Atlantic/Azores Azores

+PW +0720+13429 Pacific/Palau

+PY -2516-05740 America/Asuncion

+QA +2517+05132 Asia/Qatar

+RE -2052+05528 Indian/Reunion

+RO +4426+02606 Europe/Bucharest

+RS +4450+02030 Europe/Belgrade

+RU +5443+02030 Europe/Kaliningrad MSK-01 - Kaliningrad

+RU +554521+0373704 Europe/Moscow MSK+00 - Moscow area

+# The obsolescent zone.tab format cannot represent Europe/Simferopol well.

+# Put it in RU section and list as UA. See "territorial claims" above.

+# Programs should use zone1970.tab instead; see above.

+UA +4457+03406 Europe/Simferopol Crimea

+RU +5836+04939 Europe/Kirov MSK+00 - Kirov

+RU +4844+04425 Europe/Volgograd MSK+00 - Volgograd

+RU +4621+04803 Europe/Astrakhan MSK+01 - Astrakhan

+RU +5134+04602 Europe/Saratov MSK+01 - Saratov

+RU +5420+04824 Europe/Ulyanovsk MSK+01 - Ulyanovsk

+RU +5312+05009 Europe/Samara MSK+01 - Samara, Udmurtia

+RU +5651+06036 Asia/Yekaterinburg MSK+02 - Urals

+RU +5500+07324 Asia/Omsk MSK+03 - Omsk

+RU +5502+08255 Asia/Novosibirsk MSK+04 - Novosibirsk

+RU +5322+08345 Asia/Barnaul MSK+04 - Altai

+RU +5630+08458 Asia/Tomsk MSK+04 - Tomsk

+RU +5345+08707 Asia/Novokuznetsk MSK+04 - Kemerovo

+RU +5601+09250 Asia/Krasnoyarsk MSK+04 - Krasnoyarsk area

+RU +5216+10420 Asia/Irkutsk MSK+05 - Irkutsk, Buryatia

+RU +5203+11328 Asia/Chita MSK+06 - Zabaykalsky

+RU +6200+12940 Asia/Yakutsk MSK+06 - Lena River

+RU +623923+1353314 Asia/Khandyga MSK+06 - Tomponsky, Ust-Maysky

+RU +4310+13156 Asia/Vladivostok MSK+07 - Amur River

+RU +643337+1431336 Asia/Ust-Nera MSK+07 - Oymyakonsky

+RU +5934+15048 Asia/Magadan MSK+08 - Magadan

+RU +4658+14242 Asia/Sakhalin MSK+08 - Sakhalin Island

+RU +6728+15343 Asia/Srednekolymsk MSK+08 - Sakha (E), N Kuril Is

+RU +5301+15839 Asia/Kamchatka MSK+09 - Kamchatka

+RU +6445+17729 Asia/Anadyr MSK+09 - Bering Sea

+RW -0157+03004 Africa/Kigali

+SA +2438+04643 Asia/Riyadh

+SB -0932+16012 Pacific/Guadalcanal

+SC -0440+05528 Indian/Mahe

+SD +1536+03232 Africa/Khartoum

+SE +5920+01803 Europe/Stockholm

+SG +0117+10351 Asia/Singapore

+SH -1555-00542 Atlantic/St_Helena

+SI +4603+01431 Europe/Ljubljana

+SJ +7800+01600 Arctic/Longyearbyen

+SK +4809+01707 Europe/Bratislava

+SL +0830-01315 Africa/Freetown

+SM +4355+01228 Europe/San_Marino

+SN +1440-01726 Africa/Dakar

+SO +0204+04522 Africa/Mogadishu

+SR +0550-05510 America/Paramaribo

+SS +0451+03137 Africa/Juba

+ST +0020+00644 Africa/Sao_Tome

+SV +1342-08912 America/El_Salvador

+SX +180305-0630250 America/Lower_Princes

+SY +3330+03618 Asia/Damascus

+SZ -2618+03106 Africa/Mbabane

+TC +2128-07108 America/Grand_Turk

+TD +1207+01503 Africa/Ndjamena

+TF -492110+0701303 Indian/Kerguelen

+TG +0608+00113 Africa/Lome

+TH +1345+10031 Asia/Bangkok

+TJ +3835+06848 Asia/Dushanbe

+TK -0922-17114 Pacific/Fakaofo

+TL -0833+12535 Asia/Dili

+TM +3757+05823 Asia/Ashgabat

+TN +3648+01011 Africa/Tunis

+TO -210800-1751200 Pacific/Tongatapu

+TR +4101+02858 Europe/Istanbul

+TT +1039-06131 America/Port_of_Spain

+TV -0831+17913 Pacific/Funafuti

+TW +2503+12130 Asia/Taipei

+TZ -0648+03917 Africa/Dar_es_Salaam

+UA +5026+03031 Europe/Kyiv most of Ukraine

+UG +0019+03225 Africa/Kampala

+UM +2813-17722 Pacific/Midway Midway Islands

+UM +1917+16637 Pacific/Wake Wake Island

+US +404251-0740023 America/New_York Eastern (most areas)

+US +421953-0830245 America/Detroit Eastern - MI (most areas)

+US +381515-0854534 America/Kentucky/Louisville Eastern - KY (Louisville area)

+US +364947-0845057 America/Kentucky/Monticello Eastern - KY (Wayne)

+US +394606-0860929 America/Indiana/Indianapolis Eastern - IN (most areas)

+US +384038-0873143 America/Indiana/Vincennes Eastern - IN (Da, Du, K, Mn)

+US +410305-0863611 America/Indiana/Winamac Eastern - IN (Pulaski)

+US +382232-0862041 America/Indiana/Marengo Eastern - IN (Crawford)

+US +382931-0871643 America/Indiana/Petersburg Eastern - IN (Pike)

+US +384452-0850402 America/Indiana/Vevay Eastern - IN (Switzerland)

+US +415100-0873900 America/Chicago Central (most areas)

+US +375711-0864541 America/Indiana/Tell_City Central - IN (Perry)

+US +411745-0863730 America/Indiana/Knox Central - IN (Starke)

+US +450628-0873651 America/Menominee Central - MI (Wisconsin border)

+US +470659-1011757 America/North_Dakota/Center Central - ND (Oliver)

+US +465042-1012439 America/North_Dakota/New_Salem Central - ND (Morton rural)

+US +471551-1014640 America/North_Dakota/Beulah Central - ND (Mercer)

+US +394421-1045903 America/Denver Mountain (most areas)

+US +433649-1161209 America/Boise Mountain - ID (south), OR (east)

+US +332654-1120424 America/Phoenix MST - AZ (except Navajo)

+US +340308-1181434 America/Los_Angeles Pacific

+US +611305-1495401 America/Anchorage Alaska (most areas)

+US +581807-1342511 America/Juneau Alaska - Juneau area

+US +571035-1351807 America/Sitka Alaska - Sitka area

+US +550737-1313435 America/Metlakatla Alaska - Annette Island

+US +593249-1394338 America/Yakutat Alaska - Yakutat

+US +643004-1652423 America/Nome Alaska (west)

+US +515248-1763929 America/Adak Alaska - western Aleutians

+US +211825-1575130 Pacific/Honolulu Hawaii

+UY -345433-0561245 America/Montevideo

+UZ +3940+06648 Asia/Samarkand Uzbekistan (west)

+UZ +4120+06918 Asia/Tashkent Uzbekistan (east)

+VA +415408+0122711 Europe/Vatican

+VC +1309-06114 America/St_Vincent

+VE +1030-06656 America/Caracas

+VG +1827-06437 America/Tortola

+VI +1821-06456 America/St_Thomas

+VN +1045+10640 Asia/Ho_Chi_Minh

+VU -1740+16825 Pacific/Efate

+WF -1318-17610 Pacific/Wallis

+WS -1350-17144 Pacific/Apia

+YE +1245+04512 Asia/Aden

+YT -1247+04514 Indian/Mayotte

+ZA -2615+02800 Africa/Johannesburg

+ZM -1525+02817 Africa/Lusaka

+ZW -1750+03103 Africa/Harare

diff --git a/internal/geo/tz.go b/internal/geo/tz.go

new file mode 100644

index 000000000..ed0976860

--- /dev/null

+++ b/internal/geo/tz.go

@@ -0,0 +1,165 @@

+package geo

+import (

+ _ "embed"

+ "regexp"

+ "strconv"

+ "strings"

+ "sync"

+//go:embed data/zone.tab

+var zoneTab string

+//go:embed data/links.txt

+var linksTxt string

+//go:embed data/VERSION

+var tzVersion string

+// TZDataVersion is the IANA release the embedded tables came from.

+func TZDataVersion() string { return strings.TrimSpace(tzVersion) }

+var (

+ tzOnce sync.Once

+ zonePoints map[string]Point // lowercased zone name -> point

+ zoneLinks map[string]string

+ countryOne map[string]Point // countries with exactly one row

+ rowsPerCC map[string]int

+// zoneShape is spec §6.2 step 1: at most 64 bytes, one to three

+// "/"-separated segments of [A-Za-z0-9_+-].

+var zoneShape = regexp.MustCompile(`^[A-Za-z0-9_+\-]+(/[A-Za-z0-9_+\-]+){0,2}$`)

+// notAPlace names an offset or a machine, not a place (R3).

+var notAPlace = map[string]bool{

+ "": true, "local": true, "localtime": true, "posixrules": true,

+ "utc": true, "uct": true, "gmt": true, "universal": true, "zulu": true,

+ "factory": true,

+func loadTZ() {

+ zonePoints = map[string]Point{}

+ countryOne = map[string]Point{}

+ rowsPerCC = map[string]int{}

+ for _, line := range strings.Split(zoneTab, "\n") {

+ if line == "" || strings.HasPrefix(line, "#") {

+ continue

+ }

+ f := strings.Split(line, "\t")

+ if len(f) < 3 {

+ continue

+ }

+ p, ok := parseISO6709(f[1])

+ if !ok {

+ continue

+ }

+ zonePoints[strings.ToLower(f[2])] = p

+ cc := strings.ToUpper(f[0])

+ rowsPerCC[cc]++

+ countryOne[cc] = p

+ }

+ zoneLinks = map[string]string{}

+ for _, line := range strings.Split(linksTxt, "\n") {

+ f := strings.Fields(line)

+ if len(f) == 2 {

+ zoneLinks[strings.ToLower(f[1])] = strings.ToLower(f[0])

+ }

+// ZonePoint maps an IANA zone name to its principal location, following

+// tzdata links (at most 4 hops). It refuses anything that is not a place.

+func ZonePoint(name string) (Point, bool) {

+ tzOnce.Do(loadTZ)

+ name = strings.TrimSpace(name)

+ if len(name) > 64 || !zoneShape.MatchString(name) {

+ return Point{}, false

+ }

+ low := strings.ToLower(name)

+ if notAPlace[low] || strings.HasPrefix(low, "etc/") {

+ return Point{}, false

+ }

+ return resolveLinks(low, zoneLinks, zonePoints)

+func resolveLinks(name string, links map[string]string, points map[string]Point) (Point, bool) {

+ for hop := 0; hop <= 4; hop++ {

+ if p, ok := points[name]; ok {

+ return p, true

+ }

+ next, ok := links[name]

+ if !ok {

+ return Point{}, false

+ }

+ name = next

+ }

+ return Point{}, false

+// countryOverride names the principal zone of every country with more

+// than one zone.tab row (tzdata 2026b). TestCountryOverridesCoverEvery

+// MultiZoneCountry fails when a refresh adds a multi-row country.

+var countryOverride = map[string]string{

+ "AQ": "Antarctica/McMurdo", "AR": "America/Argentina/Buenos_Aires",

+ "AU": "Australia/Sydney", "BR": "America/Sao_Paulo", "CA": "America/Toronto",

+ "CD": "Africa/Kinshasa", "CL": "America/Santiago", "CN": "Asia/Shanghai",

+ "CY": "Asia/Nicosia", "DE": "Europe/Berlin", "EC": "America/Guayaquil",

+ "ES": "Europe/Madrid", "FM": "Pacific/Pohnpei", "GL": "America/Nuuk",

+ "ID": "Asia/Jakarta", "KI": "Pacific/Tarawa", "KZ": "Asia/Almaty",

+ "MH": "Pacific/Majuro", "MN": "Asia/Ulaanbaatar", "MX": "America/Mexico_City",

+ "MY": "Asia/Kuala_Lumpur", "NZ": "Pacific/Auckland", "PF": "Pacific/Tahiti",

+ "PG": "Pacific/Port_Moresby", "PS": "Asia/Gaza", "PT": "Europe/Lisbon",

+ "RU": "Europe/Moscow", "UA": "Europe/Kyiv", "UM": "Pacific/Wake",

+ "US": "America/New_York", "UZ": "Asia/Tashkent",

+// CountryPoint maps an ISO 3166-1 alpha-2 code to a point: its only

+// zone.tab row, or its override's zone.

+func CountryPoint(iso2 string) (Point, bool) {

+ tzOnce.Do(loadTZ)

+ cc := strings.ToUpper(strings.TrimSpace(iso2))

+ if zone, ok := countryOverride[cc]; ok {

+ return ZonePoint(zone)

+ }

+ if rowsPerCC[cc] == 1 {

+ return countryOne[cc], true

+ }

+ return Point{}, false

+func zoneRowsPerCountry() map[string]int { tzOnce.Do(loadTZ); return rowsPerCC }

+// parseISO6709 reads zone.tab's ±DDMM±DDDMM or ±DDMMSS±DDDMMSS.

+func parseISO6709(s string) (Point, bool) {

+ i := strings.IndexAny(s[1:], "+-") + 1

+ if i <= 0 {

+ return Point{}, false

+ }

+ lat, ok1 := dms(s[:i], 2)

+ lon, ok2 := dms(s[i:], 3)

+ return Point{lat, lon}, ok1 && ok2

+func dms(s string, degDigits int) (float64, bool) {

+ sign := 1.0

+ if s[0] == '-' {

+ sign = -1

+ }

+ d := s[1:]

+ if len(d) != degDigits+2 && len(d) != degDigits+4 {

+ return 0, false

+ }

+ deg, err1 := strconv.Atoi(d[:degDigits])

+ min, err2 := strconv.Atoi(d[degDigits : degDigits+2])

+ sec := 0

+ var err3 error

+ if len(d) == degDigits+4 {

+ sec, err3 = strconv.Atoi(d[degDigits+2:])

+ }

+ if err1 != nil || err2 != nil || err3 != nil {

+ return 0, false

+ }

+ return sign * (float64(deg) + float64(min)/60 + float64(sec)/3600), true

diff --git a/internal/geo/tz_test.go b/internal/geo/tz_test.go

new file mode 100644

index 000000000..cf157808e

--- /dev/null

+++ b/internal/geo/tz_test.go

@@ -0,0 +1,93 @@

+// internal/geo/tz_test.go

+package geo

+import (

+ "strings"

+ "testing"

+func TestZonePoint(t *testing.T) {

+ mapped := []string{

+ "Europe/London", "Europe/Dublin", "Europe/Amsterdam",

+ "Asia/Kolkata", "Asia/Calcutta",

+ "America/Argentina/Buenos_Aires", "europe/london",

+ }

+ for _, z := range mapped {

+ if _, ok := ZonePoint(z); !ok {

+ t.Errorf("ZonePoint(%q) unmapped, want a point", z)

+ }

+ a, _ := ZonePoint("Asia/Calcutta")

+ b, _ := ZonePoint("Asia/Kolkata")

+ if a != b {

+ t.Errorf("Asia/Calcutta %v != Asia/Kolkata %v; the link must resolve to one point", a, b)

+ }

+ unmapped := []string{

+ "", "UTC", "Etc/UTC", "Etc/GMT+5", "GMT", "UCT", "Universal", "Zulu",

+ "Factory", "Local", "localtime", "posixrules", "../etc/passwd",

+ "Europe/London/Extra/Deep", strings.Repeat("A", 65), "Nowhere/Atlantis",

+ }

+ for _, z := range unmapped {

+ if p, ok := ZonePoint(z); ok {

+ t.Errorf("ZonePoint(%q) = %v, want unmappable", z, p)

+ }

+ l, _ := ZonePoint("Europe/London")

+ if l.Lat < 51 || l.Lat > 52 || l.Lon > 0.5 || l.Lon < -0.5 {

+ t.Errorf("Europe/London = %v, want about 51.5, -0.12", l)

+ }

+// A link cycle must terminate (at most 4 hops) rather than hang.

+func TestZonePointLinkLoopTerminates(t *testing.T) {

+ links := map[string]string{"a/x": "a/y", "a/y": "a/x"}

+ if _, ok := resolveLinks("a/x", links, map[string]Point{}); ok {

+ t.Fatal("a link loop resolved to a point")

+ }

+// Every country with more than one zone.tab row needs an override naming

+// its principal zone: a tzdata refresh that gives a country a second row

+// fails here instead of silently averaging a continent (spec §6.2).

+func TestCountryOverridesCoverEveryMultiZoneCountry(t *testing.T) {

+ for cc, n := range zoneRowsPerCountry() {

+ if n < 2 {

+ continue

+ }

+ zone, ok := countryOverride[cc]

+ if !ok {

+ t.Errorf("country %s has %d zone.tab rows and no override", cc, n)

+ continue

+ }

+ if _, ok := ZonePoint(zone); !ok {

+ t.Errorf("override for %s names %q, which is not in zone.tab", cc, zone)

+ }

+ for cc := range countryOverride {

+ if zoneRowsPerCountry()[cc] < 2 {

+ t.Errorf("override for %s is unused: it has fewer than two rows", cc)

+ }

+func TestCountryPoint(t *testing.T) {

+ for _, cc := range []string{"GB", "IE", "US", "AU", "IN", "gb"} {

+ if _, ok := CountryPoint(cc); !ok {

+ t.Errorf("CountryPoint(%q) unmapped", cc)

+ }

+ us, _ := CountryPoint("US")

+ ny, _ := ZonePoint("America/New_York")

+ if us != ny {

+ t.Errorf("US = %v, want its principal zone New York %v", us, ny)

+ }

+ if _, ok := CountryPoint("ZZ"); ok {

+ t.Error("CountryPoint(ZZ) mapped")

+ }

+func TestTZDataVersion(t *testing.T) {

+ if v := TZDataVersion(); v == "" || strings.ContainsAny(v, " \n") {

+ t.Fatalf("TZDataVersion = %q", v)

+ }

diff --git a/scripts/update-tzgeo.sh b/scripts/update-tzgeo.sh

new file mode 100755

index 000000000..fe9ae7457

--- /dev/null

+++ b/scripts/update-tzgeo.sh

@@ -0,0 +1,32 @@

+#!/usr/bin/env bash

+# scripts/update-tzgeo.sh <version>, e.g. 2026b

+# Refreshes internal/geo/data from one IANA tzdata release

+# (nearest-region spec §6.2). zone.tab carries the coordinates; the Link

+# lines resolve the old names browsers still report (Asia/Calcutta). Run it

+# as a release-checklist step beside the Go toolchain bump; a stale table

+# only misses zone names newer than it, and those fall through to IP.

+set -euo pipefail

+v="${1:?usage: update-tzgeo.sh <tzdata version, e.g. 2026b>}"

+here="$(cd "$(dirname "$0")/.." && pwd)"

+out="$here/internal/geo/data"

+work="$(mktemp -d "${TMPDIR:-/tmp}/tzgeo.XXXXXX")"

+trap 'rm -rf "$work"' EXIT

+base="https://data.iana.org/time-zones/releases"

+curl -fsSL -o "$work/tzdata.tar.gz" "$base/tzdata$v.tar.gz"

+curl -fsSL -o "$work/tzdata.tar.gz.asc" "$base/tzdata$v.tar.gz.asc"

+if command -v gpg >/dev/null; then

+ gpg --verify "$work/tzdata.tar.gz.asc" "$work/tzdata.tar.gz"

+else

+ echo "gpg not found: signature NOT checked" >&2

+ exit 1

+fi

+tar -xzf "$work/tzdata.tar.gz" -C "$work"

+mkdir -p "$out"

+cp "$work/zone.tab" "$out/zone.tab"

+awk '$1 == "Link" { print $2, $3 }' \

+ "$work"/africa "$work"/antarctica "$work"/asia "$work"/australasia \

+ "$work"/backward "$work"/etcetera "$work"/europe "$work"/northamerica \

+ "$work"/southamerica | sort -u > "$out/links.txt"

+printf '%s\n' "$v" > "$out/VERSION"

+echo "internal/geo/data refreshed to tzdata $v"