YAML file that maps IANA time zones (from TZInfo Gem as of December 2024) to Rails ActiveSupport::TimeZone names.

iana_to_rails_time_zone.yml

# Key: IANA Time Zone name, Value: Rails Time Zone name (ActiveSupport::TimeZone)
Africa/Abidjan: Monrovia
Africa/Accra: Monrovia
Africa/Addis_Ababa: Nairobi
Africa/Algiers: West Central Africa
Africa/Asmara: Kuwait
Africa/Asmera: Nairobi
Africa/Bamako: Monrovia
Africa/Bangui: West Central Africa
Africa/Banjul: Monrovia
Africa/Bissau: Monrovia
Africa/Blantyre: Harare
Africa/Brazzaville: West Central Africa
Africa/Bujumbura: Harare
Africa/Cairo: Cairo
Africa/Casablanca: Casablanca
Africa/Ceuta: Brussels
Africa/Conakry: Monrovia
Africa/Dakar: Monrovia
Africa/Dar_es_Salaam: Nairobi
Africa/Djibouti: Nairobi
Africa/Douala: West Central Africa
Africa/El_Aaiun: Casablanca
Africa/Freetown: Monrovia
Africa/Gaborone: Harare
Africa/Harare: Harare
Africa/Johannesburg: Pretoria
Africa/Juba: Harare
Africa/Kampala: Nairobi
Africa/Khartoum: Harare
Africa/Kigali: Harare
Africa/Kinshasa: West Central Africa
Africa/Lagos: West Central Africa
Africa/Libreville: West Central Africa
Africa/Lome: Monrovia
Africa/Luanda: West Central Africa
Africa/Lubumbashi: Harare
Africa/Lusaka: Harare
Africa/Malabo: West Central Africa
Africa/Maputo: Harare
Africa/Maseru: Harare
Africa/Mbabane: Harare
Africa/Mogadishu: Nairobi
Africa/Monrovia: Monrovia
Africa/Nairobi: Nairobi
Africa/Ndjamena: West Central Africa
Africa/Niamey: West Central Africa
Africa/Nouakchott: Monrovia
Africa/Ouagadougou: Monrovia
Africa/Porto-Novo: West Central Africa
Africa/Sao_Tome: Monrovia
Africa/Timbuktu: UTC
Africa/Tripoli: Pretoria
Africa/Tunis: West Central Africa
Africa/Windhoek: Harare
America/Adak: Hawaii  # no proper ActiveSupport::TimeZone mapping - s/b Hawaii time but observes DST
America/Anchorage: Alaska
America/Anguilla: Georgetown
America/Antigua: Georgetown
America/Araguaina: Brasilia
America/Argentina/Buenos_Aires: Buenos Aires
America/Argentina/Catamarca: Buenos Aires
America/Argentina/ComodRivadavia: Buenos Aires
America/Argentina/Cordoba: Buenos Aires
America/Argentina/Jujuy: Buenos Aires
America/Argentina/La_Rioja: Buenos Aires
America/Argentina/Mendoza: Buenos Aires
America/Argentina/Rio_Gallegos: Buenos Aires
America/Argentina/Salta: Buenos Aires
America/Argentina/San_Juan: Buenos Aires
America/Argentina/San_Luis: Buenos Aires
America/Argentina/Tucuman: Buenos Aires
America/Argentina/Ushuaia: Buenos Aires
America/Aruba: Georgetown
America/Asuncion: Buenos Aires # no proper ActiveSupport::TimeZone mapping - has winter DST
America/Atikokan: Bogota
America/Atka: Hawaii # no proper ActiveSupport::TimeZone mapping - s/b Hawaii time but observes DST
America/Bahia_Banderas: Guadalajara
America/Bahia: Brasilia
America/Barbados: Georgetown
America/Belem: Brasilia
America/Belize: Central America
America/Blanc-Sablon: Georgetown
America/Boa_Vista: Georgetown
America/Bogota: Bogota
America/Boise: Mountain Time (US & Canada)
America/Buenos_Aires: Buenos Aires
America/Cambridge_Bay: Mountain Time (US & Canada)
America/Campo_Grande: La Paz
America/Cancun: Bogota
America/Caracas: Caracas
America/Catamarca: Buenos Aires
America/Cayenne: Brasilia
America/Cayman: Bogota
America/Chicago: Central Time (US & Canada)
America/Chihuahua: Chihuahua
America/Ciudad_Juarez: Mountain Time (US & Canada)
America/Coral_Harbour: Bogota
America/Cordoba: Buenos Aires
America/Costa_Rica: Central America
America/Creston: Arizona
America/Cuiaba: La Paz
America/Curacao: Georgetown
America/Danmarkshavn: UTC
America/Dawson_Creek: Arizona
America/Dawson: Arizona
America/Denver: Mountain Time (US & Canada)
America/Detroit: Eastern Time (US & Canada)
America/Dominica: Georgetown
America/Edmonton: Mountain Time (US & Canada)
America/Eirunepe: Bogota
America/El_Salvador: Central America
America/Ensenada: Tijuana
America/Fort_Nelson: Arizona
America/Fort_Wayne: Eastern Time (US & Canada)
America/Fortaleza: Brasilia
America/Glace_Bay: Atlantic Time (Canada)
America/Godthab: Greenland
America/Goose_Bay: Atlantic Time (Canada)
America/Grand_Turk: Eastern Time (US & Canada)
America/Grenada: Georgetown
America/Guadeloupe: Georgetown
America/Guatemala: Central America
America/Guayaquil: Bogota
America/Guyana: Georgetown
America/Halifax: Atlantic Time (Canada)
America/Havana: Eastern Time (US & Canada)
America/Hermosillo: Arizona
America/Indiana/Indianapolis: Indiana (East)
America/Indiana/Knox: Central Time (US & Canada)
America/Indiana/Marengo: Indiana (East)
America/Indiana/Petersburg: Eastern Time (US & Canada)
America/Indiana/Tell_City: Central Time (US & Canada)
America/Indiana/Vevay: Indiana (East)
America/Indiana/Vincennes: Eastern Time (US & Canada)
America/Indiana/Winamac: Eastern Time (US & Canada)
America/Indianapolis: Indiana (East)
America/Inuvik: Mountain Time (US & Canada)
America/Iqaluit: Eastern Time (US & Canada)
America/Jamaica: Bogota
America/Jujuy: Buenos Aires
America/Juneau: Alaska
America/Kentucky/Louisville: Eastern Time (US & Canada)
America/Kentucky/Monticello: Eastern Time (US & Canada)
America/Knox_IN: Central Time (US & Canada)
America/Kralendijk: Georgetown
America/La_Paz: La Paz
America/Lima: Lima
America/Los_Angeles: Pacific Time (US & Canada)
America/Louisville: Eastern Time (US & Canada)
America/Lower_Princes: Georgetown
America/Maceio: Brasilia
America/Managua: Central America
America/Manaus: Georgetown
America/Marigot: Georgetown
America/Martinique: Georgetown
America/Matamoros: Central Time (US & Canada)
America/Mazatlan: Mazatlan
America/Mendoza: Buenos Aires
America/Menominee: Central Time (US & Canada)
America/Merida: Guadalajara
America/Metlakatla: Alaska
America/Mexico_City: Mexico City
America/Miquelon: Atlantic Time (Canada) # no proper ActiveSupport::TimeZone mapping - s/b UTC-3 with DST
America/Moncton: Atlantic Time (Canada)
America/Monterrey: Monterrey
America/Montevideo: Montevideo
America/Montreal: Eastern Time (US & Canada)
America/Montserrat: Georgetown
America/Nassau: Eastern Time (US & Canada)
America/New_York: Eastern Time (US & Canada)
America/Nipigon: Eastern Time (US & Canada)
America/Nome: Alaska
America/Noronha: Mid-Atlantic
America/North_Dakota/Beulah: Central Time (US & Canada)
America/North_Dakota/Center: Central Time (US & Canada)
America/North_Dakota/New_Salem: Central Time (US & Canada)
America/Nuuk: Greenland
America/Ojinaga: Central Time (US & Canada)
America/Panama: Bogota
America/Pangnirtung: Eastern Time (US & Canada)
America/Paramaribo: Brasilia
America/Phoenix: Arizona
America/Port_of_Spain: Georgetown
America/Port-au-Prince: Eastern Time (US & Canada)
America/Porto_Acre: Bogota
America/Porto_Velho: Georgetown
America/Puerto_Rico: Georgetown
America/Punta_Arenas: Buenos Aires
America/Rainy_River: Central Time (US & Canada)
America/Rankin_Inlet: Central Time (US & Canada)
America/Recife: Brasilia
America/Regina: Saskatchewan
America/Resolute: Central Time (US & Canada)
America/Rio_Branco: Bogota
America/Rosario: Buenos Aires
America/Santa_Isabel: Tijuana
America/Santarem: Brasilia
America/Santiago: Santiago
America/Santo_Domingo: Georgetown
America/Sao_Paulo: Brasilia
America/Scoresbysund: Greenland
America/Shiprock: Mountain Time (US & Canada)
America/Sitka: Alaska
America/St_Barthelemy: Georgetown
America/St_Johns: Newfoundland
America/St_Kitts: Georgetown
America/St_Lucia: Georgetown
America/St_Thomas: Georgetown
America/St_Vincent: Georgetown
America/Swift_Current: Saskatchewan
America/Tegucigalpa: Central America
America/Thule: Atlantic Time (Canada)
America/Thunder_Bay: Eastern Time (US & Canada)
America/Tijuana: Tijuana
America/Toronto: Eastern Time (US & Canada)
America/Tortola: Georgetown
America/Vancouver: Pacific Time (US & Canada)
America/Virgin: Puerto Rico
America/Whitehorse: Arizona
America/Winnipeg: Central Time (US & Canada)
America/Yakutat: Alaska
America/Yellowknife: Mountain Time (US & Canada)
Antarctica/Casey: Perth
Antarctica/Davis: Bangkok
Antarctica/DumontDUrville: Guam
Antarctica/Macquarie: Sydney
Antarctica/Mawson: Karachi
Antarctica/McMurdo: Auckland
Antarctica/Palmer: Brasilia
Antarctica/Rothera: Brasilia
Antarctica/South_Pole: Wellington
Antarctica/Syowa: Nairobi
Antarctica/Troll: West Central Africa # no proper ActiveSupport::TimeZone mapping - shifts 2 hrs with southern DST
Antarctica/Vostok: Karachi
Arctic/Longyearbyen: Amsterdam
Asia/Aden: Kuwait
Asia/Almaty: Almaty
Asia/Amman: Istanbul
Asia/Anadyr: Kamchatka
Asia/Aqtau: Astana
Asia/Aqtobe: Astana
Asia/Ashgabat: Astana
Asia/Ashkhabad: Astana
Asia/Atyrau: Astana
Asia/Baghdad: Baghdad
Asia/Bahrain: Kuwait
Asia/Baku: Baku
Asia/Bangkok: Bangkok
Asia/Barnaul: Novosibirsk
Asia/Beirut: Cairo
Asia/Bishkek: Dhaka
Asia/Brunei: Kuala Lumpur
Asia/Calcutta: Kolkata
Asia/Chita: Yakutsk
Asia/Choibalsan: Ulaanbaatar
Asia/Chongqing: Chongqing
Asia/Chungking: Chongqing
Asia/Chungking: Chongqing
Asia/Colombo: Sri Jayawardenepura
Asia/Dacca: Dhaka
Asia/Damascus: Baghdad
Asia/Dhaka: Dhaka
Asia/Dili: Osaka
Asia/Dubai: Abu Dhabi
Asia/Dushanbe: Almaty
Asia/Famagusta: Jerusalem
Asia/Gaza: Jerusalem
Asia/Harbin: Chongqing
Asia/Harbin: Chongqing
Asia/Hebron: Jerusalem
Asia/Ho_Chi_Minh: Hanoi
Asia/Hong_Kong: Hong Kong
Asia/Hovd: Bangkok
Asia/Irkutsk: Irkutsk
Asia/Istanbul: Istanbul
Asia/Jakarta: Jakarta
Asia/Jayapura: Osaka
Asia/Jerusalem: Jerusalem
Asia/Kabul: Kabul
Asia/Kamchatka: Kamchatka
Asia/Karachi: Karachi
Asia/Kashgar: Urumqi
Asia/Kathmandu: Kathmandu
Asia/Katmandu: Kathmandu
Asia/Khandyga: Yakutsk
Asia/Kolkata: Kolkata
Asia/Krasnoyarsk: Krasnoyarsk
Asia/Kuala_Lumpur: Kuala Lumpur
Asia/Kuching: Kuala Lumpur
Asia/Kuwait: Kuwait
Asia/Macao: Chongqing
Asia/Macau: Beijing
Asia/Magadan: Magadan
Asia/Makassar: Kuala Lumpur
Asia/Manila: Kuala Lumpur
Asia/Muscat: Muscat
Asia/Nicosia: Athens
Asia/Novokuznetsk: Krasnoyarsk
Asia/Novosibirsk: Novosibirsk
Asia/Omsk: Urumqi
Asia/Oral: Astana
Asia/Phnom_Penh: Bangkok
Asia/Pontianak: Bangkok
Asia/Pyongyang: Seoul
Asia/Qatar: Kuwait
Asia/Qostanay: Astana
Asia/Qyzylorda: Astana
Asia/Rangoon: Rangoon
Asia/Riyadh: Riyadh
Asia/Saigon: Bangkok
Asia/Sakhalin: Magadan
Asia/Samarkand: Almaty
Asia/Seoul: Seoul
Asia/Shanghai: Beijing
Asia/Singapore: Singapore
Asia/Srednekolymsk: Srednekolymsk
Asia/Taipei: Taipei
Asia/Tashkent: Tashkent
Asia/Tbilisi: Tbilisi
Asia/Tehran: Tehran
Asia/Tel_Aviv: Jerusalem
Asia/Thimbu: Dhaka
Asia/Thimphu: Dhaka
Asia/Tokyo: Tokyo
Asia/Tomsk: Novosibirsk
Asia/Ujung_Pandang: Singapore
Asia/Ulaanbaatar: Ulaanbaatar
Asia/Ulan_Bator: Ulaanbaatar
Asia/Urumqi: Urumqi
Asia/Ust-Nera: Vladivostok
Asia/Vientiane: Bangkok
Asia/Vladivostok: Vladivostok
Asia/Yakutsk: Yakutsk
Asia/Yangon: Rangoon
Asia/Yekaterinburg: Ekaterinburg
Asia/Yerevan: Yerevan
Atlantic/Azores: Azores
Atlantic/Bermuda: Atlantic Time (Canada)
Atlantic/Canary: Lisbon
Atlantic/Cape_Verde: Cape Verde Is.
Atlantic/Faeroe: London
Atlantic/Faroe: Lisbon
Atlantic/Jan_Mayen: Berlin
Atlantic/Madeira: Lisbon
Atlantic/Reykjavik: Monrovia
Atlantic/South_Georgia: Mid-Atlantic
Atlantic/St_Helena: Monrovia
Atlantic/Stanley: Brasilia
Australia/ACT: Sydney
Australia/Adelaide: Adelaide
Australia/Brisbane: Brisbane
Australia/Broken_Hill: Adelaide
Australia/Canberra: Sydney
Australia/Currie: Hobart
Australia/Darwin: Darwin
Australia/Eucla: Perth # UTC +8:45; not in ActiveSupport::TimeZone
Australia/Hobart: Hobart
Australia/LHI: New Caledonia # shifts 30 mins with southern DST; not in ActiveSupport::TimeZone
Australia/Lindeman: Brisbane
Australia/Lord_Howe: New Caledonia # shifts 30 mins with southern DST; not in ActiveSupport::TimeZone
Australia/Melbourne: Melbourne
Australia/North: Darwin
Australia/NSW: Sydney
Australia/Perth: Perth
Australia/Queensland: Port Moresby
Australia/South: Adelaide
Australia/Sydney: Sydney
Australia/Tasmania: Sydney
Australia/Victoria: Sydney
Australia/West: Perth
Australia/Yancowinna: Adelaide
Brazil/Acre: Lima
Brazil/DeNoronha: Mid-Atlantic
Brazil/East: Brasilia
Brazil/West: La Paz
Canada/Atlantic: Atlantic Time (Canada)
Canada/Central: Central Time (US & Canada)
Canada/Eastern: Eastern Time (US & Canada)
Canada/Mountain: Mountain Time (US & Canada)
Canada/Newfoundland: Newfoundland
Canada/Pacific: Pacific Time (US & Canada)
Canada/Saskatchewan: Saskatchewan
Canada/Yukon: Arizona
CET: Berlin
Chile/Continental: Santiago
Chile/EasterIsland: Mexico City # no proper ActiveSupport::TimeZone mapping - s/b UTC-6 with southern DST
CST6CDT: Central Time (US & Canada)
Cuba: Eastern Time (US & Canada)
EET: Riga
Egypt: Cairo
Eire: Dublin
EST: Bogota
EST5EDT: Eastern Time (US & Canada)
Etc/GMT-0: UTC
Etc/GMT-1: West Central Africa
Etc/GMT-10: Guam
Etc/GMT-11: Solomon Is.
Etc/GMT-12: Marshall Is.
Etc/GMT-13: "Nuku'alofa"
Etc/GMT-14: "Nuku'alofa" # not in ActiveSupport::TimeZone
Etc/GMT-2: Harare
Etc/GMT-3: Nairobi
Etc/GMT-4: Abu Dhabi
Etc/GMT-5: Karachi
Etc/GMT-6: Dhaka
Etc/GMT-7: Bangkok
Etc/GMT-8: Kuala Lumpur
Etc/GMT-9: Osaka
Etc/GMT: UTC
Etc/GMT+0: UTC
Etc/GMT+1: Cape Verde Is.
Etc/GMT+10: Hawaii
Etc/GMT+11: Midway Island
Etc/GMT+12: International Date Line West
Etc/GMT+2: Mid-Atlantic
Etc/GMT+3: Brasilia
Etc/GMT+4: Georgetown
Etc/GMT+5: Bogota
Etc/GMT+6: Central America
Etc/GMT+7: Arizona
Etc/GMT+8: Alaska # no proper ActiveSupport::TimeZone mapping - s/b UTC-8 without DST
Etc/GMT+9: Alaska # no proper ActiveSupport::TimeZone mapping - s/b UTC-9 without DST
Etc/GMT0: UTC
Etc/Greenwich: UTC
Etc/UCT: UTC
Etc/Universal: UTC
Etc/UTC: UTC
Etc/Zulu: UTC
Europe/Amsterdam: Amsterdam
Europe/Andorra: Amsterdam
Europe/Astrakhan: Samara
Europe/Athens: Athens
Europe/Belfast: London
Europe/Belgrade: Belgrade
Europe/Berlin: Berlin
Europe/Bratislava: Bratislava
Europe/Brussels: Brussels
Europe/Bucharest: Bucharest
Europe/Budapest: Budapest
Europe/Busingen: Amsterdam
Europe/Chisinau: Athens
Europe/Copenhagen: Copenhagen
Europe/Dublin: Dublin
Europe/Gibraltar: Amsterdam
Europe/Guernsey: London
Europe/Helsinki: Helsinki
Europe/Isle_of_Man: London
Europe/Istanbul: Istanbul
Europe/Jersey: London
Europe/Kaliningrad: Kaliningrad
Europe/Kiev: Kyiv
Europe/Kirov: Moscow
Europe/Kyiv: Kyiv
Europe/Lisbon: Lisbon
Europe/Ljubljana: Ljubljana
Europe/London: London
Europe/Luxembourg: Amsterdam
Europe/Madrid: Madrid
Europe/Malta: Amsterdam
Europe/Mariehamn: Helsinki
Europe/Minsk: Minsk
Europe/Monaco: Amsterdam
Europe/Moscow: Moscow
Europe/Nicosia: Sofia
Europe/Oslo: Amsterdam
Europe/Paris: Paris
Europe/Podgorica: Belgrade
Europe/Prague: Prague
Europe/Riga: Riga
Europe/Rome: Rome
Europe/Samara: Samara
Europe/San_Marino: Amsterdam
Europe/Sarajevo: Sarajevo
Europe/Saratov: Samara
Europe/Simferopol: Moscow
Europe/Skopje: Skopje
Europe/Sofia: Sofia
Europe/Stockholm: Stockholm
Europe/Tallinn: Tallinn
Europe/Tirane: Belgrade
Europe/Tiraspol: Kyiv
Europe/Ulyanovsk: Samara
Europe/Uzhgorod: Helsinki
Europe/Vaduz: Amsterdam
Europe/Vatican: Amsterdam
Europe/Vienna: Vienna
Europe/Vilnius: Vilnius
Europe/Volgograd: Volgograd
Europe/Warsaw: Warsaw
Europe/Zagreb: Zagreb
Europe/Zaporozhye: Helsinki
Europe/Zurich: Amsterdam
GB-Eire: London
GB: London
GMT-0: UTC
GMT: UTC
GMT+0: UTC
GMT0: UTC
Greenwich: UTC
Hongkong: Singapore
HST: Hawaii
Iceland: UTC
Indian/Antananarivo: Nairobi
Indian/Chagos: Dhaka
Indian/Christmas: Bangkok
Indian/Cocos: Rangoon
Indian/Comoro: Nairobi
Indian/Kerguelen: Karachi
Indian/Mahe: Abu Dhabi
Indian/Maldives: Karachi
Indian/Mauritius: Abu Dhabi
Indian/Mayotte: Nairobi
Indian/Reunion: Abu Dhabi
Iran: Tehran
Israel: Jerusalem
Jamaica: Bogota
Japan: Tokyo
Kwajalein: Kamchatka
Libya: Pretoria
MET: Belgrade
Mexico/BajaNorte: Tijuana
Mexico/BajaSur: Mazatlan
Mexico/General: Mexico City
MST: Arizona
MST7MDT: Mountain Time (US & Canada)
Navajo: Mountain Time (US & Canada)
NZ-CHAT: Chatham Is.
NZ: Wellington
Pacific/Apia: Samoa
Pacific/Auckland: Auckland
Pacific/Bougainville: Solomon Is.
Pacific/Chatham: Chatham Is.
Pacific/Chuuk: Port Moresby
Pacific/Easter: Mexico City # no proper ActiveSupport::TimeZone mapping - s/b UTC-6 with southern DST
Pacific/Efate: Solomon Is.
Pacific/Enderbury: "Nuku'alofa"
Pacific/Fakaofo: Tokelau Is.
Pacific/Fiji: Fiji
Pacific/Funafuti: Marshall Is.
Pacific/Galapagos: Central America
Pacific/Gambier: Hawaii # no proper ActiveSupport::TimeZone mapping - s/b UTC-9 without DST
Pacific/Guadalcanal: Solomon Is.
Pacific/Guam: Guam
Pacific/Honolulu: Hawaii
Pacific/Johnston: Hawaii
Pacific/Kanton: Nuku'alofa
Pacific/Kiritimati: Chatham Is. # no proper ActiveSupport::TimeZone mapping - s/b UTC+14
Pacific/Kosrae: Solomon Is.
Pacific/Kwajalein: Marshall Is.
Pacific/Majuro: Marshall Is.
Pacific/Marquesas: Hawaii # no proper ActiveSupport::TimeZone mapping - s/b UTC-9.5
Pacific/Midway: Midway Island
Pacific/Nauru: Marshall Is.
Pacific/Niue: Midway Island
Pacific/Norfolk: New Caledonia # no proper ActiveSupport::TimeZone mapping - s/b UTC+12 with southern DST
Pacific/Noumea: New Caledonia
Pacific/Pago_Pago: American Samoa
Pacific/Palau: Osaka
Pacific/Pitcairn: Alaska # no proper ActiveSupport::TimeZone mapping - observes southern DST
Pacific/Pohnpei: New Caledonia
Pacific/Ponape: Solomon Is.
Pacific/Port_Moresby: Port Moresby
Pacific/Rarotonga: Hawaii
Pacific/Saipan: Guam
Pacific/Samoa: American Samoa
Pacific/Tahiti: Hawaii
Pacific/Tarawa: Marshall Is.
Pacific/Tongatapu: "Nuku'alofa"
Pacific/Truk: Guam
Pacific/Wake: Marshall Is.
Pacific/Wallis: Marshall Is.
Pacific/Yap: Port Moresby
Poland: Belgrade
Portugal: Lisbon
PRC: Chongqing
PST8PDT: Pacific Time (US & Canada)
ROC: Singapore
ROK: Seoul
Singapore: Singapore
Turkey: Istanbul
UCT: UTC
Universal: UTC
US/Alaska: Alaska
US/Aleutian: Hawaii # no proper ActiveSupport::TimeZone mapping - Hawaii offset but observes DST
US/Arizona: Arizona
US/Central: Central Time (US & Canada)
US/East-Indiana: Indiana (East)
US/Eastern: Eastern Time (US & Canada)
US/Hawaii: Hawaii
US/Indiana-Starke: Central Time (US & Canada)
US/Michigan: Eastern Time (US & Canada)
US/Mountain: Mountain Time (US & Canada)
US/Pacific: Pacific Time (US & Canada)
US/Samoa: American Samoa
UTC: UTC
W-SU: Moscow
WET: London
Zulu: UTC

This YAML file was created to capture mappings between IANA time zone names and the time zone names provided by Ruby on Rails' ActiveSupport::TimeZone.

It is not intended to capture the base mappings that are provided in ActiveSupport itself.

No guarantees are made as to the accuracy of this list. I ran basic checks to ensure the offset and observance of Daylight Savings Time was consistent between the IANA zone and the Rails zone it maps to. Because Rails includes a smaller subset of timezones, there are some IANA time zones that cannot be accurately mapped to a Rails time zone at all - I've mapped these to a "nearest approximation" and included a comment - this affects 15 fairly small IANA timezones. I did not check to ensure the dates of DST changes are consistent between the IANA and Rails time zones.

Credit to two older gists (1, 2) that I used as starting points.

Corrections and feedback welcomed.

People may also wish to reference a very similar YAML that I found after creating this, which is maintained by Shopify in their Worldwide gem.

I think this list has a couple minor improvements over the shopify list, but they are so small that most will never notice, and Shopify's library is likely to be better maintained over time.