valid TZ Database Values & Friendly Names (supported by Rails ActiveSupport::TimeZone class)

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Valid TZ Database Values:

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

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Rails Friendly Names

* UTC -11:00 *
American Samoa
International Date Line West
Midway Island

* UTC -10:00 *
Hawaii

* UTC -09:00 *
Alaska

* UTC -08:00 *
Pacific Time (US & Canada)
Tijuana

* UTC -07:00 *
Arizona
Chihuahua
Mazatlan
Mountain Time (US & Canada)

* UTC -06:00 *
Central America
Central Time (US & Canada)
Guadalajara
Mexico City
Monterrey
Saskatchewan

* UTC -05:00 *
Bogota
Eastern Time (US & Canada)
Indiana (East)
Lima
Quito

* UTC -04:00 *
Atlantic Time (Canada)
Caracas
Georgetown
La Paz
Santiago

* UTC -03:30 *
Newfoundland

* UTC -03:00 *
Brasilia
Buenos Aires
Greenland
Montevideo

* UTC -02:00 *
Mid-Atlantic

* UTC -01:00 *
Azores
Cape Verde Is.

* UTC +00:00 *
Casablanca
Dublin
Edinburgh
Lisbon
London
Monrovia
UTC

* UTC +01:00 *
Amsterdam
Belgrade
Berlin
Bern
Bratislava
Brussels
Budapest
Copenhagen
Ljubljana
Madrid
Paris
Prague
Rome
Sarajevo
Skopje
Stockholm
Vienna
Warsaw
West Central Africa
Zagreb

* UTC +02:00 *
Athens
Bucharest
Cairo
Harare
Helsinki
Jerusalem
Kaliningrad
Kyiv
Pretoria
Riga
Sofia
Tallinn
Vilnius

* UTC +03:00 *
Baghdad
Istanbul
Kuwait
Minsk
Moscow
Nairobi
Riyadh
St. Petersburg

* UTC +03:30 *
Tehran

* UTC +04:00 *
Abu Dhabi
Baku
Muscat
Samara
Tbilisi
Volgograd
Yerevan

* UTC +04:30 *
Kabul

* UTC +05:00 *
Ekaterinburg
Islamabad
Karachi
Tashkent

* UTC +05:30 *
Chennai
Kolkata
Mumbai
New Delhi
Sri Jayawardenepura

* UTC +05:45 *
Kathmandu

* UTC +06:00 *
Almaty
Astana
Dhaka
Urumqi

* UTC +06:30 *
Rangoon

* UTC +07:00 *
Bangkok
Hanoi
Jakarta
Krasnoyarsk
Novosibirsk

* UTC +08:00 *
Beijing
Chongqing
Hong Kong
Irkutsk
Kuala Lumpur
Perth
Singapore
Taipei
Ulaanbaatar

* UTC +09:00 *
Osaka
Sapporo
Seoul
Tokyo
Yakutsk

* UTC +09:30 *
Adelaide
Darwin

* UTC +10:00 *
Brisbane
Canberra
Guam
Hobart
Melbourne
Port Moresby
Sydney
Vladivostok

* UTC +11:00 *
Magadan
New Caledonia
Solomon Is.
Srednekolymsk

* UTC +12:00 *
Auckland
Fiji
Kamchatka
Marshall Is.
Wellington

* UTC +12:45 *
Chatham Is.

* UTC +13:00 *
Nuku'alofa
Samoa
Tokelau Is.