ActiveSupport 5.2.3 timezones list

"International Date Line West"=>"Etc/GMT+12",
"Midway Island"=>"Pacific/Midway",
"American Samoa"=>"Pacific/Pago_Pago",
"Hawaii"=>"Pacific/Honolulu",
"Alaska"=>"America/Juneau",
"Pacific Time (US & Canada)"=>"America/Los_Angeles",
"Tijuana"=>"America/Tijuana",
"Mountain Time (US & Canada)"=>"America/Denver",
"Arizona"=>"America/Phoenix",
"Chihuahua"=>"America/Chihuahua",
"Mazatlan"=>"America/Mazatlan",
"Central Time (US & Canada)"=>"America/Chicago",
"Saskatchewan"=>"America/Regina",
"Guadalajara"=>"America/Mexico_City",
"Mexico City"=>"America/Mexico_City",
"Monterrey"=>"America/Monterrey",
"Central America"=>"America/Guatemala",
"Eastern Time (US & Canada)"=>"America/New_York",
"Indiana (East)"=>"America/Indiana/Indianapolis",
"Bogota"=>"America/Bogota",
"Lima"=>"America/Lima",
"Quito"=>"America/Lima",
"Atlantic Time (Canada)"=>"America/Halifax",
"Caracas"=>"America/Caracas",
"La Paz"=>"America/La_Paz",
"Santiago"=>"America/Santiago",
"Newfoundland"=>"America/St_Johns",
"Brasilia"=>"America/Sao_Paulo",
"Buenos Aires"=>"America/Argentina/Buenos_Aires",
"Montevideo"=>"America/Montevideo",
"Georgetown"=>"America/Guyana",
"Puerto Rico"=>"America/Puerto_Rico",
"Greenland"=>"America/Godthab",
"Mid-Atlantic"=>"Atlantic/South_Georgia",
"Azores"=>"Atlantic/Azores",
"Cape Verde Is."=>"Atlantic/Cape_Verde",
"Dublin"=>"Europe/Dublin",
"Edinburgh"=>"Europe/London",
"Lisbon"=>"Europe/Lisbon",
"London"=>"Europe/London",
"Casablanca"=>"Africa/Casablanca",
"Monrovia"=>"Africa/Monrovia",
"UTC"=>"Etc/UTC",
"Belgrade"=>"Europe/Belgrade",
"Bratislava"=>"Europe/Bratislava",
"Budapest"=>"Europe/Budapest",
"Ljubljana"=>"Europe/Ljubljana",
"Prague"=>"Europe/Prague",
"Sarajevo"=>"Europe/Sarajevo",
"Skopje"=>"Europe/Skopje",
"Warsaw"=>"Europe/Warsaw",
"Zagreb"=>"Europe/Zagreb",
"Brussels"=>"Europe/Brussels",
"Copenhagen"=>"Europe/Copenhagen",
"Madrid"=>"Europe/Madrid",
"Paris"=>"Europe/Paris",
"Amsterdam"=>"Europe/Amsterdam",
"Berlin"=>"Europe/Berlin",
"Bern"=>"Europe/Zurich",
"Zurich"=>"Europe/Zurich",
"Rome"=>"Europe/Rome",
"Stockholm"=>"Europe/Stockholm",
"Vienna"=>"Europe/Vienna",
"West Central Africa"=>"Africa/Algiers",
"Bucharest"=>"Europe/Bucharest",
"Cairo"=>"Africa/Cairo",
"Helsinki"=>"Europe/Helsinki",
"Kyiv"=>"Europe/Kiev",
"Riga"=>"Europe/Riga",
"Sofia"=>"Europe/Sofia",
"Tallinn"=>"Europe/Tallinn",
"Vilnius"=>"Europe/Vilnius",
"Athens"=>"Europe/Athens",
"Istanbul"=>"Europe/Istanbul",
"Minsk"=>"Europe/Minsk",
"Jerusalem"=>"Asia/Jerusalem",
"Harare"=>"Africa/Harare",
"Pretoria"=>"Africa/Johannesburg",
"Kaliningrad"=>"Europe/Kaliningrad",
"Moscow"=>"Europe/Moscow",
"St. Petersburg"=>"Europe/Moscow",
"Volgograd"=>"Europe/Volgograd",
"Samara"=>"Europe/Samara",
"Kuwait"=>"Asia/Kuwait",
"Riyadh"=>"Asia/Riyadh",
"Nairobi"=>"Africa/Nairobi",
"Baghdad"=>"Asia/Baghdad",
"Tehran"=>"Asia/Tehran",
"Abu Dhabi"=>"Asia/Muscat",
"Muscat"=>"Asia/Muscat",
"Baku"=>"Asia/Baku",
"Tbilisi"=>"Asia/Tbilisi",
"Yerevan"=>"Asia/Yerevan",
"Kabul"=>"Asia/Kabul",
"Ekaterinburg"=>"Asia/Yekaterinburg",
"Islamabad"=>"Asia/Karachi",
"Karachi"=>"Asia/Karachi",
"Tashkent"=>"Asia/Tashkent",
"Chennai"=>"Asia/Kolkata",
"Kolkata"=>"Asia/Kolkata",
"Mumbai"=>"Asia/Kolkata",
"New Delhi"=>"Asia/Kolkata",
"Kathmandu"=>"Asia/Kathmandu",
"Astana"=>"Asia/Dhaka",
"Dhaka"=>"Asia/Dhaka",
"Sri Jayawardenepura"=>"Asia/Colombo",
"Almaty"=>"Asia/Almaty",
"Novosibirsk"=>"Asia/Novosibirsk",
"Rangoon"=>"Asia/Rangoon",
"Bangkok"=>"Asia/Bangkok",
"Hanoi"=>"Asia/Bangkok",
"Jakarta"=>"Asia/Jakarta",
"Krasnoyarsk"=>"Asia/Krasnoyarsk",
"Beijing"=>"Asia/Shanghai",
"Chongqing"=>"Asia/Chongqing",
"Hong Kong"=>"Asia/Hong_Kong",
"Urumqi"=>"Asia/Urumqi",
"Kuala Lumpur"=>"Asia/Kuala_Lumpur",
"Singapore"=>"Asia/Singapore",
"Taipei"=>"Asia/Taipei",
"Perth"=>"Australia/Perth",
"Irkutsk"=>"Asia/Irkutsk",
"Ulaanbaatar"=>"Asia/Ulaanbaatar",
"Seoul"=>"Asia/Seoul",
"Osaka"=>"Asia/Tokyo",
"Sapporo"=>"Asia/Tokyo",
"Tokyo"=>"Asia/Tokyo",
"Yakutsk"=>"Asia/Yakutsk",
"Darwin"=>"Australia/Darwin",
"Adelaide"=>"Australia/Adelaide",
"Canberra"=>"Australia/Melbourne",
"Melbourne"=>"Australia/Melbourne",
"Sydney"=>"Australia/Sydney",
"Brisbane"=>"Australia/Brisbane",
"Hobart"=>"Australia/Hobart",
"Vladivostok"=>"Asia/Vladivostok",
"Guam"=>"Pacific/Guam",
"Port Moresby"=>"Pacific/Port_Moresby",
"Magadan"=>"Asia/Magadan",
"Srednekolymsk"=>"Asia/Srednekolymsk",
"Solomon Is."=>"Pacific/Guadalcanal",
"New Caledonia"=>"Pacific/Noumea",
"Fiji"=>"Pacific/Fiji",
"Kamchatka"=>"Asia/Kamchatka",
"Marshall Is."=>"Pacific/Majuro",
"Auckland"=>"Pacific/Auckland",
"Wellington"=>"Pacific/Auckland",
"Nuku'alofa"=>"Pacific/Tongatapu",
"Tokelau Is."=>"Pacific/Fakaofo",
"Chatham Is."=>"Pacific/Chatham",
"Samoa"=>"Pacific/Apia"