How to get list of all timezones in javascript - Stack Overflow

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I am developing an application with react/redux, and I started using library react-intl for formatting messages and dates.

I have already been able to show in a <FormattedDate> tag what timezone it's using.

I would like to have in a select all the possible timezones existing, so when the user picks one timezone, the <FormattedDate> changes to that format automatically.

I don't find how to list all posible timezones with react-intl.

I have also searched in google, and I did not find any built-in javascript function that does that.

Is it that way? How can I obtain that list?

Note: Don't think its the same question, since I don't want to use external libraries, if possible, if its the only solution then I will have to handle that way... :/

I am developing an application with react/redux, and I started using library react-intl for formatting messages and dates.

I have already been able to show in a <FormattedDate> tag what timezone it's using.

I would like to have in a select all the possible timezones existing, so when the user picks one timezone, the <FormattedDate> changes to that format automatically.

I don't find how to list all posible timezones with react-intl.

I have also searched in google, and I did not find any built-in javascript function that does that.

Is it that way? How can I obtain that list?

Note: Don't think its the same question, since I don't want to use external libraries, if possible, if its the only solution then I will have to handle that way... :/

• javascript
• timezone
• react-intl

Share Improve this question Follow edited Oct 23, 2019 at 13:47 Nathan Arthur 9,06677 gold badges6464 silver badges8383 bronze badges asked Jul 15, 2016 at 15:06 MaydayMayday 5,11655 gold badges2525 silver badges6464 bronze badges 4

• Possible duplicate of How do I get timezones list using moment.js library? – Frank Tan Commented Jul 15, 2016 at 16:51
• 1 I found that library on google also, but I would like to do it with no more libraries, Just can believe its not implemented in javascript :/ – Mayday Commented Jul 15, 2016 at 20:24
• Believe it. Time zones in JavaScript have a long history of being insufficiently supported, and while there are some recent improvements, we still have a long way to go. – Matt Johnson-Pint Commented Jul 15, 2016 at 22:29
• 1 There is no fixed "list of all possible timezone names". Timezones, just like locales, are an evolving standard. Any "fixed" list in a library or browser will become outdated and different libraries implement different "snapshots". The common reference is the Unicode CLDR database cldr.unicode.org github.com/unicode-org/cldr/commits/master/common/bcp47/…; So taking a conservative subset supported on all platforms/libraries which consume your string may be a more robust option (esp. if your control is the sole source of input). – user6649841 Commented Apr 21, 2021 at 21:27

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13 Answers 13

Sorted by: Reset to default 263

I recently created an array containing all timezones and found that a couple of official timezones were missing from Chromium 71.0.3578.98.

You can see that array in this comment of the bug I reported. For convenience, I've included the array below:

var aryIanaTimeZones = [
  'Europe/Andorra',
  'Asia/Dubai',
  'Asia/Kabul',
  'Europe/Tirane',
  'Asia/Yerevan',
  'Antarctica/Casey',
  'Antarctica/Davis',
  'Antarctica/DumontDUrville', // https://bugs.chromium.org/p/chromium/issues/detail?id=928068
  'Antarctica/Mawson',
  'Antarctica/Palmer',
  'Antarctica/Rothera',
  'Antarctica/Syowa',
  'Antarctica/Troll',
  'Antarctica/Vostok',
  'America/Argentina/Buenos_Aires',
  'America/Argentina/Cordoba',
  'America/Argentina/Salta',
  'America/Argentina/Jujuy',
  'America/Argentina/Tucuman',
  'America/Argentina/Catamarca',
  'America/Argentina/La_Rioja',
  'America/Argentina/San_Juan',
  'America/Argentina/Mendoza',
  'America/Argentina/San_Luis',
  'America/Argentina/Rio_Gallegos',
  'America/Argentina/Ushuaia',
  'Pacific/Pago_Pago',
  'Europe/Vienna',
  'Australia/Lord_Howe',
  'Antarctica/Macquarie',
  'Australia/Hobart',
  'Australia/Currie',
  'Australia/Melbourne',
  'Australia/Sydney',
  'Australia/Broken_Hill',
  'Australia/Brisbane',
  'Australia/Lindeman',
  'Australia/Adelaide',
  'Australia/Darwin',
  'Australia/Perth',
  'Australia/Eucla',
  'Asia/Baku',
  'America/Barbados',
  'Asia/Dhaka',
  'Europe/Brussels',
  'Europe/Sofia',
  'Atlantic/Bermuda',
  'Asia/Brunei',
  'America/La_Paz',
  'America/Noronha',
  'America/Belem',
  'America/Fortaleza',
  'America/Recife',
  'America/Araguaina',
  'America/Maceio',
  'America/Bahia',
  'America/Sao_Paulo',
  'America/Campo_Grande',
  'America/Cuiaba',
  'America/Santarem',
  'America/Porto_Velho',
  'America/Boa_Vista',
  'America/Manaus',
  'America/Eirunepe',
  'America/Rio_Branco',
  'America/Nassau',
  'Asia/Thimphu',
  'Europe/Minsk',
  'America/Belize',
  'America/St_Johns',
  'America/Halifax',
  'America/Glace_Bay',
  'America/Moncton',
  'America/Goose_Bay',
  'America/Blanc-Sablon',
  'America/Toronto',
  'America/Nipigon',
  'America/Thunder_Bay',
  'America/Iqaluit',
  'America/Pangnirtung',
  'America/Atikokan',
  'America/Winnipeg',
  'America/Rainy_River',
  'America/Resolute',
  'America/Rankin_Inlet',
  'America/Regina',
  'America/Swift_Current',
  'America/Edmonton',
  'America/Cambridge_Bay',
  'America/Yellowknife',
  'America/Inuvik',
  'America/Creston',
  'America/Dawson_Creek',
  'America/Fort_Nelson',
  'America/Vancouver',
  'America/Whitehorse',
  'America/Dawson',
  'Indian/Cocos',
  'Europe/Zurich',
  'Africa/Abidjan',
  'Pacific/Rarotonga',
  'America/Santiago',
  'America/Punta_Arenas',
  'Pacific/Easter',
  'Asia/Shanghai',
  'Asia/Urumqi',
  'America/Bogota',
  'America/Costa_Rica',
  'America/Havana',
  'Atlantic/Cape_Verde',
  'America/Curacao',
  'Indian/Christmas',
  'Asia/Nicosia',
  'Asia/Famagusta',
  'Europe/Prague',
  'Europe/Berlin',
  'Europe/Copenhagen',
  'America/Santo_Domingo',
  'Africa/Algiers',
  'America/Guayaquil',
  'Pacific/Galapagos',
  'Europe/Tallinn',
  'Africa/Cairo',
  'Africa/El_Aaiun',
  'Europe/Madrid',
  'Africa/Ceuta',
  'Atlantic/Canary',
  'Europe/Helsinki',
  'Pacific/Fiji',
  'Atlantic/Stanley',
  'Pacific/Chuuk',
  'Pacific/Pohnpei',
  'Pacific/Kosrae',
  'Atlantic/Faroe',
  'Europe/Paris',
  'Europe/London',
  'Asia/Tbilisi',
  'America/Cayenne',
  'Africa/Accra',
  'Europe/Gibraltar',
  'America/Godthab',
  'America/Danmarkshavn',
  'America/Scoresbysund',
  'America/Thule',
  'Europe/Athens',
  'Atlantic/South_Georgia',
  'America/Guatemala',
  'Pacific/Guam',
  'Africa/Bissau',
  'America/Guyana',
  'Asia/Hong_Kong',
  'America/Tegucigalpa',
  'America/Port-au-Prince',
  'Europe/Budapest',
  'Asia/Jakarta',
  'Asia/Pontianak',
  'Asia/Makassar',
  'Asia/Jayapura',
  'Europe/Dublin',
  'Asia/Jerusalem',
  'Asia/Kolkata',
  'Indian/Chagos',
  'Asia/Baghdad',
  'Asia/Tehran',
  'Atlantic/Reykjavik',
  'Europe/Rome',
  'America/Jamaica',
  'Asia/Amman',
  'Asia/Tokyo',
  'Africa/Nairobi',
  'Asia/Bishkek',
  'Pacific/Tarawa',
  'Pacific/Enderbury',
  'Pacific/Kiritimati',
  'Asia/Pyongyang',
  'Asia/Seoul',
  'Asia/Almaty',
  'Asia/Qyzylorda',
  'Asia/Qostanay', // https://bugs.chromium.org/p/chromium/issues/detail?id=928068
  'Asia/Aqtobe',
  'Asia/Aqtau',
  'Asia/Atyrau',
  'Asia/Oral',
  'Asia/Beirut',
  'Asia/Colombo',
  'Africa/Monrovia',
  'Europe/Vilnius',
  'Europe/Luxembourg',
  'Europe/Riga',
  'Africa/Tripoli',
  'Africa/Casablanca',
  'Europe/Monaco',
  'Europe/Chisinau',
  'Pacific/Majuro',
  'Pacific/Kwajalein',
  'Asia/Yangon',
  'Asia/Ulaanbaatar',
  'Asia/Hovd',
  'Asia/Choibalsan',
  'Asia/Macau',
  'America/Martinique',
  'Europe/Malta',
  'Indian/Mauritius',
  'Indian/Maldives',
  'America/Mexico_City',
  'America/Cancun',
  'America/Merida',
  'America/Monterrey',
  'America/Matamoros',
  'America/Mazatlan',
  'America/Chihuahua',
  'America/Ojinaga',
  'America/Hermosillo',
  'America/Tijuana',
  'America/Bahia_Banderas',
  'Asia/Kuala_Lumpur',
  'Asia/Kuching',
  'Africa/Maputo',
  'Africa/Windhoek',
  'Pacific/Noumea',
  'Pacific/Norfolk',
  'Africa/Lagos',
  'America/Managua',
  'Europe/Amsterdam',
  'Europe/Oslo',
  'Asia/Kathmandu',
  'Pacific/Nauru',
  'Pacific/Niue',
  'Pacific/Auckland',
  'Pacific/Chatham',
  'America/Panama',
  'America/Lima',
  'Pacific/Tahiti',
  'Pacific/Marquesas',
  'Pacific/Gambier',
  'Pacific/Port_Moresby',
  'Pacific/Bougainville',
  'Asia/Manila',
  'Asia/Karachi',
  'Europe/Warsaw',
  'America/Miquelon',
  'Pacific/Pitcairn',
  'America/Puerto_Rico',
  'Asia/Gaza',
  'Asia/Hebron',
  'Europe/Lisbon',
  'Atlantic/Madeira',
  'Atlantic/Azores',
  'Pacific/Palau',
  'America/Asuncion',
  'Asia/Qatar',
  'Indian/Reunion',
  'Europe/Bucharest',
  'Europe/Belgrade',
  'Europe/Kaliningrad',
  'Europe/Moscow',
  'Europe/Simferopol',
  'Europe/Kirov',
  'Europe/Astrakhan',
  'Europe/Volgograd',
  'Europe/Saratov',
  'Europe/Ulyanovsk',
  'Europe/Samara',
  'Asia/Yekaterinburg',
  'Asia/Omsk',
  'Asia/Novosibirsk',
  'Asia/Barnaul',
  'Asia/Tomsk',
  'Asia/Novokuznetsk',
  'Asia/Krasnoyarsk',
  'Asia/Irkutsk',
  'Asia/Chita',
  'Asia/Yakutsk',
  'Asia/Khandyga',
  'Asia/Vladivostok',
  'Asia/Ust-Nera',
  'Asia/Magadan',
  'Asia/Sakhalin',
  'Asia/Srednekolymsk',
  'Asia/Kamchatka',
  'Asia/Anadyr',
  'Asia/Riyadh',
  'Pacific/Guadalcanal',
  'Indian/Mahe',
  'Africa/Khartoum',
  'Europe/Stockholm',
  'Asia/Singapore',
  'America/Paramaribo',
  'Africa/Juba',
  'Africa/Sao_Tome',
  'America/El_Salvador',
  'Asia/Damascus',
  'America/Grand_Turk',
  'Africa/Ndjamena',
  'Indian/Kerguelen',
  'Asia/Bangkok',
  'Asia/Dushanbe',
  'Pacific/Fakaofo',
  'Asia/Dili',
  'Asia/Ashgabat',
  'Africa/Tunis',
  'Pacific/Tongatapu',
  'Europe/Istanbul',
  'America/Port_of_Spain',
  'Pacific/Funafuti',
  'Asia/Taipei',
  'Europe/Kiev',
  'Europe/Uzhgorod',
  'Europe/Zaporozhye',
  'Pacific/Wake',
  'America/New_York',
  'America/Detroit',
  'America/Kentucky/Louisville',
  'America/Kentucky/Monticello',
  'America/Indiana/Indianapolis',
  'America/Indiana/Vincennes',
  'America/Indiana/Winamac',
  'America/Indiana/Marengo',
  'America/Indiana/Petersburg',
  'America/Indiana/Vevay',
  'America/Chicago',
  'America/Indiana/Tell_City',
  'America/Indiana/Knox',
  'America/Menominee',
  'America/North_Dakota/Center',
  'America/North_Dakota/New_Salem',
  'America/North_Dakota/Beulah',
  'America/Denver',
  'America/Boise',
  'America/Phoenix',
  'America/Los_Angeles',
  'America/Anchorage',
  'America/Juneau',
  'America/Sitka',
  'America/Metlakatla',
  'America/Yakutat',
  'America/Nome',
  'America/Adak',
  'Pacific/Honolulu',
  'America/Montevideo',
  'Asia/Samarkand',
  'Asia/Tashkent',
  'America/Caracas',
  'Asia/Ho_Chi_Minh',
  'Pacific/Efate',
  'Pacific/Wallis',
  'Pacific/Apia',
  'Africa/Johannesburg'
];

let date = new Date;
aryIanaTimeZones.forEach((timeZone) =>
{
  let strTime = date.toLocaleString("en-US", {timeZone: `${timeZone}`});
  console.log(timeZone, strTime);
});

If you're like me, in wondering why there are so many timezones, check out this question.

UPDATE 2022-06-08:

If you only need a full list of time zones that your environment supports, you can now acquire that array using Intl.supportedValuesOf(), like this:

let ary = Intl.supportedValuesOf('timeZone');

Whether that list is complete or not, will depend on your environment.

In the snippet below, I replace that array (from the first snippet) with Intl.supportedValuesOf('timeZone'):

var aryIanaTimeZones = Intl.supportedValuesOf('timeZone');

let date = new Date;
aryIanaTimeZones.forEach((timeZone) =>
{
  let strTime = date.toLocaleString("en-US",{timeZone: `${timeZone}`});
  console.log(timeZone, strTime);
});

Here's a comparison of the custom array versus Intl.supportedValuesOf('timeZone'):

let ary1 = [
      'Europe/Andorra',
      'Asia/Dubai',
      'Asia/Kabul',
      'Europe/Tirane',
      'Asia/Yerevan',
      'Antarctica/Casey',
      'Antarctica/Davis',
      'Antarctica/DumontDUrville', // https://bugs.chromium.org/p/chromium/issues/detail?id=928068
      'Antarctica/Mawson',
      'Antarctica/Palmer',
      'Antarctica/Rothera',
      'Antarctica/Syowa',
      'Antarctica/Troll',
      'Antarctica/Vostok',
      'America/Argentina/Buenos_Aires',
      'America/Argentina/Cordoba',
      'America/Argentina/Salta',
      'America/Argentina/Jujuy',
      'America/Argentina/Tucuman',
      'America/Argentina/Catamarca',
      'America/Argentina/La_Rioja',
      'America/Argentina/San_Juan',
      'America/Argentina/Mendoza',
      'America/Argentina/San_Luis',
      'America/Argentina/Rio_Gallegos',
      'America/Argentina/Ushuaia',
      'Pacific/Pago_Pago',
      'Europe/Vienna',
      'Australia/Lord_Howe',
      'Antarctica/Macquarie',
      'Australia/Hobart',
      'Australia/Currie',
      'Australia/Melbourne',
      'Australia/Sydney',
      'Australia/Broken_Hill',
      'Australia/Brisbane',
      'Australia/Lindeman',
      'Australia/Adelaide',
      'Australia/Darwin',
      'Australia/Perth',
      'Australia/Eucla',
      'Asia/Baku',
      'America/Barbados',
      'Asia/Dhaka',
      'Europe/Brussels',
      'Europe/Sofia',
      'Atlantic/Bermuda',
      'Asia/Brunei',
      'America/La_Paz',
      'America/Noronha',
      'America/Belem',
      'America/Fortaleza',
      'America/Recife',
      'America/Araguaina',
      'America/Maceio',
      'America/Bahia',
      'America/Sao_Paulo',
      'America/Campo_Grande',
      'America/Cuiaba',
      'America/Santarem',
      'America/Porto_Velho',
      'America/Boa_Vista',
      'America/Manaus',
      'America/Eirunepe',
      'America/Rio_Branco',
      'America/Nassau',
      'Asia/Thimphu',
      'Europe/Minsk',
      'America/Belize',
      'America/St_Johns',
      'America/Halifax',
      'America/Glace_Bay',
      'America/Moncton',
      'America/Goose_Bay',
      'America/Blanc-Sablon',
      'America/Toronto',
      'America/Nipigon',
      'America/Thunder_Bay',
      'America/Iqaluit',
      'America/Pangnirtung',
      'America/Atikokan',
      'America/Winnipeg',
      'America/Rainy_River',
      'America/Resolute',
      'America/Rankin_Inlet',
      'America/Regina',
      'America/Swift_Current',
      'America/Edmonton',
      'America/Cambridge_Bay',
      'America/Yellowknife',
      'America/Inuvik',
      'America/Creston',
      'America/Dawson_Creek',
      'America/Fort_Nelson',
      'America/Vancouver',
      'America/Whitehorse',
      'America/Dawson',
      'Indian/Cocos',
      'Europe/Zurich',
      'Africa/Abidjan',
      'Pacific/Rarotonga',
      'America/Santiago',
      'America/Punta_Arenas',
      'Pacific/Easter',
      'Asia/Shanghai',
      'Asia/Urumqi',
      'America/Bogota',
      'America/Costa_Rica',
      'America/Havana',
      'Atlantic/Cape_Verde',
      'America/Curacao',
      'Indian/Christmas',
      'Asia/Nicosia',
      'Asia/Famagusta',
      'Europe/Prague',
      'Europe/Berlin',
      'Europe/Copenhagen',
      'America/Santo_Domingo',
      'Africa/Algiers',
      'America/Guayaquil',
      'Pacific/Galapagos',
      'Europe/Tallinn',
      'Africa/Cairo',
      'Africa/El_Aaiun',
      'Europe/Madrid',
      'Africa/Ceuta',
      'Atlantic/Canary',
      'Europe/Helsinki',
      'Pacific/Fiji',
      'Atlantic/Stanley',
      'Pacific/Chuuk',
      'Pacific/Pohnpei',
      'Pacific/Kosrae',
      'Atlantic/Faroe',
      'Europe/Paris',
      'Europe/London',
      'Asia/Tbilisi',
      'America/Cayenne',
      'Africa/Accra',
      'Europe/Gibraltar',
      'America/Godthab',
      'America/Danmarkshavn',
      'America/Scoresbysund',
      'America/Thule',
      'Europe/Athens',
      'Atlantic/South_Georgia',
      'America/Guatemala',
      'Pacific/Guam',
      'Africa/Bissau',
      'America/Guyana',
      'Asia/Hong_Kong',
      'America/Tegucigalpa',
      'America/Port-au-Prince',
      'Europe/Budapest',
      'Asia/Jakarta',
      'Asia/Pontianak',
      'Asia/Makassar',
      'Asia/Jayapura',
      'Europe/Dublin',
      'Asia/Jerusalem',
      'Asia/Kolkata',
      'Indian/Chagos',
      'Asia/Baghdad',
      'Asia/Tehran',
      'Atlantic/Reykjavik',
      'Europe/Rome',
      'America/Jamaica',
      'Asia/Amman',
      'Asia/Tokyo',
      'Africa/Nairobi',
      'Asia/Bishkek',
      'Pacific/Tarawa',
      'Pacific/Enderbury',
      'Pacific/Kiritimati',
      'Asia/Pyongyang',
      'Asia/Seoul',
      'Asia/Almaty',
      'Asia/Qyzylorda',
      'Asia/Qostanay', // https://bugs.chromium.org/p/chromium/issues/detail?id=928068
      'Asia/Aqtobe',
      'Asia/Aqtau',
      'Asia/Atyrau',
      'Asia/Oral',
      'Asia/Beirut',
      'Asia/Colombo',
      'Africa/Monrovia',
      'Europe/Vilnius',
      'Europe/Luxembourg',
      'Europe/Riga',
      'Africa/Tripoli',
      'Africa/Casablanca',
      'Europe/Monaco',
      'Europe/Chisinau',
      'Pacific/Majuro',
      'Pacific/Kwajalein',
      'Asia/Yangon',
      'Asia/Ulaanbaatar',
      'Asia/Hovd',
      'Asia/Choibalsan',
      'Asia/Macau',
      'America/Martinique',
      'Europe/Malta',
      'Indian/Mauritius',
      'Indian/Maldives',
      'America/Mexico_City',
      'America/Cancun',
      'America/Merida',
      'America/Monterrey',
      'America/Matamoros',
      'America/Mazatlan',
      'America/Chihuahua',
      'America/Ojinaga',
      'America/Hermosillo',
      'America/Tijuana',
      'America/Bahia_Banderas',
      'Asia/Kuala_Lumpur',
      'Asia/Kuching',
      'Africa/Maputo',
      'Africa/Windhoek',
      'Pacific/Noumea',
      'Pacific/Norfolk',
      'Africa/Lagos',
      'America/Managua',
      'Europe/Amsterdam',
      'Europe/Oslo',
      'Asia/Kathmandu',
      'Pacific/Nauru',
      'Pacific/Niue',
      'Pacific/Auckland',
      'Pacific/Chatham',
      'America/Panama',
      'America/Lima',
      'Pacific/Tahiti',
      'Pacific/Marquesas',
      'Pacific/Gambier',
      'Pacific/Port_Moresby',
      'Pacific/Bougainville',
      'Asia/Manila',
      'Asia/Karachi',
      'Europe/Warsaw',
      'America/Miquelon',
      'Pacific/Pitcairn',
      'America/Puerto_Rico',
      'Asia/Gaza',
      'Asia/Hebron',
      'Europe/Lisbon',
      'Atlantic/Madeira',
      'Atlantic/Azores',
      'Pacific/Palau',
      'America/Asuncion',
      'Asia/Qatar',
      'Indian/Reunion',
      'Europe/Bucharest',
      'Europe/Belgrade',
      'Europe/Kaliningrad',
      'Europe/Moscow',
      'Europe/Simferopol',
      'Europe/Kirov',
      'Europe/Astrakhan',
      'Europe/Volgograd',
      'Europe/Saratov',
      'Europe/Ulyanovsk',
      'Europe/Samara',
      'Asia/Yekaterinburg',
      'Asia/Omsk',
      'Asia/Novosibirsk',
      'Asia/Barnaul',
      'Asia/Tomsk',
      'Asia/Novokuznetsk',
      'Asia/Krasnoyarsk',
      'Asia/Irkutsk',
      'Asia/Chita',
      'Asia/Yakutsk',
      'Asia/Khandyga',
      'Asia/Vladivostok',
      'Asia/Ust-Nera',
      'Asia/Magadan',
      'Asia/Sakhalin',
      'Asia/Srednekolymsk',
      'Asia/Kamchatka',
      'Asia/Anadyr',
      'Asia/Riyadh',
      'Pacific/Guadalcanal',
      'Indian/Mahe',
      'Africa/Khartoum',
      'Europe/Stockholm',
      'Asia/Singapore',
      'America/Paramaribo',
      'Africa/Juba',
      'Africa/Sao_Tome',
      'America/El_Salvador',
      'Asia/Damascus',
      'America/Grand_Turk',
      'Africa/Ndjamena',
      'Indian/Kerguelen',
      'Asia/Bangkok',
      'Asia/Dushanbe',
      'Pacific/Fakaofo',
      'Asia/Dili',
      'Asia/Ashgabat',
      'Africa/Tunis',
      'Pacific/Tongatapu',
      'Europe/Istanbul',
      'America/Port_of_Spain',
      'Pacific/Funafuti',
      'Asia/Taipei',
      'Europe/Kiev',
      'Europe/Uzhgorod',
      'Europe/Zaporozhye',
      'Pacific/Wake',
      'America/New_York',
      'America/Detroit',
      'America/Kentucky/Louisville',
      'America/Kentucky/Monticello',
      'America/Indiana/Indianapolis',
      'America/Indiana/Vincennes',
      'America/Indiana/Winamac',
      'America/Indiana/Marengo',
      'America/Indiana/Petersburg',
      'America/Indiana/Vevay',
      'America/Chicago',
      'America/Indiana/Tell_City',
      'America/Indiana/Knox',
      'America/Menominee',
      'America/North_Dakota/Center',
      'America/North_Dakota/New_Salem',
      'America/North_Dakota/Beulah',
      'America/Denver',
      'America/Boise',
      'America/Phoenix',
      'America/Los_Angeles',
      'America/Anchorage',
      'America/Juneau',
      'America/Sitka',
      'America/Metlakatla',
      'America/Yakutat',
      'America/Nome',
      'America/Adak',
      'Pacific/Honolulu',
      'America/Montevideo',
      'Asia/Samarkand',
      'Asia/Tashkent',
      'America/Caracas',
      'Asia/Ho_Chi_Minh',
      'Pacific/Efate',
      'Pacific/Wallis',
      'Pacific/Apia',
      'Africa/Johannesburg'];

let ary2 = Intl.supportedValuesOf('timeZone');

let s1 = new Set(ary1);
let s2 = new Set(ary2);

let aryNotInSupportedValuesOf = ary1.filter((timeZone)=>
{
  if (!s2.has(timeZone))
  {
    return timeZone;
  }
});

let aryNotInCustomArray = ary2.filter((timeZone)=>
{
  if (!s1.has(timeZone))
  {
    return timeZone;
  }
});

if (aryNotInSupportedValuesOf.length > 0)
{
  console.log (`These values, that are included in the custom array, are not included in Intl.supportedValuesOf('timeZone'):` ,aryNotInSupportedValuesOf);
}
else
{
  console.log(`All values in the custom Array are included in Intl.supportedValuesOf('timeZone')`);
}

if (aryNotInCustomArray.length > 0)
{
  console.log (`These values, provided by Intl.supportedValuesOf('timeZone'), are not included in the custom array:`,aryNotInCustomArray);
}
else
{
  console.log(`All values in Intl.supportedValuesOf('timeZone') are inclued in the custom array.`);
}

Running the comparison above produces different results in each environment/browser I try. The latest Firefox reveals that numerous time zones have been added to the spec since I originally created that static list. However, other environments (I try) are still missing official time zones that were indeed included in that old list.

As of Jul 5th 2022, despite what's reflected on on caniuse or MDN, I see Intl.supportedValuesOf('timeZone') working in the latest:

• Chromium
• Firefox
• Node (v.18.4.0)

If Intl.supportedValuesOf('timeZone') isn't working in the snippets above, for a browser you're targeting, feel free to include a URL to that issue's bug-tracker in the comments below.

The API in Vanilla JavaScript for retrieving a list of all supported timezones:

Intl.supportedValuesOf('timeZone')

Browser/Platform Support:

• Chrome 99 (v8 9.9)
• Firefox 93
• Safari 15.4
• Edge 99
• Node.js 18.0.0 (v8 10.1)
• Official polyfill for other platforms which support the Intl API

To try it in Stack Overflow:

let select = document.querySelector('select');
if (!Intl.supportedValuesOf) {
  let opt = new Option('Your browser does not support Intl.supportedValuesOf().', null, true, true);
  opt.disabled = true;
  select.options.add(opt);
} else {
  for (const timeZone of Intl.supportedValuesOf('timeZone')) {
    select.options.add(new Option(timeZone));
  }
}

<select style="min-width: 20ch">

---

Side note: Above API only returnes IANA time zones (e.g. Continent/City_Name), not built in time zones, like "UTC" or "GMT". Check code snipped below for a list from Chrome/Firefox; other browsers/environments may have more built-in time zones.

const builtInTimeZones = [
  'CET',
  'CST6CDT',
  'Cuba',
  'EET',
  'EST',
  'EST5EDT',
  'Egypt',
  'Eire',
  'GB',
  'GB-Eire',
  'GMT',
  'GMT+0',
  'GMT-0',
  'GMT0',
  'Greenwich',
  'HST',
  'Hongkong',
  'Iceland',
  'Iran',
  'Israel',
  'Jamaica',
  'Japan',
  'Kwajalein',
  'Libya',
  'MET',
  'MST',
  'MST7MDT',
  'NZ',
  'NZ-CHAT',
  'Navajo',
  'PRC',
  'PST8PDT',
  'Poland',
  'Portugal',
  'ROC',
  'ROK',
  'Singapore',
  'Turkey',
  'UCT',
  'UTC',
  'Universal',
  'W-SU',
  'WET',
  'Zulu',
];
const supportedTimeZones = Intl.supportedValuesOf('timeZone');

const tbody = document.querySelector('tbody');
for (const timeZone of builtInTimeZones) {
  const formatted = new Date().toLocaleString(undefined, { timeZone });
  tbody.insertAdjacentHTML('beforeend', `
    <tr>
      <td>${timeZone}</td>
      <td>${formatted}</td>
      <td><code>${supportedTimeZones.includes(timeZone)}</code></td>
    </tr>
  `);
}

thead {
  position: sticky;
  top: 0px;
}
tr {
  background: #fcfcfc;
  color: #000;
}
tr:nth-child(2n + 1) {
  background: #f6f6f6;
}
td {
  padding: 0.25rem;
}

<table>
  <thead>
    <tr>
      <th>Time zone name</th>
      <th>Now in time zone</th>
      <th>Reported by <code>supportedValuesOf?</code></th>
    </tr>
  </thead>
  <tbody></tbody>
</table>

I too needed to have a complete time zone list with preformated data like:

{
  name: "America/Los_Angeles",
  alternativeName: "Pacific Time",
  group: ["America/Los_Angeles"],
  countryName: "United States",
  mainCities: ["Los Angeles", "San Diego"],
  rawOffsetInMinutes: -480, // "raw" time zone offset, when there's no DST in place
  rawFormat: "-08:00 Pacific Time - Los Angeles, San Diego",
  currentTimeOffsetInMinutes: -420, // "current" time zone offset, this is why getTimeZones() is a method and not just an object: it can only work at runtime
  currentTimeFormat: "-07:00 Pacific Time - Los Angeles, San Diego",
}

Since I could not find a good list that would also be maintained, I created an npm package for it: https://github.com/vvo/tzdb/. The list of time zones is automatically updated when there are changes (like new time zones).

You can then use https://github.com/moment/luxon if you need to manipulate dates with time zones.

The list of time zones is grouped to reduce the number of time zones. We do grouping only when: same country AND same offsets (DST, non DST).

This basically gives you a time zone list that is very close to the one from Google Calendar.

Good luck!

For the future searchers, it's possible to get a list of all timezones using moment-timezone.

import momentTZ from 'moment-timezone';

const defaultTimeZone = momentTZ.tz.guess();
const timeZonesList = momentTZ.tz.names();

I have updated the timezone list in the parent and child.

var rows = [
{
  id: 1,
  continent: 'Asia',
  newRow: [
    {id: 1, country: 'Dubai', tz: 'Asia/Dubai'},
    {id: 2, country: 'Kabul', tz: 'Asia/Kabul'},
    {id: 3, country: 'Yerevan', tz: 'Asia/Yerevan'},
    {id: 4, country: 'Baku', tz: 'Asia/Baku'},
    {id: 5, country: 'Dhaka', tz: 'Asia/Dhaka'},
    {id: 6, country: 'Brunei', tz: 'Asia/Brunei'},
    {id: 7, country: 'Thimphu', tz: 'Asia/Thimphu'},
    {id: 8, country: 'Shanghai', tz: 'Asia/Shanghai'},
    {id: 9, country: 'Urumqi', tz: 'Asia/Urumqi'},
    {id: 10, country: 'Nicosia', tz: 'Asia/Nicosia'},
    {id: 11, country: 'Famagusta', tz: 'Asia/Famagusta'},
    {id: 12, country: 'Tbilisi', tz: 'Asia/Tbilisi'},
    {id: 13, country: 'Hong_Kong', tz: 'Asia/Hong_Kong'},
    {id: 14, country: 'Jakarta', tz: 'Asia/Jakarta'},
    {id: 15, country: 'Pontianak', tz: 'Asia/Pontianak'},
    {id: 16, country: 'Makassar', tz: 'Asia/Makassar'},
    {id: 17, country: 'Jayapura', tz: 'Asia/Jayapura'},
    {id: 18, country: 'Jerusalem', tz: 'Asia/Jerusalem'},
    {id: 19, country: 'Kolkata', tz: 'Asia/Kolkata'},
    {id: 20, country: 'Baghdad', tz: 'Asia/Baghdad'},
    {id: 21, country: 'Tehran', tz: 'Asia/Tehran'},
    {id: 22, country: 'Amman', tz: 'Asia/Amman'},
    {id: 23, country: 'Tokyo', tz: 'Asia/Tokyo'},
    {id: 24, country: 'Bishkek', tz: 'Asia/Bishkek'},
    {id: 25, country: 'Pyongyang', tz: 'Asia/Pyongyang'},
    {id: 26, country: 'Seoul', tz: 'Asia/Seoul'},
    {id: 27, country: 'Almaty', tz: 'Asia/Almaty'},
    {id: 28, country: 'Qyzylorda', tz: 'Asia/Qyzylorda'},
    {id: 29, country: 'Qostanay', tz: 'Asia/Qostanay'},
    {id: 30, country: 'Aqtobe', tz: 'Asia/Aqtobe'},
    {id: 31, country: 'Aqtau', tz: 'Asia/Aqtau'},
    {id: 32, country: 'Atyrau', tz: 'Asia/Atyrau'},
    {id: 33, country: 'Oral', tz: 'Asia/Oral'},
    {id: 34, country: 'Beirut', tz: 'Asia/Beirut'},
    {id: 35, country: 'Colombo', tz: 'Asia/Colombo'},
    {id: 36, country: 'Yangon', tz: 'Asia/Yangon'},
    {id: 37, country: 'Ulaanbaatar', tz: 'Asia/Ulaanbaatar'},
    {id: 38, country: 'Hovd', tz: 'Asia/Hovd'},
    {id: 39, country: 'Choibalsan', tz: 'Asia/Choibalsan'},
    {id: 40, country: 'Macau', tz: 'Asia/Macau'},
    {id: 41, country: 'Kuala_Lumpur', tz: 'Asia/Kuala_Lumpur'},
    {id: 42, country: 'Kuching', tz: 'Asia/Kuching'},
    {id: 43, country: 'Karachi', tz: 'Asia/Karachi'},
    {id: 44, country: 'Gaza', tz: 'Asia/Gaza'},
    {id: 45, country: 'Hebron', tz: 'Asia/Hebron'},
    {id: 46, country: 'Kathmandu', tz: 'Asia/Kathmandu'},
    {id: 47, country: 'Yekaterinburg', tz: 'Asia/Yekaterinburg'},
    {id: 48, country: 'Qatar', tz: 'Asia/Qatar'},
    {id: 49, country: 'Omsk', tz: 'Asia/Omsk'},
    {id: 50, country: 'Novosibirsk', tz: 'Asia/Novosibirsk'},
    {id: 51, country: 'Barnaul', tz: 'Asia/Barnaul'},
    {id: 52, country: 'Tomsk', tz: 'Asia/Tomsk'},
    {id: 53, country: 'Novokuznetsk', tz: 'Asia/Novokuznetsk'},
    {id: 54, country: 'Krasnoyarsk', tz: 'Asia/Krasnoyarsk'},
    {id: 55, country: 'Irkutsk', tz: 'Asia/Irkutsk'},
    {id: 56, country: 'Chita', tz: 'Asia/Chita'},
    {id: 57, country: 'Yakutsk', tz: 'Asia/Yakutsk'},
    {id: 58, country: 'Khandyga', tz: 'Asia/Khandyga'},
    {id: 59, country: 'Vladivostok', tz: 'Asia/Vladivostok'},
    {id: 60, country: 'Ust-Nera', tz: 'Asia/Ust-Nera'},
    {id: 61, country: 'Singapore', tz: 'Asia/Singapore'},
    {id: 62, country: 'Magadan', tz: 'Asia/Magadan'},
    {id: 63, country: 'Sakhalin', tz: 'Asia/Sakhalin'},
    {id: 64, country: 'Srednekolymsk', tz: 'Asia/Srednekolymsk'},
    {id: 65, country: 'Kamchatka', tz: 'Asia/Kamchatka'},
    {id: 66, country: 'Anadyr', tz: 'Asia/Anadyr'},
    {id: 67, country: 'Bangkok', tz: 'Asia/Bangkok'},
    {id: 68, country: 'Dushanbe', tz: 'Asia/Dushanbe'},
    {id: 69, country: 'Taipei', tz: 'Asia/Taipei'},
    {id: 70, country: 'Dili', tz: 'Asia/Dili'},
    {id: 71, country: 'Ashgabat', tz: 'Asia/Ashgabat'},
    {id: 72, country: 'Damascus', tz: 'Asia/Damascus'},
    {id: 73, country: 'Riyadh', tz: 'Asia/Riyadh'},
    {id: 74, country: 'Samarkand', tz: 'Asia/Samarkand'},
    {id: 75, country: 'Tashkent', tz: 'Asia/Tashkent'},
    {id: 76, country: 'Ho_Chi_Minh', tz: 'Asia/Ho_Chi_Minh'},
  ],
},
{
  id: 2,
  continent: 'Europe',
  newRow: [
    {id: 1, country: 'Andorra', tz: 'Europe/Andorra'},
    {id: 2, country: 'Tirane', tz: 'Europe/Tirane'},
    {id: 3, country: 'Vienna', tz: 'Europe/Vienna'},
    {id: 4, country: 'Brussels', tz: 'Europe/Brussels'},
    {id: 5, country: 'Sofia', tz: 'Europe/Sofia'},
    {id: 6, country: 'Minsk', tz: 'Europe/Minsk'},
    {id: 7, country: 'Zurich', tz: 'Europe/Zurich'},
    {id: 8, country: 'Prague', tz: 'Europe/Prague'},
    {id: 9, country: 'Berlin', tz: 'Europe/Berlin'},
    {id: 10, country: 'Copenhagen', tz: 'Europe/Copenhagen'},
    {id: 11, country: 'Tallinn', tz: 'Europe/Tallinn'},
    {id: 12, country: 'Madrid', tz: 'Europe/Madrid'},
    {id: 13, country: 'Helsinki', tz: 'Europe/Helsinki'},
    {id: 14, country: 'Paris', tz: 'Europe/Paris'},
    {id: 15, country: 'London', tz: 'Europe/London'},
    {id: 16, country: 'Gibraltar', tz: 'Europe/Gibraltar'},
    {id: 17, country: 'Athens', tz: 'Europe/Athens'},
    {id: 18, country: 'Budapest', tz: 'Europe/Budapest'},
    {id: 19, country: 'Dublin', tz: 'Europe/Dublin'},
    {id: 20, country: 'Rome', tz: 'Europe/Rome'},
    {id: 21, country: 'Vilnius', tz: 'Europe/Vilnius'},
    {id: 22, country: 'Luxembourg', tz: 'Europe/Luxembourg'},
    {id: 23, country: 'Riga', tz: 'Europe/Riga'},
    {id: 24, country: 'Monaco', tz: 'Europe/Monaco'},
    {id: 25, country: 'Chisinau', tz: 'Europe/Chisinau'},
    {id: 26, country: 'Malta', tz: 'Europe/Malta'},
    {id: 27, country: 'Amsterdam', tz: 'Europe/Amsterdam'},
    {id: 28, country: 'Oslo', tz: 'Europe/Oslo'},
    {id: 29, country: 'Warsaw', tz: 'Europe/Warsaw'},
    {id: 30, country: 'Warsaw', tz: 'Europe/Warsaw'},
    {id: 31, country: 'Lisbon', tz: 'Europe/Lisbon'},
    {id: 32, country: 'Bucharest', tz: 'Europe/Bucharest'},
    {id: 33, country: 'Belgrade', tz: 'Europe/Belgrade'},
    {id: 34, country: 'Kaliningrad', tz: 'Europe/Kaliningrad'},
    {id: 35, country: 'Moscow', tz: 'Europe/Moscow'},
    {id: 36, country: 'Simferopol', tz: 'Europe/Simferopol'},
    {id: 37, country: 'Kirov', tz: 'Europe/Kirov'},
    {id: 38, country: 'Astrakhan', tz: 'Europe/Astrakhan'},
    {id: 39, country: 'Volgograd', tz: 'Europe/Volgograd'},
    {id: 40, country: 'Saratov', tz: 'Europe/Saratov'},
    {id: 41, country: 'Ulyanovsk', tz: 'Europe/Ulyanovsk'},
    {id: 42, country: 'Samara', tz: 'Europe/Samara'},
    {id: 43, country: 'Stockholm', tz: 'Europe/Stockholm'},
    {id: 44, country: 'Istanbul', tz: 'Europe/Istanbul'},
    {id: 45, country: 'Kiev', tz: 'Europe/Kiev'},
    {id: 46, country: 'Uzhgorod', tz: 'Europe/Uzhgorod'},
    {id: 47, country: 'Zaporozhye', tz: 'Europe/Zaporozhye'},
  ],
},
{
  id: 3,
  continent: 'Antarctica',
  newRow: [
    {id: 1, country: 'Casey', tz: 'Antarctica/Casey'},
    {id: 2, country: 'Davis', tz: 'Antarctica/Davis'},
    {id: 3, country: 'DumontDUrville', tz: 'Antarctica/DumontDUrville'},
    {id: 4, country: 'Mawson', tz: 'Antarctica/Mawson'},
    {id: 5, country: 'Palmer', tz: 'Antarctica/Palmer'},
    {id: 6, country: 'Rothera', tz: 'Antarctica/Rothera'},
    {id: 7, country: 'Syowa', tz: 'Antarctica/Syowa'},
    {id: 8, country: 'Troll', tz: 'Antarctica/Troll'},
    {id: 9, country: 'Vostok', tz: 'Antarctica/Vostok'},
    {id: 10, country: 'Macquarie', tz: 'Antarctica/Macquarie'},
  ],
},
{
  id: 4,
  continent: 'America',
  newRow: [
    {id: 1, country: 'Buenos_Aires', tz: 'America/Argentina/Buenos_Aires'},
    {id: 2, country: 'Cordoba', tz: 'America/Argentina/Cordoba'},
    {id: 3, country: 'Salta', tz: 'America/Argentina/Salta'},
    {id: 4, country: 'Jujuy', tz: 'America/Argentina/Jujuy'},
    {id: 5, country: 'Tucuman', tz: 'America/Argentina/Tucuman'},
    {id: 6, country: 'Catamarca', tz: 'America/Argentina/Catamarca'},
    {id: 7, country: 'La_Rioja', tz: 'America/Argentina/La_Rioja'},
    {id: 8, country: 'San_Juan', tz: 'America/Argentina/San_Juan'},
    {id: 9, country: 'Mendoza', tz: 'America/Argentina/Mendoza'},
    {id: 10, country: 'San_Luis', tz: 'America/Argentina/San_Luis'},
    {id: 11, country: 'Rio_Gallegos', tz: 'America/Argentina/Rio_Gallegos'},
    {id: 12, country: 'Ushuaia', tz: 'America/Argentina/Ushuaia'},
    {id: 13, country: 'Barbados', tz: 'America/Barbados'},
    {id: 14, country: 'La_Paz', tz: 'America/La_Paz'},
    {id: 15, country: 'Belem', tz: 'America/Belem'},
    {id: 16, country: 'Fortaleza', tz: 'America/Fortaleza'},
    {id: 17, country: 'Recife', tz: 'America/Recife'},
    {id: 18, country: 'Araguaina', tz: 'America/Araguaina'},
    {id: 19, country: 'Maceio', tz: 'America/Maceio'},
    {id: 20, country: 'Bahia', tz: 'America/Bahia'},
    {id: 21, country: 'Sao_Paulo', tz: 'America/Sao_Paulo'},
    {id: 22, country: 'Campo_Grande', tz: 'America/Campo_Grande'},
    {id: 23, country: 'Cuiaba', tz: 'America/Cuiaba'},
    {id: 24, country: 'Porto_Velho', tz: 'America/Porto_Velho'},
    {id: 25, country: 'Boa_Vista', tz: 'America/Boa_Vista'},
    {id: 26, country: 'Manaus', tz: 'America/Manaus'},
    {id: 27, country: 'Eirunepe', tz: 'America/Eirunepe'},
    {id: 28, country: 'Rio_Branco', tz: 'America/Rio_Branco'},
    {id: 29, country: 'Nassau', tz: 'America/Nassau'},
    {id: 30, country: 'Belize', tz: 'America/Belize'},
    {id: 31, country: 'St_Johns', tz: 'America/St_Johns'},
    {id: 32, country: 'Halifax', tz: 'America/Halifax'},
    {id: 33, country: 'Glace_Bay', tz: 'America/Glace_Bay'},
    {id: 34, country: 'Moncton', tz: 'America/Moncton'},
    {id: 35, country: 'Goose_Bay', tz: 'America/Goose_Bay'},
    {id: 36, country: 'Blanc-Sablon', tz: 'America/Blanc-Sablon'},
    {id: 37, country: 'Toronto', tz: 'America/Toronto'},
    {id: 38, country: 'Nipigon', tz: 'America/Nipigon'},
    {id: 39, country: 'Thunder_Bay', tz: 'America/Thunder_Bay'},
    {id: 40, country: 'Iqaluit', tz: 'America/Iqaluit'},
    {id: 41, country: 'Pangnirtung', tz: 'America/Pangnirtung'},
    {id: 42, country: 'Atikokan', tz: 'America/Atikokan'},
    {id: 43, country: 'Winnipeg', tz: 'America/Winnipeg'},
    {id: 44, country: 'Rainy_River', tz: 'America/Rainy_River'},
    {id: 45, country: 'Resolute', tz: 'America/Resolute'},
    {id: 46, country: 'Rankin_Inlet', tz: 'America/Rankin_Inlet'},
    {id: 47, country: 'Regina', tz: 'America/Regina'},
    {id: 48, country: 'Swift_Current', tz: 'America/Swift_Current'},
    {id: 49, country: 'Edmonton', tz: 'America/Edmonton'},
    {id: 50, country: 'Cambridge_Bay', tz: 'America/Cambridge_Bay'},
    {id: 51, country: 'Yellowknife', tz: 'America/Yellowknife'},
    {id: 52, country: 'Inuvik', tz: 'America/Inuvik'},
    {id: 53, country: 'Creston', tz: 'America/Creston'},
    {id: 54, country: 'Dawson_Creek', tz: 'America/Dawson_Creek'},
    {id: 55, country: 'Fort_Nelson', tz: 'America/Fort_Nelson'},
    {id: 56, country: 'Vancouver', tz: 'America/Vancouver'},
    {id: 57, country: 'Whitehorse', tz: 'America/Whitehorse'},
    {id: 58, country: 'Dawson', tz: 'America/Dawson'},
    {id: 59, country: 'Santiago', tz: 'America/Santiago'},
    {id: 60, country: 'Punta_Arenas', tz: 'America/Punta_Arenas'},
    {id: 61, country: 'Bogota', tz: 'America/Bogota'},
    {id: 62, country: 'Costa_Rica', tz: 'America/Costa_Rica'},
    {id: 63, country: 'Havana', tz: 'America/Havana'},
    {id: 64, country: 'Curacao', tz: 'America/Curacao'},
    {id: 65, country: 'Santo_Domingo', tz: 'America/Santo_Domingo'},
    {id: 66, country: 'Guayaquil', tz: 'America/Guayaquil'},
    {id: 67, country: 'Cayenne', tz: 'America/Cayenne'},
    {id: 68, country: 'Godthab', tz: 'America/Godthab'},
    {id: 69, country: 'Danmarkshavn', tz: 'America/Danmarkshavn'},
    {id: 70, country: 'Scoresbysund', tz: 'America/Scoresbysund'},
    {id: 71, country: 'Cayenne', tz: 'America/Cayenne'},
    {id: 72, country: 'Godthab', tz: 'America/Godthab'},
    {id: 73, country: 'Danmarkshavn', tz: 'America/Danmarkshavn'},
    {id: 74, country: 'Scoresbysund', tz: 'America/Scoresbysund'},
    {id: 75, country: 'Thule', tz: 'America/Thule'},
    {id: 76, country: 'Guatemala', tz: 'America/Guatemala'},
    {id: 77, country: 'Guyana', tz: 'America/Guyana'},
    {id: 78, country: 'Tegucigalpa', tz: 'America/Tegucigalpa'},
    {id: 79, country: 'Port-au-Prince', tz: 'America/Port-au-Prince'},
    {id: 80, country: 'Jamaica', tz: 'America/Jamaica'},
    {id: 81, country: 'Martinique', tz: 'America/Martinique'},
    {id: 82, country: 'Mexico_City', tz: 'America/Mexico_City'},
    {id: 83, country: 'Cancun', tz: 'America/Cancun'},
    {id: 84, country: 'Merida', tz: 'America/Merida'},
    {id: 85, country: 'Monterrey', tz: 'America/Monterrey'},
    {id: 86, country: 'Matamoros', tz: 'America/Matamoros'},
    {id: 87, country: 'Caracas', tz: 'America/Caracas'},
    {id: 88, country: 'Mazatlan', tz: 'America/Mazatlan'},
    {id: 89, country: 'Chihuahua', tz: 'America/Chihuahua'},
    {id: 90, country: 'Ojinaga', tz: 'America/Ojinaga'},
    {id: 91, country: 'Hermosillo', tz: 'America/Hermosillo'},
    {id: 92, country: 'Tijuana', tz: 'America/Tijuana'},
    {id: 93, country: 'Bahia_Banderas', tz: 'America/Bahia_Banderas'},
    {id: 94, country: 'Managua', tz: 'America/Managua'},
    {id: 95, country: 'Panama', tz: 'America/Panama'},
    {id: 96, country: 'Lima', tz: 'America/Lima'},
    {id: 97, country: 'Miquelon', tz: 'America/Miquelon'},
    {id: 98, country: 'Puerto_Rico', tz: 'America/Puerto_Rico'},
    {id: 99, country: 'El_Salvador', tz: 'America/El_Salvador'},
    {id: 100, country: 'Grand_Turk', tz: 'America/Grand_Turk'},
    {id: 101, country: 'Paramaribo', tz: 'America/Paramaribo'},
    {id: 102, country: 'Asuncion', tz: 'America/Asuncion'},
    {id: 103, country: 'Port_of_Spain', tz: 'America/Port_of_Spain'},
    {id: 104, country: 'New_York', tz: 'America/New_York'},
    {id: 105, country: 'Detroit', tz: 'America/Detroit'},
    {id: 106, country: 'Louisville', tz: 'America/Kentucky/Louisville'},
    {id: 107, country: 'Monticello', tz: 'America/Kentucky/Monticello'},
    {id: 108, country: 'Indianapolis', tz: 'America/Indiana/Indianapolis'},
    {id: 109, country: 'Vincennes', tz: 'America/Indiana/Vincennes'},
    {id: 110, country: 'Winamac', tz: 'America/Indiana/Winamac'},
    {id: 111, country: 'Marengo', tz: 'America/Indiana/Marengo'},
    {id: 112, country: 'Petersburg', tz: 'America/Indiana/Petersburg'},
    {id: 113, country: 'Vevay', tz: 'America/Indiana/Vevay'},
    {id: 114, country: 'Tell_City', tz: 'America/Indiana/Tell_City'},
    {id: 115, country: 'Knox', tz: 'America/Indiana/Knox'},
    {id: 116, country: 'Chicago', tz: 'America/Chicago'},
    {id: 117, country: 'Menominee', tz: 'America/Menominee'},
    {id: 118, country: 'Denver', tz: 'America/Denver'},
    {id: 119, country: 'Boise', tz: 'America/Boise'},
    {id: 120, country: 'Phoenix', tz: 'America/Phoenix'},
    {id: 121, country: 'Center', tz: 'America/North_Dakota/Center'},
    {id: 122, country: 'New_Salem', tz: 'America/North_Dakota/New_Salem'},
    {id: 123, country: 'Beulah', tz: 'America/North_Dakota/Beulah'},
    {id: 124, country: 'Los_Angeles', tz: 'America/Los_Angeles'},
    {id: 125, country: 'Anchorage', tz: 'America/Anchorage'},
    {id: 126, country: 'Juneau', tz: 'America/Juneau'},
    {id: 127, country: 'Sitka', tz: 'America/Sitka'},
    {id: 128, country: 'Metlakatla', tz: 'America/Metlakatla'},
    {id: 129, country: 'Yakutat', tz: 'America/Yakutat'},
    {id: 130, country: 'Nome', tz: 'America/Nome'},
    {id: 131, country: 'Adak', tz: 'America/Adak'},
    {id: 132, country: 'Montevideo', tz: 'America/Montevideo'},
  ],
},
{
  id: 5,
  continent: 'Pacific',
  newRow: [
    {id: 1, country: 'Pago_Pago', tz: 'Pacific/Pago_Pago'},
    {id: 2, country: 'Rarotonga', tz: 'Pacific/Rarotonga'},
    {id: 3, country: 'Easter', tz: 'Pacific/Easter'},
    {id: 4, country: 'Galapagos', tz: 'Pacific/Galapagos'},
    {id: 5, country: 'Fiji', tz: 'Pacific/Fiji'},
    {id: 6, country: 'Chuuk', tz: 'Pacific/Chuuk'},
    {id: 7, country: 'Pohnpei', tz: 'Pacific/Pohnpei'},
    {id: 8, country: 'Kosrae', tz: 'Pacific/Kosrae'},
    {id: 9, country: 'Guam', tz: 'Pacific/Guam'},
    {id: 10, country: 'Majuro', tz: 'Pacific/Majuro'},
    {id: 11, country: 'Kwajalein', tz: 'Pacific/Kwajalein'},
    {id: 12, country: 'Tarawa', tz: 'Pacific/Tarawa'},
    {id: 13, country: 'Enderbury', tz: 'Pacific/Enderbury'},
    {id: 14, country: 'Kiritimati', tz: 'Pacific/Kiritimati'},
    {id: 15, country: 'Noumea', tz: 'Pacific/Noumea'},
    {id: 16, country: 'Norfolk', tz: 'Pacific/Norfolk'},
    {id: 17, country: 'Nauru', tz: 'Pacific/Nauru'},
    {id: 18, country: 'Niue', tz: 'Pacific/Niue'},
    {id: 19, country: 'Auckland', tz: 'Pacific/Auckland'},
    {id: 20, country: 'Chatham', tz: 'Pacific/Chatham'},
    {id: 21, country: 'Tahiti', tz: 'Pacific/Tahiti'},
    {id: 22, country: 'Marquesas', tz: 'Pacific/Marquesas'},
    {id: 23, country: 'Gambier', tz: 'Pacific/Gambier'},
    {id: 24, country: 'Port_Moresby', tz: 'Pacific/Port_Moresby'},
    {id: 25, country: 'Bougainville', tz: 'Pacific/Bougainville'},
    {id: 26, country: 'Pitcairn', tz: 'Pacific/Pitcairn'},
    {id: 27, country: 'Palau', tz: 'Pacific/Palau'},
    {id: 28, country: 'Guadalcanal', tz: 'Pacific/Guadalcanal'},
    {id: 29, country: 'Fakaofo', tz: 'Pacific/Fakaofo'},
    {id: 30, country: 'Tongatapu', tz: 'Pacific/Tongatapu'},
    {id: 31, country: 'Funafuti', tz: 'Pacific/Funafuti'},
    {id: 32, country: 'Wake', tz: 'Pacific/Wake'},
    {id: 33, country: 'Honolulu', tz: 'Pacific/Honolulu'},
    {id: 34, country: 'Efate', tz: 'Pacific/Efate'},
    {id: 35, country: 'Wallis', tz: 'Pacific/Wallis'},
    {id: 36, country: 'Apia', tz: 'Pacific/Apia'},
  ],
},
{
  id: 6,
  continent: 'Australia',
  newRow: [
    {id: 1, country: 'Lord_Howe', tz: 'Australia/Lord_Howe'},
    {id: 2, country: 'Hobart', tz: 'Australia/Hobart'},
    {id: 3, country: 'Currie', tz: 'Australia/Currie'},
    {id: 4, country: 'Melbourne', tz: 'Australia/Melbourne'},
    {id: 5, country: 'Sydney', tz: 'Australia/Sydney'},
    {id: 6, country: 'Broken_Hill', tz: 'Australia/Broken_Hill'},
    {id: 7, country: 'Brisbane', tz: 'Australia/Brisbane'},
    {id: 8, country: 'Lindeman', tz: 'Australia/Lindeman'},
    {id: 9, country: 'Adelaide', tz: 'Australia/Adelaide'},
    {id: 10, country: 'Darwin', tz: 'Australia/Darwin'},
    {id: 11, country: 'Perth', tz: 'Australia/Perth'},
    {id: 12, country: 'Eucla', tz: 'Australia/Eucla'},
  ],
},
{
  id: 7,
  continent: 'Africa',
  newRow: [
    {id: 1, country: 'Abidjan', tz: 'Africa/Abidjan'},
    {id: 2, country: 'Algiers', tz: 'Africa/Algiers'},
    {id: 3, country: 'Cairo', tz: 'Africa/Cairo'},
    {id: 4, country: 'El_Aaiun', tz: 'Africa/El_Aaiun'},
    {id: 5, country: 'Ceuta', tz: 'Africa/Ceuta'},
    {id: 6, country: 'Accra', tz: 'Africa/Accra'},
    {id: 7, country: 'Bissau', tz: 'Africa/Bissau'},
    {id: 8, country: 'Nairobi', tz: 'Africa/Nairobi'},
    {id: 9, country: 'Monrovia', tz: 'Africa/Monrovia'},
    {id: 10, country: 'Tripoli', tz: 'Africa/Tripoli'},
    {id: 11, country: 'Casablanca', tz: 'Africa/Casablanca'},
    {id: 12, country: 'Maputo', tz: 'Africa/Maputo'},
    {id: 13, country: 'Windhoek', tz: 'Africa/Windhoek'},
    {id: 14, country: 'Lagos', tz: 'Africa/Lagos'},
    {id: 15, country: 'Khartoum', tz: 'Africa/Khartoum'},
    {id: 16, country: 'Juba', tz: 'Africa/Juba'},
    {id: 17, country: 'Sao_Tome', tz: 'Africa/Sao_Tome'},
    {id: 18, country: 'Ndjamena', tz: 'Africa/Ndjamena'},
    {id: 19, country: 'Tunis', tz: 'Africa/Tunis'},
    {id: 20, country: 'Johannesburg', tz: 'Africa/Johannesburg'},
  ],
},
{
  id: 8,
  continent: 'Atlantic',
  newRow: [
    {id: 1, country: 'Azores', tz: 'Atlantic/Azores'},
    {id: 2, country: 'Bermuda', tz: 'Atlantic/Bermuda'},
    {id: 3, country: 'Madeira', tz: 'Atlantic/Madeira'},
  ],
},
{
  id: 9,
  continent: 'Atlantic',
  newRow: [
    {id: 1, country: 'Cape_Verde', tz: 'Atlantic/Cape_Verde'},
    {id: 2, country: 'Canary', tz: 'Atlantic/Canary'},
    {id: 3, country: 'Stanley', tz: 'Atlantic/Stanley'},
    {id: 4, country: 'Faroe', tz: 'Atlantic/Faroe'},
    {id: 5, country: 'South_Georgia', tz: 'Atlantic/South_Georgia'},
    {id: 6, country: 'Reykjavik', tz: 'Atlantic/Reykjavik'},
  ],
},
{
  id: 10,
  continent: 'Indian',
  newRow: [
    {id: 1, country: 'Cocos', tz: 'Indian/Cocos'},
    {id: 2, country: 'Christmas', tz: 'Indian/Christmas'},
    {id: 3, country: 'Chagos', tz: 'Indian/Chagos'},
    {id: 4, country: 'Mauritius', tz: 'Indian/Mauritius'},
    {id: 5, country: 'Maldives', tz: 'Indian/Maldives'},
    {id: 6, country: 'Mahe', tz: 'Indian/Mahe'},
    {id: 7, country: 'Reunion', tz: 'Indian/Reunion'},
    {id: 8, country: 'Kerguelen', tz: 'Indian/Kerguelen'},
  ],
},

];

The marked answer doesn't seem to work for the Pacific/Honolulu timezone.

I've made another function that worked for that:

function getTimezoneOffset(timeZone) {
  const now = new Date();
  const tzString = now.toLocaleString('en-US', { timeZone });
  const localString = now.toLocaleString('en-US');
  const diff = (Date.parse(localString) - Date.parse(tzString)) / 3600000;
  const offset = diff + now.getTimezoneOffset() / 60;
  
  return -offset;
}

Usage example:

const offset = getTimezoneOffset('Pacific/Honolulu');

console.log(offset); // output: -10

The react-intl library's time zone functionality is provided exclusively by the ECMAScript Internationalization API features that are integrated into the browser.

While IANA time zone support is part of this spec, it currently only covers two scenarios:

• Formating a Date object to a string, converting to a specific time zone in the process.

• Determining the user's local time zone identifier.

Unfortunately, there is no function defined by the spec for enumerating the list of available time zones.

Additionally, note that support for the two functions it does have is currently limited to a handful of browsers. It will likely be quite some time before these capabilities can be depended upon. The ECMAScript Compatibility Table shows which browsers are supported. Under DateTimeFormat you'll find "resolvedOptions().timeZone defaults to the host environment" and "accepts IANA timezone names" that track these features.

Just for timezone list, adding a big package like moment is not recommended. Adding moment package will increase your application size and will slow down your application performance. Here is the latest timezones array

[
    "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/Nuuk",
    "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",
    "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/Kanton",
    "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/Samoa",
    "UTC",
    "Universal",
    "W-SU",
    "WET",
    "Zulu"
]

I did not find the list of time-zone through browser javascript so created array of timezone list and used it.

Option 1

Till Dec 25, 2020 in JAVA 11 ZoneRulesProvider.java

Create array/collection and use this without external library

I found 600 sorted TimeZone

'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','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','GB','GB-Eire','GMT','GMT0','Greenwich','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','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','ROK','Singapore','SystemV/AST4','SystemV/AST4ADT','SystemV/CST6','SystemV/CST6CDT','SystemV/EST5','SystemV/EST5EDT','SystemV/HST10','SystemV/MST7','SystemV/MST7MDT','SystemV/PST8','SystemV/PST8PDT','SystemV/YST9','SystemV/YST9YDT','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' 

Option 2

OS Valid 441 timezone, Extracted from Mac sudo systemsetup -listtimezones

'Africa/Abidjan','Africa/Accra','Africa/Addis_Ababa','Africa/Algiers','Africa/Asmara','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/Tripoli','Africa/Tunis','Africa/Windhoek','America/Adak','America/Anchorage','America/Anguilla','America/Antigua','America/Araguaina','America/Argentina/Buenos_Aires','America/Argentina/Catamarca','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/Bahia','America/Bahia_Banderas','America/Barbados','America/Belem','America/Belize','America/Blanc-Sablon','America/Boa_Vista','America/Bogota','America/Boise','America/Cambridge_Bay','America/Campo_Grande','America/Cancun','America/Caracas','America/Cayenne','America/Cayman','America/Chicago','America/Chihuahua','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/Fort_Nelson','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/Inuvik','America/Iqaluit','America/Jamaica','America/Juneau','America/Kentucky/Louisville','America/Kentucky/Monticello','America/Kralendijk','America/La_Paz','America/Lima','America/Los_Angeles','America/Lower_Princes','America/Maceio','America/Managua','America/Manaus','America/Marigot','America/Martinique','America/Matamoros','America/Mazatlan','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/Nuuk','America/Ojinaga','America/Panama','America/Pangnirtung','America/Paramaribo','America/Phoenix','America/Port-au-Prince','America/Port_of_Spain','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/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/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/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/Colombo','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/Jakarta','Asia/Jayapura','Asia/Jerusalem','Asia/Kabul','Asia/Kamchatka','Asia/Karachi','Asia/Kashgar','Asia/Kathmandu','Asia/Katmandu','Asia/Khandyga','Asia/Krasnoyarsk','Asia/Kuala_Lumpur','Asia/Kuching','Asia/Kuwait','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/Sakhalin','Asia/Samarkand','Asia/Seoul','Asia/Shanghai','Asia/Singapore','Asia/Srednekolymsk','Asia/Taipei','Asia/Tashkent','Asia/Tbilisi','Asia/Tehran','Asia/Thimphu','Asia/Tokyo','Asia/Tomsk','Asia/Ulaanbaatar','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/Faroe','Atlantic/Madeira','Atlantic/Reykjavik','Atlantic/South_Georgia','Atlantic/St_Helena','Atlantic/Stanley','Australia/Adelaide','Australia/Brisbane','Australia/Broken_Hill','Australia/Currie','Australia/Darwin','Australia/Eucla','Australia/Hobart','Australia/Lindeman','Australia/Lord_Howe','Australia/Melbourne','Australia/Perth','Australia/Sydney','Europe/Amsterdam','Europe/Andorra','Europe/Astrakhan','Europe/Athens','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/Kyiv','Europe/Lisbon','Europe/Ljubljana','Europe/London','Europe/Luxembourg','Europe/Madrid','Europe/Malta','Europe/Mariehamn','Europe/Minsk','Europe/Monaco','Europe/Moscow','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/Ulyanovsk','Europe/Uzhgorod','Europe/Vaduz','Europe/Vatican','Europe/Vienna','Europe/Vilnius','Europe/Volgograd','Europe/Warsaw','Europe/Zagreb','Europe/Zaporozhye','Europe/Zurich','GMT','Indian/Antananarivo','Indian/Chagos','Indian/Christmas','Indian/Cocos','Indian/Comoro','Indian/Kerguelen','Indian/Mahe','Indian/Maldives','Indian/Mauritius','Indian/Mayotte','Indian/Reunion','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/Kanton','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/Tahiti','Pacific/Tarawa','Pacific/Tongatapu','Pacific/Truk','Pacific/Wake','Pacific/Wallis'

I've been in this space for a bit.

The challenge I've had is balancing the comprehensiveness of the options returned by Intl.supportedValuesOf("timeZone") with something more readable.

Here's a little helper function I wrote that returns values like:

{
    "friendlyName": "Central Time",
    "offsetString": "GMT-05:00",
    "offsetNumeric": -300,
    "longTimezones": [
        "America/Chicago",
        "America/Indiana/Knox",
        "America/Indiana/Tell_City",
        "America/Matamoros",
        "America/Menominee",
        "America/North_Dakota/Beulah",
        "America/North_Dakota/Center",
        "America/North_Dakota/New_Salem",
        "America/Ojinaga",
        "America/Rainy_River",
        "America/Rankin_Inlet",
        "America/Resolute",
        "America/Winnipeg"
    ]
},
{
    "friendlyName": "Central Time (Chihuahua)",
    "offsetString": "GMT-06:00",
    "offsetNumeric": -360,
    "longTimezones": [
        "America/Chihuahua"
    ]
}

For my needs (which may not be everyone's :)), I've found that showing friendlyName (offsetString) gets the job done, and is a list of < 200 timezones, vs the full list of > 400.

Hope this helps!

You can do it using moment where you could list all zones using moment.tz.names() or list all zones in a country with moment.tz.zonesForCountry(String).

import moment from 'moment-timezone'

moment.tz.names(); // ["Africa/Abidjan", "Africa/Accra", "Africa/Addis_Ababa", ...]
moment.tz.zonesForCountry('US'); // ["America/Adak", "America/Anchorage", ... "Pacific/Honolulu"]

BTW if you need to get an alias like Eastern Daylight Time or EDT for your timezone I would recommend to use a helper function with Intl.DateTimeFormat like so

const getTimeZoneName = (timeZone: string, nameType: 'short' | 'long') => {
  const formatter = new Intl.DateTimeFormat(locale, { timeZone, timeZoneName: nameType })
  const formatted = formatter.formatToParts(new Date())

  return formatted.find(({ type }) => type === 'timeZoneName')?.value || ''
}

In react there re multiple ways to do so, but you can get all timezone using countries-and-timezones library.

first import the library:

import TimezoneCountries from "countries-and-timezones";

after importing, paste below code snippet to get list of all timezones.

export function getAllTimezones() {
  const allTimezones = Object.values(
    TimezoneCountries.getAllTimezones({ deprecated: true })
  ).map((list) => ({
    value: list.name,
    label: `${list.name}`,
  }));
  return allTimezones;
}

you can also get country name and utc offset by adding following lines

list.countries //to get country names in which timezone is used
list.utcOffsetStr //to get UTC offset

read more about library here.

I realize my answer is late, but I just created a package about this:

https://github.com/UltiRequiem/timezones

import {
  randomTimeZone,
  timeZones,
} from "https://deno.land/x/timezones/mod.ts";

console.log(`My timezone is ${randomTimeZone()}.`);

const date = new Date();

for (const timeZone of timeZones) {
  console.log(timeZone, date.toLocaleString("en-US", { timeZone }));
}

Supports

• Node.js

https://www.npmjs.com/package/@ultirequiem/timezones

• Deno

https://deno.land/x/timezones

• Browser

https://github.com/UltiRequiem/timezones#browser

Page: https://timezones.js.org

本文标签： How to get list of all timezones in javascriptStack Overflow