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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... :/
808
To get the current browser's time zone, you can use the getTimezoneOffset() method from the JavaScript Date object. The getTimezoneOffset() returns the time difference, in minutes, between UTC time and local time.
var tz = moment. tz. guess(); It will return an IANA time zone identifier, such as America/Los_Angeles for the US Pacific time zone.
Open DevTools in Chrome -> Open the Console drawer. Click on the three-dotted menu -> Click on More tools -> Sensors. From the Sensors tab, set the location according to your preference and define the specific timezone.
The world is divided into 24 time zones. The course of one day is broken down to the seconds and calculated to define the correct time of a particular place. However, it is not that easy. The 24 time zones, created in accordance to each hour of the day, are theoretically drawn vertically like longitudes over the globe.
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 aryIannaTimeZones = [
'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;
aryIannaTimeZones.forEach((timeZone) =>
{
let strTime = date.toLocaleString("en-US", {timeZone: `${timeZone}`});
console.log(timeZone, strTime);
});If you're like me, in wondering why there are so many timezones, check out this question.
UPDATE 2022-06-08:
If you only need a full list of time zones that your environment supports, you can now acquire that array using Intl.supportedValuesOf(), like this:
let ary = Intl.supportedValuesOf('timeZone');
Whether that list is complete or not, will depend on your environment.
In the snippet below, I replace that array (from the first snippet) with Intl.supportedValuesOf('timeZone'):
var aryIannaTimeZones = Intl.supportedValuesOf('timeZone');
let date = new Date;
aryIannaTimeZones.forEach((timeZone) =>
{
let strTime = date.toLocaleString("en-US",{timeZone: `${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:
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.
121
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 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!
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