Intl.Locale.prototype.getTimeZones()

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

The getTimeZones() method of Intl.Locale instances returns a list of supported time zones for this locale.

Note: In some versions of some browsers, this method was implemented as an accessor property called timeZones. However, because it returns a new array on each access, it is now implemented as a method to prevent the situation of locale.timeZones === locale.timeZones returning false. Check the browser compatibility table for details.

Syntax

getTimeZones()

Parameters

None.

Return value

An array of strings representing supported time zones for the associated Locale, where each value is an IANA time zone canonical name, sorted in alphabetical order. If the locale identifier does not contain a region subtag, the returned value is undefined.

Note that while the IANA database changes from time to time, the Unicode CLDR database (which browsers use) keeps old time zone names for stability purposes. For example, here are a few notable name changes:

Current IANA name	CDLR database
`America/Argentina/Buenos_Aires`	`America/Buenos_Aires`
`Asia/Kolkata`	`Asia/Calcutta`
`Asia/Ho_Chi_Minh`	`Asia/Saigon`
`Europe/Kyiv`	`Europe/Kiev`

Some browsers (Firefox) override these legacy names, while others don't (Safari and Chrome). For more information, check the CLDR database. (IANA names are marked with "_iana", if different.) There is an effort in TC39 to properly handle these canonical identifiers, which also contains links to related CLDR issues.

Examples

Obtaining supported time zones

List supported time zones for a given Locale.

const arEG = new Intl.Locale("ar-EG");
console.log(arEG.getTimeZones()); // ["Africa/Cairo"]

const jaJP = new Intl.Locale("ja-JP");
console.log(jaJP.getTimeZones()); // ["Asia/Tokyo"]

const ar = new Intl.Locale("ar");
console.log(ar.getTimeZones()); // undefined

Specifications

Specification
Intl Locale Info Proposal # sec-Intl.Locale.prototype.getTimeZones

Browser compatibility

BCD tables only load in the browser