Temporal.ZonedDateTime.prototype.timeZoneId

Limited availability

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

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The timeZoneId accessor property of Temporal.ZonedDateTime instances returns a string representing the time zone identifier used to interpret the internal instant. The string is either a named identifier in the preferred case (such as "America/New_York"), or an offset in the form "±hh:mm". If the time zone has aliases, the timeZoneId is the identifier used to create the ZonedDateTime, without canonicalization to the primary identifier.

The set accessor of timeZoneId is undefined. You cannot change this property directly. Use the withTimeZone() method to create a new Temporal.ZonedDateTime object with the desired new value.

Note: This string is not intended for display to users. Use toLocaleString() with the appropriate options to get a localized string.

Examples

Using timeZoneId

const dt = Temporal.ZonedDateTime.from(
  "2021-07-01T12:00:00-07:00[America/Los_Angeles]",
);
console.log(dt.timeZoneId); // "America/Los_Angeles"

const dt2 = Temporal.ZonedDateTime.from("2021-07-01T12:00:00-07:00[-07:00]");
console.log(dt2.timeZoneId); // "-07:00"

const dt3 = dt2.withTimeZone("Asia/Shanghai");
console.log(dt3.timeZoneId); // "Asia/Shanghai"

The timeZoneId is never canonicalized to the primary identifier; it is the same as the one used to create the ZonedDateTime.

const dt = Temporal.ZonedDateTime.from(
  "2021-07-01T12:00:00+07:00[Asia/Ho_Chi_Minh]",
);
const dt2 = Temporal.ZonedDateTime.from(
  "2021-07-01T12:00:00+07:00[Asia/Saigon]",
);
console.log(dt.timeZoneId); // "Asia/Ho_Chi_Minh"
console.log(dt2.timeZoneId); // "Asia/Saigon"

However, presentational differences will get canonicalized.

const dt = Temporal.ZonedDateTime.from(
  "2021-07-01T12:00:00+07:00[asia/ho_chi_minh]",
);
console.log(dt.timeZoneId); // "Asia/Ho_Chi_Minh"

const dt2 = Temporal.ZonedDateTime.from("2021-07-01T12:00:00+07:00[+07]");
console.log(dt2.timeZoneId); // "+07:00"

Specifications

Specification
Temporal # sec-get-temporal.zoneddatetime.prototype.timezoneid

Browser compatibility

	Desktop					Mobile						Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	Deno	Node.js
`timeZoneId`	No	No	139	No	No	No	139	No	No	No	No	1.40	No

Examples

Using timeZoneId

Specifications

Browser compatibility

See also