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

js
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.

js
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.

js
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 proposal
# sec-get-temporal.zoneddatetime.prototype.timezoneid

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
timeZoneId
Experimental

Legend

Tip: you can click/tap on a cell for more information.

No support
No support
Experimental. Expect behavior to change in the future.
See implementation notes.
User must explicitly enable this feature.

See also