Temporal.ZonedDateTime.prototype.withCalendar()

Limited availability

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

See full compatibility

The withCalendar() method of Temporal.ZonedDateTime instances returns a new Temporal.ZonedDateTime object representing this date-time interpreted in the new calendar system. Because all Temporal objects are designed to be immutable, this method essentially functions as the setter for the date-time's calendarId property.

To replace the date-time component properties, use the with() method. To replace its time zone, use the withTimeZone() method.

Syntax

withCalendar(calendar)

Parameters

calendar: A string that corresponds to the calendarId property. See Intl.supportedValuesOf() for a list of commonly supported calendar types.

Return value

A new Temporal.ZonedDateTime object, representing the date-time specified by the original ZonedDateTime, interpreted in the new calendar system.

Exceptions

TypeError: Thrown if calendar is not a string.
RangeError: Thrown if calendar is not a valid calendar identifier.

Examples

Using withCalendar()

const zdt = Temporal.ZonedDateTime.from(
  "2021-07-01T12:34:56[America/New_York]",
);
const newZDT = zdt.withCalendar("islamic-umalqura");
console.log(newZDT.toLocaleString("en-US", { calendar: "islamic-umalqura" }));
// 11/21/1442 AH, 12:34:56 PM EDT

Specifications

Specification
Temporal # sec-temporal.zoneddatetime.prototype.withcalendar

Browser compatibility

	desktop					mobile							server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS	Bun	Deno	Node.js
`withCalendar`	Chrome – Full support Chrome 144 (Release date: 2026-01-13) footnote Full support	Edge – Full support Edge 144 (Release date: 2026-01-21) footnote Full support	Firefox – Partial support Firefox 139 (Release date: 2025-05-27) footnote Partial support footnote Calendars `islamic`, `islamic-rgsa` and `islamic-umalqura` are not available. See bug 1950425 and bug 1954138.	Opera – Full support Opera 128 (Release date: 2026-02-26) footnote Full support	Safari – No support Safari footnote footnote See bug 223166	Chrome Android – Full support Chrome Android 144 (Release date: 2026-01-13) footnote Full support	Firefox for Android – Partial support Firefox for Android 139 (Release date: 2025-05-27) footnote Partial support footnote Calendars `islamic`, `islamic-rgsa` and `islamic-umalqura` are not available. See bug 1950425 and bug 1954138.	Opera Android – Full support Opera Android 95 (Release date: 2026-02-11) footnote Full support	Safari on iOS – No support Safari on iOS footnote footnote See bug 223166	Samsung Internet – No support Samsung Internet footnote No support	WebView Android – Full support WebView Android 144 (Release date: 2026-01-13) footnote Full support	WebView on iOS – No support WebView on iOS footnote footnote See bug 223166	Bun – No support Bun footnote No support	Deno – Full support Deno 2.7 (Release date: 2026-02-25) footnote Full support	Node.js – No support Node.js footnote No support

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Full support: Full support
Partial support: Partial support
No support: No support
: See implementation notes.

Temporal.ZonedDateTime.prototype.withCalendar()

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