Temporal.PlainTime.prototype.millisecond

Limited availability

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

The millisecond accessor property of Temporal.PlainTime instances returns an integer from 0 to 999 representing the millisecond (10-3 second) component of this time.

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

Examples

Using millisecond

js
const time = Temporal.PlainTime.from("12:34:56");
console.log(time.millisecond); // 0

const time2 = Temporal.PlainTime.from("12:34:56.123456789");
console.log(time2.millisecond); // 123

Changing millisecond

js
const time = Temporal.PlainTime.from("12:34:56");
const newTime = time.with({ millisecond: 100 });
console.log(newTime.toString()); // 12:34:56.1

You can also use add() or subtract() to move a certain number of milliseconds from the current time.

js
const time = Temporal.PlainTime.from("12:34:56");
const newTime = time.add({ milliseconds: 100 });
console.log(newTime.toString()); // 12:34:56.1

Specifications

Specification
Temporal
# sec-get-temporal.plaintime.prototype.millisecond

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
millisecond
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 – Full support
Firefox 139 (Release date: 2025-05-27)
footnote Full support
Opera – Full support
Opera 128 (Release date: 2026-02-26)
footnote Full support
Safari – Preview support
Safari TP
footnote
footnote See bug 223166
footnote Preview browser support
Chrome Android – Full support
Chrome Android 144 (Release date: 2026-01-13)
footnote Full support
Firefox for Android – Full support
Firefox for Android 139 (Release date: 2025-05-27)
footnote Full support
Opera Android – Full support
Opera Android 95 (Release date: 2026-02-11)
footnote Full support
Safari on iOS – No support
Safari on iOS
footnote No support
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 No support
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

Legend

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

Full support
Full support
In development. Supported in a pre-release version.
In development. Supported in a pre-release version.
No support
No support
See implementation notes.

See also