Temporal.Instant.fromEpochMilliseconds()

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 Temporal.Instant.fromEpochMilliseconds() static method creates a new Temporal.Instant object from the number of milliseconds since the Unix epoch (midnight at the beginning of January 1, 1970, UTC).

To convert a Date object to a Temporal.Instant object, use Date.prototype.toTemporalInstant() instead.

Syntax

Temporal.Instant.fromEpochMilliseconds(epochMilliseconds)

Parameters

epochMilliseconds: A number representing the number of milliseconds since the Unix epoch. Internally, it is converted to a BigInt and multiplied by 1e6 to get the number of nanoseconds.

Return value

A new Temporal.Instant object representing the instant in time specified by epochMilliseconds.

Exceptions

RangeError: Thrown if epochMilliseconds is outside the range of a representable instant, which is ±10⁸ days (±8.64e15 milliseconds, or about ±273,972.6 years), or if it cannot be converted to a BigInt (e.g., not an integer).

Examples

Using Temporal.Instant.fromEpochMilliseconds()

const instant = Temporal.Instant.fromEpochMilliseconds(0);
console.log(instant.toString()); // 1970-01-01T00:00:00Z
const vostok1Liftoff = Temporal.Instant.fromEpochMilliseconds(-275248380000);
console.log(vostok1Liftoff.toString()); // 1961-04-12T06:07:00Z
const sts1Liftoff = Temporal.Instant.fromEpochMilliseconds(355924804000);
console.log(sts1Liftoff.toString()); // 1981-04-12T12:00:04Z

Specifications

Specification
Temporal proposal # sec-temporal.instant.fromepochmilliseconds

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
`fromEpochMilliseconds`	No	No	No	No	preview	No	No	No	No	No	No	1.40	No