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 in one of the following cases:

• epochMilliseconds cannot be converted to a BigInt (e.g., not an integer).
• epochMilliseconds is not in the representable range, which is ±10⁸ days, or about ±273,972.6 years, from the Unix epoch.

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

Browser compatibility

See also

• Temporal.Instant
• Temporal.Instant.prototype.epochMilliseconds
• Temporal.Instant.from()
• Temporal.Instant.fromEpochNanoseconds()
• Date.prototype.toTemporalInstant()