Temporal.ZonedDateTime.prototype.epochMilliseconds
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The epochMilliseconds accessor property of Temporal.ZonedDateTime instances returns an integer representing the number of milliseconds elapsed since the Unix epoch (midnight at the beginning of January 1, 1970, UTC) to this instant. It is equivalent to dividing epochNanoseconds by 1e6 and flooring the result.
The set accessor of epochMilliseconds is undefined. You cannot change this property directly. To create a new Temporal.ZonedDateTime object with the desired new epochMilliseconds value, see below.
Examples
Using epochMilliseconds
const zdt = Temporal.ZonedDateTime.from("2021-08-01T12:34:56.789Z[UTC]");
console.log(zdt.epochMilliseconds); // 1627821296789
const zdt2 = Temporal.ZonedDateTime.from("1969-08-01T12:34:56.789Z[UTC]");
console.log(zdt2.epochMilliseconds); // -13173903211
Creating a ZonedDateTime object from an epochMilliseconds value
You can create a Temporal.ZonedDateTime object from an epochMilliseconds value by first constructing a Temporal.Instant object using Temporal.Instant.fromEpochMilliseconds(), and then converting it to a Temporal.ZonedDateTime object using Temporal.Instant.prototype.toZonedDateTimeISO():
const epochMilliseconds = 1627821296789;
const instant = Temporal.Instant.fromEpochMilliseconds(epochMilliseconds);
const zdt = instant.toZonedDateTimeISO("UTC");
console.log(zdt.toString()); // 2021-08-01T12:34:56.789+00:00[UTC]
Alternatively, use the Temporal.ZonedDateTime() constructor, but convert the milliseconds to nanoseconds first:
const epochMilliseconds = 1627821296789;
const epochNanoseconds = BigInt(epochMilliseconds) * 1_000_000n;
const zdt = new Temporal.ZonedDateTime(epochNanoseconds, "UTC");
console.log(zdt.toString()); // 2021-08-01T12:34:56.789+00:00[UTC]
Specifications
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| Temporal # sec-get-temporal.zoneddatetime.prototype.epochmilliseconds |
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- See implementation notes.