Temporal.Instant.prototype.epochMilliseconds
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 epochMilliseconds
accessor property of Temporal.Instant
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.Instant
object with the desired new epochMilliseconds
value, use the Temporal.Instant.fromEpochMilliseconds()
static method instead.
Examples
Using epochMilliseconds
const instant = Temporal.Instant.from("2021-08-01T12:34:56.789Z");
console.log(instant.epochMilliseconds); // 1627821296789
const instant2 = Temporal.Instant.from("1969-08-01T12:34:56.789Z");
console.log(instant2.epochMilliseconds); // -13173903211
Changing epochMilliseconds
This is the method that allows you to move by any amount of time:
const instant = Temporal.Instant.from("2021-08-01T12:34:56.789Z");
const instant1hourLater = instant.add({ hours: 1 });
console.log(instant1hourLater.epochMilliseconds); // 1627824896789
If you already know the change in milliseconds, you can also directly construct a new Temporal.Instant
object:
const instant = Temporal.Instant.from("2021-08-01T12:34:56.789Z");
const instant1hourLater = Temporal.Instant.fromEpochMilliseconds(
instant.epochMilliseconds + 3600000,
);
console.log(instant1hourLater.epochMilliseconds); // 1627824896789
Specifications
Specification |
---|
Temporal proposal # sec-get-temporal.instant.prototype.epochmilliseconds |
Browser compatibility
Report problems with this compatibility data on GitHubdesktop | mobile | server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
epochMilliseconds |
Legend
Tip: you can click/tap on a cell for more information.
- In development. Supported in a pre-release version.
- In development. Supported in a pre-release version.
- No support
- No support
- Experimental. Expect behavior to change in the future.
- See implementation notes.
- User must explicitly enable this feature.