Temporal.ZonedDateTime.prototype.hour

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 hour accessor property of Temporal.ZonedDateTime instances returns a integer from 0 to 23 representing the hour component of this time.

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

For general information and more examples, see Temporal.PlainTime.prototype.hour.

For ZonedDateTime, hour can be non-continuous due to offset changes such as daylight saving time transitions. In this case, the hour may be repeated or skipped.

Examples

Using hour

js
const dt = Temporal.ZonedDateTime.from(
  "2021-07-01T12:34:56.123456789-04:00[America/New_York]",
);
console.log(dt.hour); // 12

Non-continuous hour

Non-continuous hour is very common due to daylight saving time transitions, which is explained more in Ambiguity and gaps from local time to UTC time.

js
const dt = Temporal.ZonedDateTime.from(
  "2024-11-03T01:59:00-04:00[America/New_York]",
);
console.log(dt.hour); // 1
const dt2 = dt.add({ minutes: 1 });
console.log(dt2.hour); // 1
console.log(dt2.toString()); // 2024-11-03T01:00:00-05:00[America/New_York]

const dt3 = Temporal.ZonedDateTime.from(
  "2024-03-10T01:59:00-05:00[America/New_York]",
);
console.log(dt3.hour); // 1
const dt4 = dt3.add({ minutes: 1 });
console.log(dt4.hour); // 3
console.log(dt4.toString()); // 2024-03-10T03:00:00-04:00[America/New_York]

For this reason, you should always prefer add() and subtract() to manipulate dates and times, rather than directly changing the hour property.

Specifications

Specification
Temporal proposal
# sec-get-temporal.zoneddatetime.prototype.hour

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
hour
Experimental

Legend

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

No support
No support
Experimental. Expect behavior to change in the future.
See implementation notes.
User must explicitly enable this feature.

See also