Temporal.PlainDateTime.prototype.weekOfYear

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 weekOfYear accessor property of Temporal.PlainDateTime instances returns a positive integer representing the 1-based week index in the yearOfWeek of this date, or undefined if the calendar does not have a well-defined week system. The first week of the year is 1. It is calendar-dependent.

The set accessor of weekOfYear is undefined. You cannot change this property directly. To create a new Temporal.PlainDateTime object with the desired new weekOfYear value, use the add() or subtract() method with the appropriate number of weeks.

For general information and more examples, see Temporal.PlainDate.prototype.weekOfYear.

Examples

Using weekOfYear

js
const dt = Temporal.PlainDateTime.from("2021-07-01");
console.log(dt.weekOfYear); // 26

Specifications

Specification
Temporal proposal
# sec-get-temporal.plaindatetime.prototype.weekofyear

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
weekOfYear
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