Temporal.ZonedDateTime.prototype.dayOfYear

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 dayOfYear accessor property of Temporal.ZonedDateTime instances returns a positive integer representing the 1-based day index in the year of this date. The first day of this year is 1, and the last day is the daysInYear. It is calendar-dependent.

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

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

Examples

Using dayOfYear

js
const dt = Temporal.ZonedDateTime.from("2021-07-01[America/New_York]");
console.log(dt.dayOfYear); // 182

Specifications

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

Browser compatibility

BCD tables only load in the browser

See also