Temporal.PlainMonthDay.prototype.toPlainDate()

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 toPlainDate() method of Temporal.PlainMonthDay instances returns a new Temporal.PlainDate object representing this month-day and a supplied year in the same calendar system.

Syntax

js
toPlainDate(yearInfo)

Parameters

yearInfo

An object representing the year component of the resulting PlainDate, containing the following properties (in the order they are retrieved and validated):

era and eraYear

A string and an integer that correspond to the era and eraYear properties. Are only used if the calendar system has eras. era and eraYear must be provided simultaneously. If they are not provided, then year must be provided. If all of era, eraYear, and year are provided, they must be consistent.

year

Corresponds to the year property.

Return value

A new Temporal.PlainDate object representing the date specified by this month-day and the year in yearInfo, interpreted in the calendar system of this month-day.

Exceptions

RangeError

Thrown if any of the options is invalid.

TypeError

Thrown if yearInfo is not an object.

Examples

Using toPlainDate()

js
const md = Temporal.PlainMonthDay.from("07-01");
const date = md.toPlainDate({ year: 2021 });
console.log(date.toString()); // 2021-07-01

const md2 = Temporal.PlainMonthDay.from("2021-07-01[u-ca=japanese]");
const date2 = md2.toPlainDate({ era: "reiwa", eraYear: 1 });
console.log(date2.toString()); // 2019-07-01[u-ca=japanese]

Specifications

Specification
Temporal proposal
# sec-temporal.plainmonthday.prototype.toplaindate

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
toPlainDate
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