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

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()

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

Browser compatibility

See also

• Temporal.PlainMonthDay
• Temporal.PlainDate
• Temporal.PlainDate.prototype.toPlainMonthDay()