Temporal.PlainMonthDay.prototype.calendarId

The calendarId accessor property of {{jsxref("Temporal.PlainMonthDay")}} instances returns a string representing the calendar used to interpret the internal ISO 8601 date.

See Intl.supportedValuesOf() for a list of commonly supported calendar types.

The set accessor of calendarId is undefined. You cannot change this property directly. There's no obvious way to create a new Temporal.PlainMonthDay object with a different calendar that represents the same month-day, so you need to convert it to a {{jsxref("Temporal.PlainDate")}} object first using {{jsxref("Temporal/PlainMonthDay/toPlainDate", "toPlainDate()")}}, change the calendar, and then convert it back.

Examples#

Using calendarId#

const md = Temporal.PlainMonthDay.from("07-01");
console.log(md.calendarId); // "iso8601"; default

const md2 = Temporal.PlainMonthDay.from("2021-07-01[u-ca=chinese]");
console.log(md2.calendarId); // "chinese"

Changing calendarId#

const md = Temporal.PlainMonthDay.from("07-01");
const newMD = md
  .toPlainDate({ year: 2021 })
  .withCalendar("chinese")
  .toPlainMonthDay();
console.log(newMD.monthCode, newMD.day); // "M05" 22

const newMD2 = md
  .toPlainDate({ year: 2022 })
  .withCalendar("chinese")
  .toPlainMonthDay();
console.log(newMD2.monthCode, newMD2.day); // "M06" 3

Specifications#

{{Specifications}}

Browser compatibility#

{{Compat}}

See also#

• {{jsxref("Temporal.PlainMonthDay")}}