Temporal.PlainDateTime.prototype.monthCode

The monthCode accessor property of Temporal.PlainDateTime instances returns a calendar-specific string representing the month of this date. It is calendar-dependent.

Usually it is M plus a two-digit month number. For leap months, it is the previous month's code followed by L (even if it's conceptually a derivative of the following month; for example, in the Hebrew calendar, Adar I has code M05L but Adar II has code M06). If the leap month is the first month of the year, the code is M00L.

The set accessor of monthCode is undefined. You cannot change this property directly. Use the with() method to create a new Temporal.PlainDateTime object with the desired new value.

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

const date = Temporal.PlainDateTime.from("2021-07-01"); // ISO 8601 calendar
console.log(date.monthCode); // "M07"
console.log(date.month); // 7