The year accessor property of Temporal.PlainDateTime instances returns an integer representing the number of years of this date relative to the start of a calendar-specific epoch year. It is calendar-dependent.
The set accessor of year 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.year.
const dt = Temporal.PlainDateTime.from("2021-07-01"); // ISO 8601 calendar
console.log(dt.year); // 2021Temporal.PlainDateTimeTemporal.PlainDateTime.prototype.with()Temporal.PlainDateTime.prototype.add()Temporal.PlainDateTime.prototype.subtract()Temporal.PlainDateTime.prototype.eraTemporal.PlainDateTime.prototype.eraYearTemporal.PlainDateTime.prototype.yearOfWeekTemporal.PlainDateTime.prototype.monthTemporal.PlainDateTime.prototype.dayTemporal.PlainDate.prototype.year