The year accessor property of Temporal.PlainDate instances returns an integer representing the number of years of this date relative to the start of a calendar-specific epoch year. This property has the same function as the era/eraYear pair as a unique identifier of a year in a calendar. It is calendar-dependent.

The toJSON() method of Temporal.PlainDateTime instances returns a string representing this date-time in the same RFC 9557 format as calling toString(). It is intended to be implicitly called by JSON.stringify().

The era accessor property of Temporal.PlainYearMonth instances returns a calendar-specific lowercase string representing the era of this year-month, or undefined if the calendar does not use eras (e.g., ISO 8601). era and eraYear together uniquely identify a year in a calendar, in the same way that year does. It is calendar-dependent.

The microsecond accessor property of Temporal.PlainTime instances returns an integer from 0 to 999 representing the microsecond (10-6 second) component of this time.

The toPlainDate() method of Temporal.ZonedDateTime instances returns a new Temporal.PlainDate object representing the date portion of this date-time.

The hour accessor property of Temporal.PlainTime instances returns an integer from 0 to 23 representing the hour component of this time.

The millisecond accessor property of Temporal.PlainDateTime instances returns an integer from 0 to 999 representing the millisecond (10-3 second) component of this time.

The second accessor property of Temporal.PlainTime instances returns an integer from 0 to 59 representing the second component of this time.

The epochMilliseconds accessor property of Temporal.ZonedDateTime instances returns an integer representing the number of milliseconds elapsed since the Unix epoch (midnight at the beginning of January 1, 1970, UTC) to this instant. It is equivalent to dividing epochNanoseconds by 1e6 and flooring the result.

The format() method of Intl.DateTimeFormat instances formats a date according to the locale and formatting options of this Intl.DateTimeFormat object.