The toZonedDateTimeISO() method of Temporal.Instant instances returns a new Temporal.ZonedDateTime object representing this instant in the specified time zone using the ISO 8601 calendar system.

The toPlainDateTime() method of Temporal.PlainDate instances returns a new Temporal.PlainDateTime object representing this date and a supplied time in the same calendar system.

The dayOfYear accessor property of Temporal.PlainDate instances returns a positive integer representing the 1-based day index in the year of this date. The first day of this year is 1, and the last day is the daysInYear. It is calendar-dependent.

The Temporal.PlainDate.from() static method creates a new Temporal.PlainDate object from another Temporal.PlainDate object, an object with date properties, or an RFC 9557 string.

The since() method of Temporal.ZonedDateTime instances returns a new Temporal.Duration object representing the duration from another date-time (in a form convertible by Temporal.ZonedDateTime.from()) to this date-time. The duration is positive if the other date-time is before this date-time, and negative if after.

The calendarId accessor property of Temporal.PlainMonthDay instances returns a string representing the calendar used to interpret the internal ISO 8601 date.

The daysInMonth accessor property of Temporal.PlainDate instances returns a positive integer representing the number of days in the month of this date. It is calendar-dependent.

The setFromBase64() method of Uint8Array instances populates this Uint8Array object with bytes from a base64-encoded string, returning an object indicating how many bytes were read and written.

The Uint8Array() constructor creates Uint8Array objects. The contents are initialized to 0 unless initialization data is explicitly provided.

The calendarId accessor property of Temporal.PlainYearMonth instances returns a string representing the calendar used to interpret the internal ISO 8601 date.