The add() method of Temporal.PlainTime instances returns a new Temporal.PlainTime object representing this time moved forward by a given duration (in a form convertible by Temporal.Duration.from()), wrapping around the clock if necessary.

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. It is calendar-dependent.

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 Temporal.PlainYearMonth() constructor creates Temporal.PlainYearMonth objects.

The withTimeZone() method of Temporal.ZonedDateTime instances returns a new Temporal.ZonedDateTime object representing the same instant as this date-time but in the new time zone. Because all Temporal objects are designed to be immutable, this method essentially functions as the setter for the date-time's timeZoneId property.

The eraYear accessor property of Temporal.PlainDateTime instances returns a non-negative integer representing the year of this date within the era, or undefined if the calendar does not use eras (e.g., ISO 8601). The year index usually starts from 1 (more common) or 0, and years in an era can decrease with time (e.g., Gregorian BCE). era and eraYear together uniquely identify a year in a calendar, in the same way that year does. It is calendar-dependent.

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