The eraYear accessor property of Temporal.PlainDate 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.

The subtract() method of Temporal.PlainYearMonth instances returns a new Temporal.PlainYearMonth object representing this year-month moved backward by a given duration (in a form convertible by Temporal.Duration.from()).

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

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The BigInt() function returns primitive values of type BigInt.

The suppressed data property of a SuppressedError instance contains a reference to the original error that got suppressed because a new error was generated while handling it.