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()).

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.

Used for indexing operations (`container[index]`) in mutable contexts.

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 toPlainDate() method of Temporal.PlainYearMonth instances returns a new Temporal.PlainDate object representing this year-month and a supplied day in the same calendar system.

`X` formatting.

The epochNanoseconds accessor property of Temporal.Instant instances returns a BigInt representing the number of nanoseconds elapsed since the Unix epoch (midnight at the beginning of January 1, 1970, UTC) to this instant.

The toString() method of Temporal.PlainYearMonth instances returns a string representing this year-month in the RFC 9557 format.

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

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