The monthCode accessor property of Temporal.PlainMonthDay instances returns a calendar-specific string representing the month of this date. It is calendar-dependent.

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The era accessor property of Temporal.PlainDate instances returns a calendar-specific lowercase string representing the era of this date, 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. For Gregorian, it is either "gregory" or "gregory-inverse".

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

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The valueOf() method of Temporal.PlainDateTime instances throws a TypeError, which prevents Temporal.PlainDateTime instances from being implicitly converted to primitives when used in arithmetic or comparison operations.

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The add() method of Temporal.ZonedDateTime instances returns a new Temporal.ZonedDateTime object representing this date-time moved forward by a given duration (in a form convertible by Temporal.Duration.from()).

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