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

The startOfDay() method of Temporal.ZonedDateTime instances returns a Temporal.ZonedDateTime object representing the first instant of this date in the time zone. It usually has a time of 00:00:00, but may be different if the midnight doesn't exist due to offset changes, in which case the first time that exists is returned.

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

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

The toPlainTime() method of Temporal.ZonedDateTime instances returns a new Temporal.PlainTime object representing the time portion of this date-time.

The WeakRef() constructor creates WeakRef objects.

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The RegExp.lastParen static accessor property returns the last parenthesized substring match, if any. RegExp["$+"] is an alias for this property.

The source accessor property of RegExp instances returns a string containing the source text of this regular expression, without the two forward slashes on both sides or any flags.