The toZonedDateTime() method of Temporal.PlainDateTime instances returns a new Temporal.ZonedDateTime instance representing the same date-time as this plain date-time, but in the specified time zone.

The daysInYear accessor property of Temporal.ZonedDateTime instances returns a positive integer representing the number of days in the year of this date. It is calendar-dependent.

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

The year accessor property of Temporal.ZonedDateTime 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 epochNanoseconds accessor property of Temporal.ZonedDateTime 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 Symbol.iterator static data property represents the well-known symbol Symbol.iterator. The iterable protocol looks up this symbol for the method that returns the iterator for an object. In order for an object to be iterable, it must have an [Symbol.iterator] key.

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The [Symbol.iterator]() method of Iterator instances implements the iterable protocol and allows built-in iterators to be consumed by most syntaxes expecting iterables, such as the spread syntax and for...of loops. It returns the value of this, which is the iterator object itself.

The toISOString() method of Date instances returns a string representing this date in the date time string format, a simplified format based on ISO 8601, which is always 24 or 27 characters long (YYYY-MM-DDTHH:mm:ss.sssZ or ±YYYYYY-MM-DDTHH:mm:ss.sssZ, respectively). The timezone is always UTC, as denoted by the suffix Z.