The era accessor property of Temporal.PlainDateTime 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.

The nanosecond accessor property of Temporal.ZonedDateTime instances returns an integer from 0 to 999 representing the nanosecond (10-9 second) component of this time.

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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.

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

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