Represents a whole or partial calendar date, such as a birthday. The time of day and time zone are either specified elsewhere or are insignificant. The date is relative to the Gregorian Calendar. This can represent one of the following:
A full date, with non-zero year, month, and day values. A month and day, with a zero year (for example, an anniversary). A year on its own, with a zero month and a zero day. A year and month, with a zero day (for example, a credit card expiration date).
Day of the date. Must be from 1 to 31 and valid for the year and month. or 0 to specify a year by itself or a year and month where the day isn't significant
month
month?: number;
Month of the date. Must be from 1 to 12, or 0 to specify a year without a monthi and day.
year
year?: number;
Year of the date. Must be from 1 to 9999, or 0 to specify a date without a year.
