Dates

A date is a three-part value (day, month, year) designating a day according to the Gregorian calendar. The range of the year part is 1 to 9␠999. The range of the month part is 1 to 12. The range of the day part is 1 to x, where x depends on the month.

All computations on dates are performed as if the Gregorian calendar was in effect since year 0001.