CALENDAR

The calendar is based on a 365-day common year divided into 12 months of irregular lengths. 11 of the months have either 30 or 31 days, while the second month, February, has only 28 days during the common year. Nearly every four years is a leap year, when one extra day is added on 29 February, making the leap year in the Gregorian calendar 366 days long.⁰