Gregorian calendar
The Gregorian calendar is a solar calendar introduced in 1582 as a reform of the Julian calendar. Its leap-year rule produces 97 leap years in every 400-year cycle: century years omit the leap day unless they are divisib…
The Gregorian calendar is a solar calendar introduced in 1582 as a reform of the Julian calendar. Its leap-year rule produces 97 leap years in every 400-year cycle: century years omit the leap day unless they are divisib…
The Islamic (Hijri) calendar is a lunar calendar whose year count begins with the Hijra, the migration of the Prophet Muhammad from Mecca to Medina in 622 CE. It consists of twelve lunar months; because its year is short…