Adar (Hebrew: ????? Adar; from Akkadian adaru) is the sixth month of the civil year and the twelfth month of the ecclesiastical year on the Hebrew calendar, roughly corresponding to the month of March in the Gregorian calendar. It is a winter month of 29 days. The key Purim-related liberating wartime events and main mention of the month appear in the holy scripture of Esther 9, its last book.