Nisan

Nisan (or Nissan; , Standard Nisan Tiberian Nîsan) on the Assyrian calendar is the first month and on the Hebrew calendar is the first month of the ecclesiastical year and the seventh month (eighth, in leap year) of the civil year. The name of the month is Babylonian; in the Torah it is called the month of the Aviv. Assyrians refer to the month as the "month of happiness." It is a spring month of 30 days. (Nisan usually falls in March–April) on the Gregorian calendar. In the Book of Esther in the Tanakh it is referred to as Nisan. Karaite Jews interpret it as referring to the month in which barley was ripe.