The term 'Month in the Jewish Calendar' refers to two months in particular: ADAR and Nisan. ADAR is the twelfth month of the Jewish calendar, which usually falls in February or March. It is a month of celebration and joy, as it marks the beginning of the Jewish holiday of Purim. Nisan is the first month of the Jewish calendar, which usually falls in March or April. It is a month of remembrance and reflection, as it marks the beginning of the Jewish holiday of Passover.