What Is The First Month In The Jewish Calendar. What is the first month of the jewish calendar? For example, rosh hashanah must begin on a new (crescent) moon, on the first day of the month of tishri;

To find the corresponding jewish year for any year on the gregorian calendar, add 3760 to the gregorian number, if it is before rosh hashanah. For religious purposes, the hebrew calendar is used to determine the dates of jewish holidays and festivals.