The Jewish calendar starter is Tishri, which is the seventh month of the Jewish year. It is the first month of the civil year and the first month of the ecclesiastical year. Tishri usually falls in September or October and is the most important month of the Jewish year, as it marks the beginning of the High Holy Days. It is a time of reflection and repentance, and is also the month in which the Jewish New Year, Rosh Hashanah, is celebrated.