What two calendars are different from the western calendar?

Two calendars that differ from the Western Gregorian calendar are the Islamic (Hijri) calendar and the Hebrew (Jewish) calendar. The Islamic calendar is a lunar calendar consisting of 12 months, totaling about 354 days, which causes its months to shift annually with respect to the Gregorian calendar. In contrast, the Hebrew calendar is lunisolar, incorporating both lunar months and solar years, resulting in an average year length of about 354 days, with periodic leap months added to align with the solar year.