Types of calendars:

Solar calendar Lunar calendar Lunisolar calendar Christian calendar Islamic calendar Persian calendar Jewish calendar Julian calendar Gregorian calendar World calendar Chinese calendar Hebrew calendar Hindu calendar Fiscal calendar Japanese calendar Iranian calendar Revised Julian calendar Coptic calendar Thai solar calendar Thai lunar calendar Zoroastrian calendar Malayalam calendar Bahai calendar 53-week calendar Roman calendar Maya calendar Aztec calendar Egyptian calendar French Revolutionary Calendar Soviet revolutionary calendar Positivist calendar Babylonian calendar Darian calendar