[dating systems by specific type]Gregorian calendarJulian calendarRoman calendarBuddhist calendarHindu calendarChinese calendarJewish calendarAssyro-Babylonian calendarAymara calendarAztec calendarBahai calendarInca calendarEgyptian calendarCeltic calendarCherokee calendarGreek calendarIslamic calendarTibetan calendarFrench republican calendarZoroastrian calendarNippur calendarCoptic calendarEthiopian calendarGermanic calendarMesoamerican calendar systemsMaramataka Māoricalendarsdating systemsdating systems by specific type