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Year zero

year (doesn't exist in AD system)
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Year zero does not exist in the Anno Domini (AD) system usually used to number years in the Gregorian calendar and Julian calendar. In this system, the year 1 BC is followed by AD 1. However, there is a year zero in astronomical year numbering (where it coincides with the Julian year 1 BC) and in ISO 8601:2004 (where it coincides with the Gregorian year 1 BC) as well as in all Buddhist and Hindu calendars.