A year zero does not exist in the Anno Domini (AD) calendar year system commonly used to number years in the Gregorian calendar (nor in its predecessor, the Julian calendar); in this system, the year 1 BC is followed directly by year AD 1. And there is a year zero in most Buddhist and Hindu calendars.
What happened Year 0?
Well, actually there is no year 0; the calendar goes straight from 1 BC to 1 AD, complicating the process of calculating years. Most scholars believe that Jesus was born between 6 and 4 BC (Before Christ) and that he died between 30 and 36 AD (Anno Domini, latin for in the year of the lord).
Is the first year 0 or 1?
Why? Based on our numbering system, Anno domini, there is no year zero. The year 1 BC was not followed by 0, but rather by year AD 1, so we count up from the year 1 AD as in the “21st century.”
Is there a year 999?
Year 999 (CMXCIX) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar .AD 999.Millennium:1st millenniumYears:996 997 998 999 1000 1001 10022 more rows