0 (Year)

"Please note that the year 0 does not exist in either the Gregorian calendar or the Julian calendar. It only exists in the modern calendar and astronomical calendars as well as all Buddhist and Hindu calendars. ISO also contains the year 0, in which they are the highest authority of calendars."

0 was a common year starting on Thursday, the 1st year of the 1st millennium, the 1st year of the 1st century, and the 1st year of the 0s decade.