There is no zero year -- in this system, the year Christ was born is 1 A.D., and the year preceding it is 1 B.C. This practice was first suggested in the sixth century A.D., and was adopted by the pope of that time. It took quite a while for it to become a worldwide standard, however.

What year did BC end and AD begin?

This calendar era is based on the traditionally reckoned year of the conception or birth of Jesus, with AD counting years from the start of this epoch and BC denoting years before the start of the era. There is no year zero in this scheme; thus the year AD 1 immediately follows the year 1 BC.

What year did BC start?

The 1st century BC, also known as the last century BC, started on the first day of 100 BC and ended on the last day of 1 BC .1st century BC.Millennium:1st millennium BCState leaders:2nd century BC 1st century BC 1st century AD4 more rows