Julian / Gregorian Calendar AC BC

Julian / Gregorian Calendar AD / BC

The short form, term or acronym A.D. stands for 'Anno Domini' - a Medieval Latin phrase. It means 'In the Year of the Lord'. 

The term B.C. is used to label or number years in the Julian and Gregorian calendars preceding the birth of Jesus. 

This calendar era is based on the traditional birth of Jesus of Nazareth, with AD counting years from the start of his birth, while BC indicates years before the start of the era. There is no year zero in this scheme, so the year AD 1 immediately follows the year 1 BC. 

Hence AD 1 starts from the time of the Birth of Jesus, his crucifixion being AD 33.

Therefore A.D. does not mean 'After Death'.