Anno Domini dating was first calculated in 525 and began to be adopted in Western Europe during the eighth century. The numbering of years per the Christian era is currently dominant in many places around the world, in both commercial and scientific use.

Who started BC and AD?

Dionysius Exiguus The BC/AD system was invented by a monk named Dionysius Exiguus who was trying to establish a Christian chronology; before his time one had to use some system more or less tainted with paganism, such as the AUC system (from Romes foundation) or consular dating (the year when X and Y were [Roman] consuls - by the

When did BC end and ad start?

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.

When did BC become BCE?

The year 1 BCE immediately precedes the year 1 CE. Or, if you prefer, the year 1 BC immediately precedes the year AD 1. Thats why the years from 1 to 100 make up the 1st century (1 to 100), and the years from 2001 to 2100 comprise the 21st century (2001 to 2100).