Is There a Year Zero?

How BC transitions to AD

Johannes von Gmunden Calendar (Public domain)

The world counts years with the Anno Domini (AD) system in which the current era is counted from the birth of Jesus Christ. Scholars and secular students have started using Common Era (CE) to replace AD but the numbering is exactly the same. Prior to AD we have Before Christ (BC) or Before Common Era (BCE) which denotes the years leading up to the birth of Christ.