A.D.
(English: Common Era, abbreviated as CE), that is, the Gregorian calendar era, is now the most international countries adopted the annual standard, originally originated in Europe and other Western Christian countries, to Jesus was born for the beginning of the year, formerly known as the West, modern Scholars in order to dilute the religious color and renamed the AD. As the starting point of the year is AD 1 year, so some scholars believe that the 21st century should begin in 2001. ...