Common Era

Common Era is a year-numbering system in which years are counted from the same epoch as Anno Domini, with no year zero. Its dates use CE and BCE instead of AD and BC.

Anno Domini: Anno Domini is a year-numbering convention that counts years from the traditional date of Jesus Christ’s birth. It uses the same year numbers and epoch, but explicitly Christian labels.
Dionysius Exiguus: Dionysius Exiguus was a sixth-century monk who helped establish the Anno Domini year-numbering system. His chronology supplied the epoch later shared by CE dating.
Hijri calendar: The Hijri calendar is an Islamic lunar calendar that counts years from the migration of Muhammad and his followers to Medina. It uses a distinct religious epoch rather than the CE numbering origin.
Historical chronology: Historical chronology arranges past events in time and establishes their dates and sequence. CE and BCE provide a common year framework for dating events across regions.
Before Christ: Before Christ is a year label for dates counted backward from the traditional birth year of Jesus Christ. BC is the traditional counterpart to BCE for years before the era boundary.
Bede: Bede was an English monk and historian whose eighth-century writings helped spread Anno Domini dating. His influential histories helped normalize the year numbering behind Common Era.
Hebrew calendar: The Hebrew calendar is a lunisolar calendar used in Jewish religious life, with years traditionally numbered from creation. Its year numbering reflects a different epoch and calendar structure.
Academic style guide: An academic style guide sets conventions for writing, citation, formatting, and terminology in scholarly work. Style guides often specify when to use CE and BCE rather than AD and BC.
Before Common Era: Before Common Era is a year label for dates before the Common Era boundary, using the same numbering as BC. BCE completes the paired notation used with CE.
Anno Mundi: Anno Mundi is a family of chronologies that number years from a calculated date of creation. It represents a different religiously grounded epoch from the one Common Era retains.

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