If I lived in the year 10 AD, how do I know it is the year 10 AD? Were the calendar and the definitions of BC and AD defined back then? | AskHistorians Archive Observer

If I lived in the year 10 AD, how do I know it is the year 10 AD? Were the calendar and the definitions of BC and AD defined back then?

by snappysister

jschooltiger

Always more that can be said, but we have a pretty extensive section on calendars in our FAQ.