Before the BC/AD system was created, how did ancient civilizations track the passage of years? And if not, why? | AskHistorians Archive Observer

Before the BC/AD system was created, how did ancient civilizations track the passage of years? And if not, why?

by Mesoda

Bonus: Around what time was the BC/AD system adopted by, let's say, Europe?

Mictlantecuhtli

There's always room for discussion, but perhaps the section Calendars from our FAQ will answer your inquiry.