The AD/CE system we use to date the year was introduced more or less by accident during the Middle Ages. Before its invention, the classical world used a wide range of dating systems.
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Chapters:
0:00 Introduction
0:51 Ancient Greek Calendars
1:42 Counting by Olympiads
2:22 The Seleucid Era
2:56 Consular Dating
3:26 Ab Urbe Condita
4:28 Indictions
4:56 Christian Chronology
5:40 Anno Domini
7:00 Conclusion