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Time has always been calculated in an ascending order. The ancient civilizations i.e. the Greeks counted the time in Olympiads [4years period] ever since Olympic Games were introduced. At the dawn of the 5th century AD/ CE when Christianity was established as the official state religion of the Roman Empire a new method was introduced separating the ancient world before the Jesus Christ’s birth naming it as BC or BCE Before Common Era and the period after the Jesus Christ’s birth naming it as AD Anno Domini or Common Era or CE.

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16y ago
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16y ago

BC

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Q: Which came first BC or AD?
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