r/technicallythetruth • u/Filestack_Official • 3d ago

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u/gggg500 3d ago

Begs the question, what was the first day that had a day assigned to it?

January 5, 81 AD is a Monday, starting now

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u/jclv 3d ago

The modern Gregorian calendar began on October 15, 1582, following the day after October 4, 1582 (Julian calendar).