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• If the calendar had started from day one, you would not have said "today is 22 December 0000". It would be 22 December 0001. There cannot be a year zero when you count, so the first decade would have begun on 1 January 0001 and ended on …

  in Does a decade begin w/ 0 or 1? Comment by alexander-kelly_60b68784dfd3e June 2021