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peterburkimsher
on April 5, 2020
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Zerah Colburn (mental calculator)
Which 2000-year period? Do you mean from the year 0 to 2000, or 20 to 2020, or 1600 to 3600?
The Gregorian calendar wasn't standardised until 1582.
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The Gregorian calendar wasn't standardised until 1582.