Time, Calendars, and Seasons


When did the twenty-first century begin

The twenty-first century began at 12:00 A.M. on January 1, 2001. Since the first century, which spanned the years 1 to 100, centuries have been counted beginning with the year ending in “01” rather than “00.” For instance, the twentieth century consists of the years 1901 through 2000.


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