January 1, 2001 00:00:00 UTC → December 31, 2100 23:59:59 UTC
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Why 2001–2100? The 21st century officially began on January 1, 2001 (not 2000) because the Gregorian calendar has no "year zero"—it goes directly from 1 BC to 1 AD. Thus each century spans years ending in 01 through 00.
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