Well, the decade that began 1/1/2001 ends 12/31/2010. But the decade that began 1/1/2000 ends 12/31/2009.
Nobody counted from the year zero in the year zero anyway. Or the year one, or any of quite a number of later years. This is all a big retcon, and the question of which decade was what back then is irrelevant.
It's much more clear to have "the 1960s" be the years 1960-1969. Makes for easier pattern-match expressions, too.
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Well, the decade that began 1/1/2001 ends 12/31/2010. But the decade that began 1/1/2000 ends 12/31/2009.
Nobody counted from the year zero in the year zero anyway. Or the year one, or any of quite a number of later years. This is all a big retcon, and the question of which decade was what back then is irrelevant.
It's much more clear to have "the 1960s" be the years 1960-1969. Makes for easier pattern-match expressions, too.