In recent years there has been debate about when a decade begins and ends. We break it down for you.

Oh, to revel in New Year's Eve. Cheer with good friends! A glass of Champagne

Why is this a controversy?

So that settled it, right?

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Did the debate make it easier to understand when a new decade begins?

So what is the answer?

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So I can still throw an end-of-the-decade party in December, right?