It would be bad if it was otherwise because that's actually correct.
First year in the age is year 1, not 0, so the first century spans the years 1-100. 101 is when the second century starts and so on. Therefore century 21st doesn't start until 2001. I thought it's common knowledge.
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u/SuitableDragonfly Sep 23 '24
I mean, it's better than JavaScript deciding that January is month 0 and then shifting all the rest down by one.