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Does the first year of a decade count as part of it?

Some just refer to it as transitional year.
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We were discussing this...
I know that the first baby born Jan 1, 2000 was considered having been born in the 21st century. There was even a story about twins born in “two different centuries” because one was born Dec 31, 1999 and the other, Jan 1, 2000.*
Incidentally, I was born Jan 1, 1960, and am considered to be born in the Sixties.

* https://www.cbsnews.com/news/twins-from-different-centuries/
@bijouxbroussard Well that is very interesting. Born only one day apart, but considered to be born in different centuries. I never thought of that.
contrails · 56-60, M
@bijouxbroussard Centuries are a different story... The "first century" is from year 1 (there's no year "0") until year 100 ([i]cent[/i]ury, cent=[i]one hundred[/i]), so the second century goes from the year 101 to 200... etc etc so 2000 is the last year of the 20th century and the 21st century is from the year 2001 onward...

But people don't talk in terms of "the first decade", "second decade" etc. It's the "1970s", the "1860s", etc., so decades include the first number ending in zero (1980 is part of the 1980s), unlike the centuries...

Having said that, no one really cares... 2000 became "the first year of the century" and the "first year of the millennium" (also technically wrong) just because everyone kept saying it without giving much thought...
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