You premise is wrong already: decades start at xxx0 for the same people for whom centuries start at xx00. And vice versa. And then there's people like me who just cringe inside and secretly like to celebrate the new decade/century twice in a row 
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Centuries only start at xx01 for those who speak languages where "19th Century" is a common thing to say. For us who speak languages where we always say the equivalent to "the eighteen hundreds" the xx01 concept seems very strange.
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It does not matter if the first decade started on year 1. The fact is that the 2020s start in 2020 and the 2010s is over and that is why people care more about this year. It is the end of the 2010s, which is still a decade (ie ten years)
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By this definition (i.e. any span of 10 years) every year marks the end of a decade.
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Maybe they were using a 74LS90?
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as best i can tell, people are generally getting stupider as time goes on, so nothing surprises me anymore.
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Centuries start at xx00. Except the first one: I think those people should be marked out as special for creating a new calendar with an array that starts at 1.
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No, they don't. :) They should of course, but they don't. But I'm all for changing that definition. Let's also switch to the holocene calendar if we're already at it. (Yes, I am dead serious about that.) I wish you a happy year 12020 and a great 1203rd decade!
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I have no idea but I'm gonna blame catholics on principle...
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Always a safe bet..
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