The Diseased Toe said:
So why did we celebrate the millennia at 2000? Why not 2001?
Was that also not the start of a new decade?
Now, completely contradicting what I have said, a decade is technically any 10-year period. So it could be starting from 1876.
A Calendar decade starts when the year ends with the number 1.
It makes more sense to end on a 0
And this talk about ignorance.
Arrogance is also a factor...
You're right about decades beginning at any year, it's just a unit really, but if you were to treat a decade the same way you would treat a century as in, "the 21st century" started at a specific time - that time being the 1st of January 2001 - then this decade should have started yesterday. Because there was no such thing as a "Year 0" the beginning of every century, millennium and decade is the first year in that region ending with a "1".
We celebrated 2000 as the new millennium because it was cool to be in "The 2000s", but 2001 was the beginning of that millennium, we were just wrong.
Edit: Sorry for taking stuff so off topic everyone!