Alright, I've heard many people say that the 21st century started on 1/1/01 instead of 1/1/00 as most people beleve. If this is true then wouldn't ever year go up by one. 2001-2010, 2011-2021, which would be a decade. Am I right? But whatever; I remember having a blast as a 10 year old celebrating the begining of the 21st century 1/1/00, and whatever the facts are 1/1/00 will be the begining of the 21st century in my head (and in many other American'), just because of membories sake.

Calendars in the old days tended to be inaccurate (the "modern" one didn't even come into use until George Washington's life in the 18th Century), so this could really be 1900 or 2100 for all we know. ;D

But, to me, I'd still say it was Y2K.

Of course, if you're talking about a cultural sense, most decades tend to start around the second year (the "1"), but that's another story.

The 21st Century did actually start on 1/1/2001, because there was no Year Zero (no 1/1/0000). Therefore, the 1st Century started on 1/1/001 and finished on 31/12/100 (not 31/12/99). But the whole point is really moot, because the modern calendar we use now wasn't even invented until the 16th Century. Before that, people used the Julian Calendar, and even that didn't start counting the Christian Era (ie, AD) until the fourth century. SO technically, 2001 was the first year of the 21st Century, but popularly, it was 2000.

BTW, because of the same reason, decades are technically counted from the 0001 year to the 0010 year too. ie. the 90s started in 1991 (not 1990) and ended in 2000 (not 1999), so you were right about that. :)