As we approach the end of 2009, the print media is giving us “The Decade in Review†features. No doubt as the year’s end approaches, so will radio and TV. These features all assume that the decade started in the year 2000. But the decade (and the century, and the millennium) actually started in 2001. We already had this confusion at the end of the 20th Century over Y2K, and it was clarified at that time. You would think a magazine like Time would get it right, but no! They are just as ignorant as the rest.
Once again, the reason why the decade, century, and millennium begin with the year ending in the number 1 is simply because our calendar started in Year 1. There was no Year 0. We went from Year 1 BC (or BCE) to Year 1 AD (or CE).
When the calendar was invented, there was no concept of zero in the western world; we counted from 1 and the digital count on our fingers ended in 10. In this way, the first decade (our time) ended in 10 AD, the first millennium in 1000 AD, the second in 2000 AD. The new time spans began in 11 AD, 1001 AD and 2001 AD.
So, Time Magazine and others, take note: the first decade ends at the end of 2010 AD, and the next begins January 1st, 2011. Get it right!