If I hear one more person say that if they hear one more person say that this is the start of a new decade they shall scream, I shall scream.
Yes, I understand basic maths, so I understand that because there was no year 0, technically every decade starts when the year ends in a 1. And here’s the thing: I don’t care. The numbering of our years in tens and hundreds and thousands is entirely arbitrary to begin with, and if we invented it, we get to decide how to use it. Convention and instinct tell us that the change from 2009 to 2010 is more exciting and more worthy of recognition than the change from 2010 to 2011, and they are correct. And if we start our decades with a 1 and end them with a 0, does, say, the year 1930 no longer count as part of the 1930s? Because that way lies crazy, missus.
So when the next person tells you smugly that the new decade doesn’t start for another year, please bop them on the nose and tell them I said it was OK. These people have too much time on their hands. Perhaps we should make decades shorter for their benefit.