The decade does start in 2010 not 2011

The decade does start in 2010, not 2011.
Look when people are born they are o then on their first birthday they are 1. Meaning they have had one complete year. The year indicates how many complete years you have not the start of a new year, so the 10th year means 10 years have passed.
December 31st 2009 was the end of the decade when the clock hit 12:00 it means 10 years of a decade had finished. End of story cut this guff about us not ending the decade at the start of 2010. The decade ended in 2010.
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