The license key starts its life time when it is generated.
If you buy before, you "lose" the overlapping days of the licenses (some days of the old and the new at the same time).
didn't quite understand this this was not a support question of any kind im just saying that my key will expire because i bought avast off the i think summer sale when i got 2 years for 1 payment it will expire 2012 and people say 2012 is when the world will "end" actually they also say the world will end may 2011
try to google the world ends and add any year
the world ends 2008 thats there
the world ends 2009 thats there
the world ends 2010 thats there
the world ends 2011 thats there
the world ends 2012 thats there
the world ends 2013 thats there
well you get the point