Sum column if date (year) is greater than 09

Hello,
Hi I'm trying to calculate 2 column if the date is greater than 2009

in Column A Column B Column C
5/31/2009 75 35
6/30/2009 40 20
12/2/2010 20 10


I need to take Column B minus Column C if the date is less than 2009. Can some please provide me the right formula to use?

Thank you very much for your help

Best,
Joan