Converting string MM/DD/YYYY to NSDate

In my app i'm using Facebook Graph API and when I'm fetching user details i get the user's birthday as a string with format MM/DD/YYYY.

My question is, how can I convert string "MM/DD/YYYY" to NSDate?

I try doing

 NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
 [dateFormatter setDateFormat:@"MM/DD/YYYY"];
 NSDate *date = [dateFormatter dateFromString:@"08/08/2012"];
 [dateFormatter release];  

But I got the wrong date