NSDate *now = [NSDate date];
int daysToAdd = 50;  // or 60 :-)
NSDate *newDate1 = [now addTimeInterval:60*60*24*daysToAdd];
NSLog(@"Quick: %@", newDate1);

http://www.drobnik.com/touch/2009/05/adding-days-to-nsdate/

Add days to a NSDate

date, iphone

Objective C