Adding days to NSDate

int daysToAdd = 1;

NSDateComponents *components = [[[NSDateComponents alloc] init] autorelease];

[components setDay:daysToAdd];

// create a calendar

NSCalendar *gregorian = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];

NSDate *newDate = [gregorian dateByAddingComponents:components toDate:datePicker.date options:0];