Difference between 2 UIDatePicker’s in hours

UIDatePicker *date1;
UIDatePicker *date2;

The function to show difference between these two date pickers


NSDate *date1Val = date1.date;
NSDate *date2Val = date2.date;
NSTimeInterval interval = [date2Val timeIntervalSinceDate:date1Val];
int hours = (int)interval / 3600;
int minutes = (interval - (hours*3600)) / 60;
NSString *timeDiff = [NSString stringWithFormat:@"%d:%d", hours, minutes];