Increment/Decreament NSDate

Increament:

NSString *date =@”12-12-2012″;  
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@”MM-dd-yyyy”];        
    NSDate *dateFromString = [dateFormatter dateFromString:date];
    int daysToAdd = 1;
    NSDate *newDate1 = [dateFromString addTimeInterval:60*60*24*daysToAdd];
    NSDateFormatter    *dateFormat = [[NSDateFormatter alloc]init];
    [dateFormat setDateFormat:@”MM-dd-YYYY”];
    NSString *Finaldate = [dateFormat stringFromDate:newDate1];

 

Decrement :

NSString *date =@”12-12-2012″;  
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@”MM-dd-yyyy”];        
    NSDate *dateFromString = [dateFormatter dateFromString:date];
    int daysToAdd = 1;
  NSDate *newDate1 = [dateFromString addTimeInterval:-(24*60*60)];
    NSDateFormatter    *dateFormat = [[NSDateFormatter alloc]init];
    [dateFormat setDateFormat:@”MM-dd-YYYY”];
    NSString *Finaldate = [dateFormat stringFromDate:newDate1];