Calculate Dates in Objective-C

calculate-dates-obj-c

- (void) calculateDates {
    NSDate *todayDate = [[NSDate alloc] init];
    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *tomorrowOffset = [[NSDateComponents alloc] init];
    [tomorrowOffset setDay:1];
    NSDateComponents *yesterdayOffset = [[NSDateComponents alloc] init];
    [yesterdayOffset setDay:-1];
    
    NSDate *tomorrowDate = [gregorian dateByAddingComponents:tomorrowOffset toDate:todayDate options:0];
    NSDate *yesterdayDate = [gregorian dateByAddingComponents:yesterdayOffset toDate:todayDate options:0];
    
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"MM-dd-yyyy"];
    
    NSString *yesterday = [dateFormatter stringFromDate: yesterdayDate];
    NSString *today = [dateFormatter stringFromDate: todayDate];
    NSString *tomorrow = [dateFormatter stringFromDate: tomorrowDate];
}