How can I compare two dates, return a number of days

Question

how can I compare two dates return number of days. Ex: Missing X days of the Cup. look my code.

  NSDateFormatter *df = [[NSDateFormatter alloc]init];  
  [d         


        

Answer 1

Need to call this method and set 2 dates only which we want to calculate differently.

-(void) calculateSleepHours:(NSDate *)sleepDate :(NSDate *)wakeStr 
{

   if (sleepDate !=nil && wakeStr!=nil) {`enter code here`

    NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc] init];
    [dateFormatter1 setDateFormat:@"yyyy-MM-dd HH:mm:ssZ"];
    NSDate *date1 = [ApplicationManager getInstance].sleepTime;;

    NSDate *date2 = [ApplicationManager getInstance].wakeupTime;

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

    NSUInteger unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit;

    NSDateComponents *components = [gregorian components:unitFlags
                                                fromDate:date1
                                                  toDate:date2 options:0];

    NSInteger months = [components month];
    NSInteger days = [components day];
    NSInteger hours = [components hour];
    NSInteger minute=[components minute];
    NSInteger second=[components second];
    DLog(@"Month %ld day %ld hour is %ld min %ld sec %ld  ",(long)months,(long)days,(long)hours,(long)minute,(long)second);

    sleepHours.text=[NSString stringWithFormat:@"Hour %ld Min %ld Sec %ld",(long)hours,(long)minute,(long)second];
    }
}