How to compare date

//-------compare date ------------------------///

    NSDate *today = [NSDate date]; // it will give you current date

    NSDateFormatter *format = [[NSDateFormatter alloc] init];

    [format setDateFormat:@"MM/dd/yyyy"];

    NSDate *todayFormat = [format dateFromString:[format stringFromDate:today]]; // your date

   

    NSComparisonResult result;

    //has three possible values: NSOrderedSame,NSOrderedDescending, NSOrderedAscending

   

    result = [todayFormat compare:historyDate]; // comparing two dates

    NSString *dateString;

   

    if(result==NSOrderedAscending || result==NSOrderedDescending){

        [format setDateFormat:@"EEEE MMM dd yyyy"];

        dateString = [format stringFromDate:historyDate];

    }else{

        dateString  = @"Today";

    }