Question

I am trying to compare two dates but I can t see how it works at all …

this is the code that I am using :

   NSCalendar* myCalendar = [NSCalendar currentCalendar];
    NSDateComponents* components = [myCalendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit 

                                                 fromDate:[NSDate date]];
    [components setYear:2012];
    [components setMonth:03];
    [components setDay:25];
    NSDate *startDate = [myCalendar dateFromComponents:components];


    NSDateComponents* components2 = [myCalendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit 

                                                 fromDate:[NSDate date]];
    [components2 setYear:2012];
    [components2 setMonth:04];
    [components2 setDay:25];
    NSDate *endDate = [myCalendar dateFromComponents:components];

    NSComparisonResult result1 = [now compare:startDate];
    NSComparisonResult result2 = [now compare:endDate];

    if (result2 &&

        result1
        ) {
        int x =1;
    }

the thing is even if the two dates are in the future , i still can get into the if condition … any reason ?

Answer 1

The values of result1 and result2 are one of the following.

enum {
    NSOrderedAscending = -1,
    NSOrderedSame,
    NSOrderedDescending
};
typedef NSInteger NSComparisonResult;

The only time (result2 && result1) wouldn’t return true is when one of them evaluates to false or 0. This only happens if one of the dates is exactly the same as now.

if (result1 == NSOrderedAscending) {
    // result1 is in the future
}

if (result1 == NSOrderedDescending) {
    // result1 is in the past
}