Alex Rivera | Logout

Comparing two NSDates and ignoring the time component

Asked 2009-12-06T09:36:35.273
73

What is the most efficient/recommended way of comparing two NSDates? I would like to be able to see if both dates are on the same day, irrespective of the time and have started writing some code that uses the timeIntervalSinceDate: method within the NSDate class and gets the integer of this value divided by the number of seconds in a day. This seems long winded and I feel like I am missing something obvious.

The code I am trying to fix is:

if (!([key compare:todaysDate] == NSOrderedDescending))
{
    todaysDateSection = [eventSectionsArray count] - 1;
}

where key and todaysDate are NSDate objects and todaysDate is creating using:

NSDate *todaysDate = [[NSDate alloc] init];

Regards

Dave

iphone objective-c nsdate
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1 Answer

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The documentation regarding NSDate indicates that the compare: and isEqual: methods will both perform a basic comparison and order the results, albeit they still factor in time.

Probably the simplest way to manage the task would be to create a new isToday method to the effect of the following:

- (bool)isToday:(NSDate *)otherDate
{
    currentTime = [however current time is retrieved]; // Pardon the bit of pseudo-code

    if (currentTime < [otherDate timeIntervalSinceNow])
    {
        return YES;
    }
    else
    {
        return NO;
    }
}
answered 2009-12-06T09:58:16.587

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