Add 90 min to NSDate

Question

what is wrong with this code?

NSDate *matchDateCD = [[object valueForKey:@"matchDate"] description]; // from coredata NSDate
NSDate *add90Min = [matchDateCD dateByAddingTimeInterval:5400];



if ( matchDateCD >=[NSDate date] || add90Min <= matchDateCD )
{

    cell.imageView.image = [UIImage imageNamed: @"r.gif"];//Show image in the table

}    

I need to show this image in the table if the match is running or for 90 min

Answer 1

I don't know what object is that you call valueForKey: on is but presuming it returns an NSDate object, your additional call to description will assign an NSString (the return value of description) to matchDateCD. That is not what you want to do.

This is what you want to do:

NSDate *matchDateCD = [object valueForKey:@"matchDate"];
NSDate *add90Min = [matchDateCD dateByAddingTimeInterval:(90*60)]; // compiler will precompute this to be 5400, but indicating the breakdown is clearer

if ( [matchDateCD earlierDate:[NSDate date]] != matchDateCD ||
     [add90Min laterDate:matchDateCD] == add90Min )
{
    cell.imageView.image = [UIImage imageNamed: @"r.gif"];//Show image in the table
}

Answer 2

Use the dateByAddingTimeInterval method of NSDate to add the number of seconds to the time.

NSDate* newDate = [oldDate dateByAddingTimeInterval:90];

You can then use either NSDateFormatter or NSDateComponents to get the new time back out again.