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copied!<p>Hy, try to use this:</p> <p>Put this in <strong><em>-(void)viewDidLoad</em></strong> method</p> <pre><code>NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(countDownTimer) userInfo:nil repeats:YES]; </code></pre> <p>then create the <strong><em>-(void)countDownTimer</em></strong> method</p> <pre><code>- (void)countDownTimer { // my method which returns the differences between two dates in my case double diff = [self getDateDifference]; double days = trunc(diff / (60 * 60 * 24)); double seconds = fmod(diff, 60.0); double minutes = fmod(trunc(diff / 60.0), 60.0); double hours = fmodf(trunc(diff / 3600.0), 24); if(diff > 0) { NSString *countDownString = [NSString stringWithFormat:@"%02.0f day(s)\n%02.0f:%02.0f:%02.0f", days, hours, minutes, seconds]; // IBOutlet label, added in .h self.labelCountDown.text= countDownString; } else { // stoping the timer [timer invalidate]; timer = nil; // do something after countdown ... } } </code></pre> <p>and you can add a <strong><em>- (double)getDateDifference</em></strong> method which returns the difference between two dates in my case</p> <pre><code>- (double)getDateDifference { NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; NSDate *dateFromString = [[NSDate alloc] init]; NSDate *now = [NSDate date]; NSString *myDateString = @"2013-10-10 10:10:10"; // my initial date with time // if you want to use only time, than delete the // date in myDateString and setDateFormat:@"HH:mm:ss" // this line is not required, I used it, because I need GMT+2 [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:+2]]; [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; // get the date dateFromString = [dateFormatter dateFromString:myDateString]; // this line is also not required, I used it because I need GMT+2 // so I added two hours in seconds to 'now' now = [now dateByAddingTimeInterval:60*60*2]; // getting the difference double diff = [dateFromString timeIntervalSinceDate:now]; NSLog(@"dateString: %@", dateString); NSLog(@"now: %@", now); NSLog(@"targetDate: %@", dateFromString); NSLog(@"diff: %f", diff); return diff; } </code></pre> <p>the output is similar to this</p> <pre><code>dateString: 2013-10-10 00:20:00 now: 2013-10-10 00:20:00 +0000 target: 2013-10-10 00:20:28 +0000 diff: 28.382786 </code></pre> <p>I hope it was helpfull</p>

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