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    <p>i done one count Down timer like this way may be its useful for you </p> <pre><code> -(void) viewWillAppear:(BOOL)animated { timer = [NSTimer scheduledTimerWithTimeInterval: 1.0 target:self selector:@selector(updateCountdown) userInfo:nil repeats: YES]; } </code></pre> <p><strong>AND</strong></p> <pre><code> -(void) updateCountdown { NSString *dateString = @"14-09-2012"; NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"dd-MM-yyyy"]; NSDate *dateFromString = [[NSDate alloc] init]; // voila! dateFromString = [dateFormatter dateFromString:dateString]; NSDate *now = [NSDate date]; NSCalendar *calendar = [NSCalendar currentCalendar]; NSDateComponents *componentsHours = [calendar components:NSHourCalendarUnit fromDate:now]; NSDateComponents *componentMint = [calendar components:NSMinuteCalendarUnit fromDate:now]; NSDateComponents *componentSec = [calendar components:NSSecondCalendarUnit fromDate:now]; NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; NSDateComponents *componentsDaysDiff = [gregorianCalendar components:NSDayCalendarUnit fromDate:now toDate:dateFromString options:0]; lblDaysSetting.text=[NSString stringWithFormat:@"%02d",componentsDaysDiff.day]; lblHouresSetting.text=[NSString stringWithFormat:@"%02d",(24-componentsHours.hour)]; lblMinitSetting.text=[NSString stringWithFormat:@"%02d",(60-componentMint.minute)]; lblSecSetting.text=[NSString stringWithFormat:@"%02d",(60-componentSec.second)]; } </code></pre> <p>now just set your logic </p>
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    1. POSeparate Hours, Mins and Seconds in xcode
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