Watch or counter with NSTimer

take object of NSTimer and also int variable  in .h file like bellow..

    NSTimer *timer;

    int hours, minutes, seconds;

    int secondsLeft;

and just use it with bellow method

- (void)updateCounter:(NSTimer *)theTimer {

    secondsLeft++;

    hours = secondsLeft / 3600;

    minutes = (secondsLeft % 3600) / 60;

    seconds = (secondsLeft %3600) % 60;

    //lblTime.text = [NSString stringWithFormat:@"%02d:%02d:%02d", hours, minutes, seconds];

    NSLog(@"\n%02d:%02d:%02d",hours,minutes,seconds);

}

-(void)countdownTimer{

    

    if([timer isValid])

    {

        [timer release];

    }

    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    timer = [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(updateCounter:) userInfo:nil repeats:YES];

    [pool release];

}

See My Answer also converstion-of-seconds-in-minutes