excerpt from a uilabel subclass that counts down to a date

CountdownLabel.M

- (void)update
{
  // check interval and update text
	if ( _running ) {

		// do the update
		NSTimeInterval tmpInterval = [self.date timeIntervalSinceNow];

		int tmpMins = tmpInterval/60;
		int tmpSecs = tmpInterval-(tmpMins*60);

		if ( tmpMins < 0 ) {
			tmpMins = 0;
		}
		
		if ( tmpSecs < 0 ) {
			tmpSecs = 0;
		}
		
		NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
		[formatter setMinimumIntegerDigits:2];
		[formatter setMaximumFractionDigits:0];
		
		[self setText:[NSString stringWithFormat:@"%d:%@",tmpMins,[formatter stringFromNumber:[NSNumber numberWithInt:tmpSecs]]]];

		[formatter release];

		if ( tmpInterval > 0 ) {
			[self performSelector:@selector(update) withObject:nil afterDelay:1.0];
		} else {
			_running = NO;
			_isExpired = YES;
			// completion block
			if ( self.completionBlock ) {
				_completionBlock();
			}
		}
	
	}
}

ugh init'ing and releasing the number formatter, past me was really inefficient.