public function equals(DateInterval $interval)
	{
		$years   = $this->y == $interval->y;
		$months  = $this->m == $interval->m;
		$days    = $this->d == $interval->d;
		$hours   = $this->h == $interval->h;
		$minutes = $this->i == $interval->i;
		$seconds = $this->s == $interval->s;
		$invert  = $this->invert == $interval->invert;

		return $years && $months && $days && $hours && $minutes && $seconds && $invert;
	}