public function nbd(Carbon $dt = NULL) {

		if (($dt instanceof Carbon) == FALSE) {
			$dt = new Carbon();
		}

		if ($this->deadline()) {
			if ($this->deadline()->lt($dt)) {
				$dt->addDay();
			}
		} else {
			$dt->addDay();
		}

		/* Time becomes irrelevant */
		$dt->setTime(0,0,0);

		$iters = 0;
		
		while ($this->isExcluded($dt)) {
			
			if ($iters == static::$N_MAX_ITER) {
				throw new \RuntimeException('Maximum iterations met for next business day calculation');
			}
			
			$dt->addDay();
			$iters++;
		}

		return $dt;
	}