DateLib::getNearestWorkTime

private function getNearestWorkTime($date, $multiplier = 1)
{
	$reverse = $multiplier < 0;
	[$startSeconds, $endSeconds] = $this->getCalendarWorkTime();
	$dayTimeStamp = $this->getWorkDayTimestamp($date);

	if ($this->isHoliday($date))
	{
		$date -= $dayTimeStamp;
		$date += $reverse ? -86400 + $endSeconds : $startSeconds;
		$dayTimeStamp = $reverse ? $endSeconds : $startSeconds;
	}

	if (!$this->isWorkTime($date))
	{
		$date -= $dayTimeStamp;

		if ($dayTimeStamp < $startSeconds)
		{
			$date += $reverse ? -86400 + $endSeconds : $startSeconds;
		}
		else
		{
			$date += $reverse ? $endSeconds : 86400 + $startSeconds;
		}
	}

	if ($this->isHoliday($date))
	{
		$date = $this->addWorkDay($date, $reverse ? -1 : 1);
	}

	return $date;
}