public function setNoWorkingDays(array $days, $format = null)
    {
        $this->noWorkingDays = $days;
        if ($format) {
            $this->formatNoWorkingDays = $format;
        }
        return $this;
    }
public function setNoWorkingDays(array $days, $format = null)
    {
        $this->noWorkingDays = $days;
        if ($format) {
            $this->formatNoWorkingDays = $format;
        }
        return $this;
    }
public function setNoWorkingDays ( array $ days , $ format = null ) { $ this -> noWorkingDays = $ days ; if ( $ format ) { $ this -> formatNoWorkingDays = $ format ; } return $ this ; }
Set official no working days for your country.

Format:
['j-m', 'j-m', ...]

@param $days
@param $format
@return $this
Set official no working days for your country .