public function setStart(\DateTime $start = null)
    {
        if ($start != null) {
            Validate::isDate($start);
        }
        $this->start = $start;
    }
public function setStart(\DateTime $start = null)
    {
        if ($start != null) {
            Validate::isDate($start);
        }
        $this->start = $start;
    }
public function setStart ( \ DateTime $ start = null ) { if ( $ start != null ) { Validate :: isDate ( $ start ) ; } $ this -> start = $ start ; }
Sets start.

@param \DateTime $start value.

@return void
Sets start .