public function setActivatedOn($activated_on) {
        
        $this -> activated_on = $activated_on !== null ? new \DateTime($activated_on) : null;
        return $this;
    }
public function setActivatedOn($activated_on) {
        
        $this -> activated_on = $activated_on !== null ? new \DateTime($activated_on) : null;
        return $this;
    }
public function setActivatedOn ( $ activated_on ) { $ this -> activated_on = $ activated_on !== null ? new \ DateTime ( $ activated_on ) : null ; return $ this ; }
Sets the activated on
@param string $activated_on
@return TimestampAwareTrait
Sets the activated on