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