code: public function setTimeZone($timezone)
      {
          if(!$timezone) {
              return $this;
          }
          try {
              Carbon::now($timezone);
          } catch (\Exception $e) {
              $this->invalidArguments('10004', sprintf('Invalid timezone set "%s"', $timezone));
          }
          return $this->setParameter('timezone', $timezone);
      }
docs: Set the address time zone
  @param string|null $timezone
  @return $this