code: public function generate($name, array $parameters=array(), $updateTrackerName='global', $referenceType = RouterInterface::ABSOLUTE_PATH, $timestampParameterName=null)
      {
          if (!$timestampParameterName) {
              $timestampParameterName = $this->timestampParameterName;
          }
          $parameters[$timestampParameterName] = $this->updateManager->getLastUpdate($updateTrackerName)->format('U');
  
          return $this->router->generate($name, $parameters, $referenceType);
      }
docs: Generates an URL containining a timestamp parameter
  
  @param  string $name                   The name of the route
  @param  array  $parameters             The parameters of the route
  @param  mixed  $updateTrackerName      The update tracker's name or an array of update trackers
  @param  int    $referenceType          The type of reference to be returned
  @param  string $timestampParameterName The name of the timestamp parameter
  @return string