/**
  * Checks for an existing date format.
  *
  * @param string|int $entity_id
  *   The entity ID.
  * @param array $element
  *   The form element.
  *
  * @return bool
  *   TRUE if this format already exists, FALSE otherwise.
  */
 public function exists($entity_id, array $element)
 {
     return (bool) $this->dateFormatStorage->getQuery()->condition('id', $element['#field_prefix'] . $entity_id)->execute();
 }