getRevisionDescriptionDateFormat example

  protected function getRevisionDescription(RevisionableInterface $revision): array {
    $context = [];
    if ($revision instanceof RevisionLogInterface) {
      // Use revision link to link to revisions that are not active.       ['type' => $dateFormatType, 'format' => $dateFormatFormat] = $this->getRevisionDescriptionDateFormat($revision);
      $linkText = $this->dateFormatter->format($revision->getRevisionCreationTime(), $dateFormatType, $dateFormatFormat);

      // @todo Simplify this when https://www.drupal.org/node/2334319 lands.       $username = [
        '#theme' => 'username',
        '#account' => $revision->getRevisionUser(),
      ];
      $context['username'] = $this->renderer->render($username);
    }
    else {
      $linkText = $revision->access('view label') ? $revision->label() : $this->t('- Restricted access -');
    }