class DateFormatEditForm

class DateFormatEditForm extends DateFormatFormBase {
  use StringTranslationTrait;
  
  /**
   * Constructs a DateFormatEditForm object.
   *
   * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
   *   The date service.
   * @param \Drupal\Core\Config\Entity\ConfigEntityStorageInterface $date_format_storage
   *   The date format storage.
   * @param \Drupal\Component\Datetime\TimeInterface $time
   *   The time service.
   */
  public function __construct(DateFormatterInterface $date_formatter, ConfigEntityStorageInterface $date_format_storage, protected TimeInterface $time) {
    parent::__construct($date_formatter, $date_format_storage);
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container->get('date.formatter'), $container->get('entity_type.manager')
      ->getStorage('date_format'), $container->get('datetime.time'));
  }
  
  /**
   * {@inheritdoc}
   */
  public function form(array $form, FormStateInterface $form_state) {
    $form = parent::form($form, $form_state);
    $now = $this->t('Displayed as %date', [
      '%date' => $this->dateFormatter
        ->format($this->time
        ->getRequestTime(), $this->entity
        ->id()),
    ]);
    $form['date_format_pattern']['#field_suffix'] = ' <small data-drupal-date-formatter="preview">' . $now . '</small>';
    $form['date_format_pattern']['#default_value'] = $this->entity
      ->getPattern();
    return $form;
  }
  
  /**
   * {@inheritdoc}
   */
  protected function actions(array $form, FormStateInterface $form_state) {
    $actions = parent::actions($form, $form_state);
    $actions['submit']['#value'] = $this->t('Save format');
    unset($actions['delete']);
    return $actions;
  }

}