The error in the output of the date of voting activity

In the voting list, I did not see the date.

I looked at the code and saw the link to the short date format.
I changed the date format before this, according to the technical requirements of the site.

      $date = \Drupal::service('date.formatter')->format($entity->getCreated() + $entity->getRuntime(), 'short');
      $output = 'Yes (until ' . rtrim(strstr($date, '-', true)) . ')';

Most likely, you need to provide another way, or to search for a substring, use not "-" but space " "