- 🇳🇿New Zealand quietone New Zealand
I tested this on Drupal 10.1.x, standard install. I followed the steps in the Issue Summary, although I used Italian instead of German. At step 11, the date formats were not switched back to m/d/y. I modified the medium date pattern and it was correctly shown on the content that I had created in step 6. I then set the site default language to English and the date time format were not changed, that is they were still d/m/y. Assuming I have followed the step correctly, this appears to have been fixed.
Therefore, I am closing this as outdated. Reopen and add a comment if there is still a problem.