@astswiss
That’s weird.
I don’t encounter this issue while using the German language pack in the demo.


But the demo is obviously using a different date format. Perhaps you should consider changing yours. Here is what the demo uses:

Agenten-Bereich > Systemeinstellungen
(https://osticket.shop/1.10.4/scp/settings.php?t=system)
I hope this helps.