Hi
I recommend first that you update your Xibo to 1.8.13. That would fix a lot of bugs.
Than in Seetings → region: “de” is correct Timezone: GMT +2 (Europe, Berlin) Dateformat: d.m.Y H:i
Detect Language is hooked on Calender: Gregorian
This settings work for me.
Xmr: Howtos: Custom Installation on Win10 with Xampp in German - #5 by SteitzTo