On my Android-5.x smartphone, in Date-Time settings, there was the option to "Choose Date Format"
Unfortunatly in Android-7.x and Android-8.x devices this possibility seems to be gone.

Has this moved to another place (where I didn't find it) ?
How can I change the Date-format ?
Is there an App to configure the Date-format ?

Even with all the same settings for Language a.s.o I can't find a way to have the same Date format, which is very annoying !