NC13 + CODE: Date in German 31.3.2018 is written like 3/31/2018 - how can I fix this?

Hi all,

when I open an Excel-Sheet created with MS-Office with dates inside, the dates are written U.S.-Format.

31.3.2018 e. g. is written as 3/31/2018

I think this also happens with other NC-Versions, but I cannot check.
Can you tell me where to fix that? It’s very annoying for me.

Thanks a lot,