OWB is expected to take the date formatting from Windows. With the major languages English, German, and French there are hickups. With minor languages it should come straight from Windows.
That is OWB reads the Regional settings when it is launched.
Up to Win 7 it was easy to put a link to Regional settings on the desktop and set it to give the desired format before OWB was launched and back to normal after it was launched.
Much easier than to do it the registry.
I have not tried that in Windows 10.