Our organization would like to use the ISO date format (known in Windows as yyyy-MM-dd).
I've configured this in our image. When I deploy the image, it replaces the date format with the default for the locale in unattend.xml. As far as I could see in the Unattended Windows Setup Reference for Windows 7, there are no date format settings.
It can be done with a user logon script, or a user GPO, but I really need it to be included in deployment.