In the past we were able to make RadGrid DateTime columns display the correct date region formatting by only adding Culture="auto" to the page. This still works for all our supported browsers and OSs, except IE11 on Windows 10. On this combination, it is always displaying in US format. We are able to make Firefox work on Windows 10 by installing the desired region. We can also make IE11 work on Windows 7 and 8.1 by changing our region settings. Its just the specific combination of IE on Windows 10. We are currently using telerik version 2015.2.623.35, but were also able to reproduce the issue when upgrading to the latest version. Is there something else we have to add to make this work on IE11 Win10?