RadDatePicker/RadDateTimePicker can not set different date than the current one in Win10 (IE11 and Edge) when Finnish and Norwegian culture is used.
Microsoft changed the Time separator for these cultures, it breaks not only our JavaScript parsing but the .NET parsing as well.
https://connect.microsoft.com/VisualStudio/Feedback/Details/1621722
The issue is fixed for Q3 2015 SP1. Internally we change the TimeSeparator used by the DateInput to ":" for cultures where it is the same as the DateSeparator. It will not affect the DateFormatString.