This used to work fine on Windows 8.1 and .Net FX 4.5.2 (VS2013):
var dt = DateTime.Parse("24.12.2012", new CultureInfo("nb-NO"));
This is a perfectly valid Norwegian culture date format, meaning the 24th of Dec 2012.
Using Windows 10 Enterprise US English Edition and VS 2015 this works building as a .Net 2.0 project, but fails with any .Net 4.0-4.6 project.
This doesn't work either, for the record:
var culture = new CultureInfo("nb-NO");
string s = new DateTime(2012, 12, 24).ToString(culture);