Unexpected 'is' operator result

Testing for the DateTimeOffSet using the 'is' operator never passes. In the following sample I know the DateTimeOffset type is one of the properties but it never returns True. Thanks for helping me understand why?

foreach (var prop in qSOs.GetListType().GetProperties()){    Console.WriteLine(prop.PropertyType); // System.DateTimeOffset    if (prop.PropertyType is System.DateTimeOffset) // Never returns True    {        var p = prop.Name;    }}