The question is not quite clear, but one apparent part of it is: .NET
System.DateTime
type is not nullable, because this is a structure, a value type. How to express the null time then?
The answer is: you can use nullable type you can produce out of the (non-nullable) value type
System.DateTime
:
System.DateTime structureValue =
System.DateTime? nullableTime = null;
Please see:
http://msdn.microsoft.com/en-us/library/1t3y8s4s.aspx[
^].
—SA