Forum Post: RE: How do I define a Nullable DateTime variable in Visual COBOL ?

The System.Nullable generic should do what you want. You can use that in COBOL with code such as:-        program-id. Program1 as "Nullable.Program1".        data division.        working-storage section.        01  ws-datetime     type System.Nullable[type System.DateTime].        procedure division.                   set ws-datetime to new type System.Nullable[type System.DateTime]            display ws-datetime::HasValue            if ws-datetime::HasValue                display "DateTime has Value."            else                display "DateTime is NULL."            end-if                          set ws-datetime to type System.DateTime::Now            display ws-datetime::HasValue            if ws-datetime::HasValue                display "DateTime has Value."            else                display "DateTime is NULL."            end-if                          goback.                   end program Program1. The HasValue property indicates if the type variable is null.