Conditional Split Comparing Date Value

I'm doing a conditional split where I'm checking for changes made to records in a table. One of the fields I'm comparing is a DATE field. I have the conditions figured out for the character and numeric fields, but am stuck on the condition for the DATE fields. Here is the condition I'm using:

(ISNULL(EMP_DATE) ==  TRUE  ?  : EMP_DATE) != (ISNULL(EMP_DATE1) ==  TRUE  ?  : EMP_DATE1)

The condition fails (shows up as red). Could someone provide some insight on this one?

Thank you!