...
The library due date appears only on the staff side, at in the top Additional Service Details of the Audit screen of the request. The local due date is visible both for staff and for patrons in RACER. On the staff side the local due date is in the audit details of the Received action. The patron in ZPortal sees the local due date in the Date Due field of the request when s/he checks My Requests. The local due date also appears in on the Received Book Band.
Here is an example of a request where the lending library indicated a due date of June 7 and the borrowing library entered a Local Due Date of May 31:
In VDX (staff side): 
In ZPortal (patron side) and on bookband: 
