Date format in Receipts

Hello: My boss wants to add the Due Date on each receipt that uses Account as tender. I created the variable on XML code using:

Transaction.Date + 20

And print it with:

(Tender.Descriptor.TenderType = tenderAccount) "Due Date|" DueDate

This works, but the DueDate is printed as a number. How can I change its format to MM/DD/YYYY. I tried using all VB Date function, but no one worked.

Please, help me.