Shipping date for Net 30

We create an invoice for our customer as soon as their purchase order is received.  Most of our customers are either Net 30 or Net 45.  The problem we run into is that Quickbooks derives the due date from the invoice date. Thus payment for an order on 7.1.2020 would be due 7.31.2020.  However due to the nature of our business the order can take awhile to ship out, especially freight orders. So if we get an order on 7.1.2020 it may not ship until 7.15.2020, and the customer is supposed to have 30 days from when the item ships, not when we create the invoice.  So the 7.1.2020 order that shipped the 15th is actually do 8.15.2020.  Is there any way to configure Quickbooks to derive the due date from the shipping date, not the invoice date? Right now we have a ton on "overdue" invoices but the majority are customers that are well within their payment time. 

(some of you may say to change the invoice date to the ship date but this cant be done as our inventory software system uses the customer PO date as the invoice date and Quickbooks must match the accounting system so our accounting system works. )