Invoice date can be edited on Leases page.
First, click on Leases icon on the left sidebar menu.
Now you are in lease, On the top of lease page there you could see Edit button.
Under the Move-In Information section click on Move In Date field and pick the date from the calendar.
At the bottom you could see the Update Changes button just click on that for save the changes.
Note: 1. You cannot able to edit the move-in date for the merged Invoices.
Note: 2. While editing the back dated move-in date make sure the unit is vacant on that date.
Note: 3. You cannot edit the move-in date for the moved out lease.