The invoice date is pulled from the date of the appointment on the schedule. If the wrong date is listed on the appointment, the patient was booked into the wrong date on the schedule.
You can reschedule the appointment to update the details: Editing an Appointment Marked as Arrived
Start in the patient’s profile under Patients > Billing > Purchases. Find the product purchase from the list and click View:
Scroll down to the Purchase Details where you can select a new invoice date:
Changes save automatically, so close the window once the new date has been selected.