Thanks for joining this discussion, @rikis981.
Allow me to provide some more details about the date to be used when cleaning up old invoices in QuickBooks Online.
The steps provided by KPI Accounting will help you clean up your old invoices in QuickBooks. To keep your records accurate, you'll need to use the date that the invoices were created.
Also, you may check out this article about reconciling accounts in QuickBooks Online for your future reference.
If you need additional assistance with this process, you may reach out to our Customer Care Team. They have the ability to run a remote-viewing session that can guide you through the steps.
That should do it.
Please feel free to reach back out to me should there be anything else you need. I'd be happy to help. I look forward to hearing from you again.