Thank you for posting, @mtpropane.

I appreciate your efforts in trying to troubleshoot on your own. And, I realize how it can be time-consuming and inconvenient for you to manually edit the dates of each of your invoices. Let's go through another troubleshooting to see if this will work.

To start, please open a private browsing window by using the keyboard shortcuts specific to your browser:

• Google Chrome: Press Ctrl + Shift + N
• Mozilla Firefox: Press Ctrl + Shift + P
• Microsoft Edge: Press Ctrl + Shift + P
• Safari: Press Command + Shift + N

Opening a private browser ensures that your browsing history is not saved. Open the QuickBooks Online (QBO) page in this window and try to create an invoice again to check if the dates appear correctly. If using the private browsing mode resolves the issue, you can return to your regular browser and clear its cache for a fresh start. If the issue persists in private browsing mode, consider switching to a different supported web browser.

Moreover, if you've done this troubleshooting already, I highly recommend you contact our support team for further assistance. They can securely review your account and conduct a thorough investigation to resolve the issue.

Additionally, you can visit this article for guidance regarding customizing invoices.

Furthermore, this will help you record invoice payment in QuickBooks Online to keep correct financial records.

If you still have questions regarding the dates of your invoices, feel free to comment below. I'd be happy to help you.