The "last reconciled" date is incorrect in my register. Can I correct the "last reconciled" date in my register?

Hello there, gutsy4.

Thank you for posting your concern here in the Community. I've got the steps you'll in changing the last reconciled date in QuickBooks Online (QBO).

You can change the date by undoing and then redoing your reconciliation. To minimize the impact of your books, I'll suggest undoing the entries one at a time.

Here's how:

1. Click on the Accounting menu.
2. Choose Chart of Accounts.
3. Find the account holding the transaction, tap the View register.
4. Hit the transaction you want to unreconciled to expand the view.
5. Review the check column. If the transaction is reconciled, you'll see an "R".
6. Tick the checkbox until the box is blank. This removes the transaction from reconciliation.
7. Choose Save.
8. Close the account register.

I also added a link to give more insights about unreconciling transactions. I recommend consulting with your accountant before performing any of the steps. This is to ensure your records are in order. 

I've also added this article adjust small amounts after reconciliation.

Please touch base with us if you have any concerns and questions regarding your reconciliation. As always, we're here to ensure that you'll get the help you need.

This is not my issue. The account was reconciled on “12/31/21” but it says “last reconciled on “1/31/21”. I can’t even find my reconciliation reports after 1/31/21 although I have reconciled every month and have the print out. I know how to remove or adjust one transaction, but thank you for responding.