I can guide you how to change your reconciliation date. You’ll want to click the Edit info in the reconciliation page to change the date. Let me walk you through the steps in your QuickBooks Online (QBO) account.
If you haven’t completed the reconciliation, you can still change the ending date. Here’s how:
Go to the Accounting menu.
Select the Reconcile tab.
Choose the bank account from the Account drop-down menu.
Click the Resume reconciling button.
Then click the Edit Info button located in the upper right-hand corner.
Change the Ending Balance and Ending Date.
If you’re already done with the reconciliation, you’ll want to leave the date as it is. Changing the date of a reconciled account is not possible in QBO. Or, you can undo the reconciliation and correct the date.