I need to change ending date on bank reconciliation. Put in wrong ending date by error

Welcome to the Community, @Dianne Metts.

You can go back to the Reconciliation page and edit previously entered information, such as the ending date from there. Let me guide you through the process.

1. Click the Gear icon, then select Reconcile.
2. Select the appropriate account.
3. Hit Resume reconciling.
4. Press the Edit info option in the upper-right of your screen.
5. Change the ending date to the correct one.
6. Click Save.

Here's an article you can read for more details: Fix issues when you're reconciling in QuickBooks Online.

To learn more about the reconcile workflow, feel free to check out this article for more information: Learn the reconcile workflow in QuickBooks.

Please let me know if you need clarification about this, or there's anything else I can do for you. I'll be standing by for your response. Have a great day and keep safe.