Let me help you with incorrect opening date on your bank account, JoshBeall.
In QuickBooks Online (QBO) we can change the date by undoing the reconciled transactions. Please follow these steps:
To learn more about this one, see the Undo and remove transactions from reconciliations in QuickBooks Online article. Once done, you can now start the reconciliation again and enter the correct opening date. You can check the Reconcile an account in QuickBooks Online article for the steps and details. Just in case QBO doesn't match your bank statement at the end of reconciliation, follow the steps in the Fix issues when you're reconciling accounts in the QuickBooks Online article to troubleshoot the issue.
If the opening balance for one of your accounts is wrong, we can edit it through the View register for the account.
To edit a wrong opening balance:
If there isn't already an opening balance listed and you want to enter one, checkout this article: How to enter an opening balance for an existing account.
Feel free to visit our Banking page for more insights about managing your bank feeds and reconciling accounts.
I'd like to know how you get on after trying the steps, as I want to ensure this is resolved for you. Please reply to this post and I'll get back to you. Take care always.