Is there a way to correct the date on a reconciliation of credit card once it is completed?

Hi office298,

Welcome to the community. Being able to reconcile your accounts is essential to ensure that your transactions are correctly recorded in your books. QuickBooks Online is a great program that gives you the ability to simply track your sales and expenses. I'd be glad to help. 

Once an account is reconciled, the date can't be changed. You'd need to undo the reconciliation to correct the date. I encourage you to contact an accountant if you'd like to undo the reconciliation to correct the date. If you don't have an accountant, you can find one near you by clicking on My Accountant on the left navigation menu> and then Find a pro to help.

Let me know if you have questions, I'll be happy to help.