Hello there, @walton123.
It's my pleasure to provide information about your concern about changing the date of the reconciled bill in QuickBooks Online (QBO).
In this case, it will not be a problem if you change the bill date even if it's reconciled. It will only affect the financial report, specifically in the expenses area. It can only be a problem on the reconciliation side if you change the date of the bill payments.
I'm leaving you these articles to learn more about bills, reconciling, and related errors in QuickBooks:
Keep me posted in the comment below if you have clarifications or additional QuickBooks concerns. I'm always here to assist you.
