Can i change at statement date after reconciliation ? I put the wrong date now its screwing up my next month

Good to see you here in the QuickBooks Community, @tsgrmd.

I'm here to help share some information about reconciling accounts in QuickBooks Online (QBO). 

You have an option to edit the statement ending date before an account is reconciled. To do this, here's how:

1. On the left menu tab, click Accounting.
2. Select on Reconcile tab.
3. Click the Edit info button at the top of the reconciliation page.
4. Change the Ending date.
5. Click Save.

However, if you've completed your reconciliation, there isn't a way to change it. The options you can do:

• You can leave the date and just make sure to select the correct end date the next time you reconcile (an incorrect date doesn't affect any balances and will not prevent you from future reconciliation).
• Un-reconcile and then re-reconcile with the correct end date.

For additional reference, you can check these articles:

• How to unreconcile a transaction or undo a reconciliation.
• How to reconcile accounts.

Please know that I'm just a post away if you have any other questions about the reconciliation. Wishing you and your business continued success!