Can I edit date for unprocessed check?

Yes, you can, @grnendeavors-gma.

You'll need to delete the paycheck and create a new one with the correct details. I'd be glad to guide you how in QuickBooks Online (QBO).

Before we begin, please know you can either delete or void your paycheck depending on your processing time and payroll service. When ready, you can follow along with these steps:

1. Go to the Payroll menu and select the Employees tab
2. Under Run Payroll, click the Paycheck list link.
3. Select the check(s) you'd like to delete or void.
   • Delete: This option appears if the direct deposit has not been processed yet or the paycheck is not a direct deposit.
   • Void: This option appears if you indicate that the check has been cashed.
4. Click the I understand that this action cannot be undone checkbox.
5. Then select Delete Paycheck or Void Paycheck to confirm the action.

You can also read this article for more details about this: Delete or void employee paychecks.

Once done, create a new check for your employee and ensure to enter the correct details to avoid any errors. Furthermore, I'm adding these links that you can utilize for future guidance. These contain details on how to file your payroll taxes and let your employees view their paychecks online:

• Invite your employees to QuickBooks Workforce to see pay stubs, W-2s, and more 
• Pay and file payroll taxes online

I'll be right here if you need further assistance with your paychecks and payroll. You can also add in your reply if you have any other QuickBooks-related concerns. Stay safe!