Hi there, Hodge. To have the correct date on your T4s, you need to delete the archived T4s and re-create a new one. Let me provide you with the steps.

Before we proceed to the steps, can you tell me what is the specific error you encountered after you put the incorrect date so we can sort this out? In the meantime, you can perform first basic troubleshooting to assess if that error is from browser issues.

Anyway, here's how to delete T4s from the archive:

1. Click Payroll, then select Payroll Tax.
2. Choose Filings.
3. Click Archive.
4. Select the dropdown menu on T4 Employee Slips and choose delete.

Then, this is how to re-create T4s:

1. Navigate to Taxes, then go to Payroll tax.
2. Click Filings.
3. Under Action needed click on Review for T4 Summary to verify that the sum amounts are correct, then click Next to proceed.
4. In the T4 Employer Slips, click Preview to confirm the amounts are accurate,
5. Please download the XML file to submit it to the CRA website. Click Next.
6. In the T4 Employee Slips, click Preview to either save or print the T4 slips to send to employees.
7. Click on Record filing, then in the Send to Workforce, select the employees you like to send the T4s to via Workforce.
8. Click Submit, then Done.

You can have this article for reference with the steps I've provided: How to delete and re-create T4s in QuickBooks Online Payroll.

Once deleting and re-creating T4s to provide the correct date is through, you can use this article to learn how to submit it to the CRA: Submit your employee's T4 slips and T4 Summary to the CRA.

Successfully updating the date on your T4s by deleting the old ones and recreating them can ensure your filings are accurate. The steps are guide to confidently manage your payroll responsibilities. We appreciate your diligence in resolving this matter, feel free to reach out if you need further assistance.