Hi Pakking, it's great to have you here in the Community!
You can create a paycheck with a past check date as long as it's not a direct deposit and it's not after the tax period due date for paying taxes or filing forms for that period.
If you receive a message to choose a more recent pay date while creating a paycheck, you can contact us for assistance.
For more detailed information, visit this article: Create a late (backdated) paycheck in QuickBooks Payroll.
In case you want to enter your employee's year-to-date paycheck info and company totals, you can check out this article for guidance: Add pay history to QuickBooks Online Payroll.
Let me know if you need further assistance processing payroll with a backdated pay date. I'm always available to help.
