This date prints on the checks and direct deposit forms created in the next pay run. When you do an inquiry on checks that were written, this date is attached to the checks on the system. You can do this using the Pay Inquiry window.
At the time of the next pay run, if the HR Group Control does not have Check Date, the system uses the Check Date specified on the Payroll Control table. In the Update Payroll process, the Check Date is used to determine the month, quarter, and year to which the amounts will be added.