If you have run a payrun with the incorrect date such as Period Start Date, Period End Date or Pay Date, then you will need to rollback and re-do the payrun with the correct dates. There is no ability to change these dates once a payrun has progressed passed the initial Run Payroll screen.
Note: If dates on a current payrun are incorrect and are not corrected this may also impact the Period Start Date and Period End Date of future payruns.