May management direct an employee to work on a Saturday or Sunday if the employee’s normal work schedule is Monday through Friday?
Yes. Changes in an employee’s work schedule are within the discretion of the employing agency, as long as the changes are consistent with law, regulations, and any applicable negotiated agreement. In addition, agencies may require employees to perform overtime work. There is no limit in law or regulations on the amount of overtime work required each day or on weekends. For additional information, see http://www.opm.gov/oca/pay/html/factot.asp