An employee's workweek is a fixed and regularly recurring period of
168 hours--seven consecutive 24-hour periods. It need not coincide with
the calendar week but may begin on any day and at any hour of the day.
For purposes of computing pay due under the Fair Labor Standards Act, a
single workweek may be established for a plant or other establishment as
a whole or different workweeks may be established for different
employees or groups of employees. Once the beginning time of an
employee's workweek is established, it remains fixed regardless of the
schedule of hours worked by him. The beginning of the workweek may be
changed if the change is intended to be permanent and is not designed to
evade the overtime requirements of the Act. The proper method of
computing overtime pay in a period in which a change in the time of
commencement of the workweek is made, is discussed in Secs. 778.301 and
778.302.
