As stated in Sec. 778.105, the beginning of the workweek may be
changed for an employee or for a group of employees if the change is
intended to be permanent and is not designed to evade the overtime
requirements of the Act. A change in the workweek necessarily results in
a situation in which one or more hours or days fall in both the ``old''
workweek as previously constituted and the
``new'' workweek. Thus, if the workweek in the plant commenced at 7 a.m.
on Monday and it is now proposed to begin the workweek at 7 a.m. on
Sunday, the hours worked from 7 a.m. Sunday to 7 a.m. Monday will
constitute both the last hours of the old workweek and the first hours
of the newly established workweek.