The explicit date when the command specified in this conceptual
row in the 'xcmHrDevCalendarTable' SHALL be invoked.
Usage: When 'xcmHrDevCalendarExplicitDate' is used, the value
of 'xcmHrDevCalendarDayOfWeek' SHALL be 'everyDay' and the value
of 'xcmHrDevCalendarTimeOfDay' SHALL be arbitrary (to provide
uniqueness for this conceptual row).