Deny period end date. This can be: * A full date, with non-zero year,
month and day values. * A month and day value, with a zero year. Allows
recurring deny periods each year. Date matching this period will have to be
before the end.
Deny period start date. This can be: * A full date, with non-zero year,
month and day values. * A month and day value, with a zero year. Allows
recurring deny periods each year. Date matching this period will have to be
the same or after the start.