a specification of a point in absolute calendar time, at the resolution of one day.
(Inherited-Facet-Value Slot-Value-Type Conference Conf.Date Calendar-Date) (=> (Conference ?X) (And (Value-Cardinality ?X Conf.Name 1) (Value-Type ?X Conf.Name Biblio-Name) (Value-Cardinality ?X Conf.Organization 1) (Value-Type ?X Conf.Organization Organization) (Value-Cardinality ?X Conf.Date 1) (Value-Type ?X Conf.Date Calendar-Date) (Value-Type ?X Conf.Address City-Address) (Maximum-Value-Cardinality ?X Conf.Address 1))) (=> (Conf.Date $X $Y) (Calendar-Date $Y))