This read-write bitmap lets an admin select multiple days of the week at once for a recurring (periodic) ACL time range, with each set bit associating the range with a specific weekday; when any bit is set, the separate weekday fields in the periodic start/end times become irrelevant and must be zero. An admin uses this to schedule an ACL to apply on a recurring pattern, such as every weekday, rather than defining a separate rule for each day. For example, setting bits for Monday through Friday in this bitmap schedules the associated periodic ACL to apply every weekday but not on weekends.