This read-only DisplayString records when collection for the most recently completed 24-hour bin, frozen once the day rolled over in this IGMP snooping/proxy PM table ended — the moment it stopped accumulating and became final. It turns a floating bin into an anchored historical record; without it, an admin pulling this bin's counters later would have no way to know which exact interval they describe, since it is the metadata field for the most recently completed 24-hour bin, frozen once the day rolled over in this IGMP snooping/proxy PM table. For the most recently completed 24-hour bin, frozen once the day rolled over in this IGMP snooping/proxy PM table, this might read a value like "2026-07-04,07:45:00", which an admin lines up against a customer-reported outage window to see if it falls inside or outside this bin.