This read-only DisplayString records the collection start time of the most recently completed 24-hour bin, frozen once the day rolled over in this IGMP snooping/proxy PM table — the timestamp when the counters it holds began accumulating. Admins check it to confirm exactly which wall-clock window the other counters in this bin cover before comparing it to a different bin or lining it up with a trouble-ticket time, 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 "2026-07-13,03:06:00", which an admin lines up against a customer-reported outage window to see if it falls inside or outside this bin.