This DisplayString field records the wall-clock timestamp at which this measurement bin began collecting data. Because this row is a closed, already-completed measurement interval kept in the CES-PM history table — a fixed, immutable snapshot of one specific past window, this timestamp is what you anchor every counter in the same row to — without it you cannot tell whether a spike in the traffic counters happened this morning or three intervals ago. For example, if this field reads '2026-08-07 14:00:00' for the most recently completed 15-minute bin, that tells you it started at 2pm, so any alarm correlated to a 2:05pm outage should be read against this row rather than an adjacent one.