This field reports collection end time of the bin, exposed here as cienaCesPmBasicTxRxHistoryBinEndTime. On this Ciena CES port's PM data, this DisplayString timestamp marks when this now-closed history bin stopped accumulating, letting you line it up precisely against other event logs (syslog, alarms) to confirm whether something else on the device happened at the same moment; and this lives in the basic bandwidth-profile-aware PM group's history bin — a closed-out interval whose own Duration and State tell you how long it ran and whether it closed cleanly, so the number is settled rather than still being written to. For example, this field holding a value like '2026-08-06,14:30:00.0' tells you precisely which wall-clock window the rest of this bin's counters cover.