This field reports clear time of the bin, exposed here as cienaCesPmBasicTxRxHistoryBinClearTime. On this Ciena CES port's PM data, this DisplayString timestamp marks exactly when the bin's counters were last reset to zero, so it tells you the true starting point for every cumulative counter that shares this bin — without it you can't tell whether a big number reflects a long uncleared history or a recent reset; 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.