This DisplayString field records the wall-clock timestamp at which this bin's counters were last cleared (reset to zero). Because this is the currently open, still-accumulating measurement interval that keeps climbing until its boundary is reached and it rolls off into the history table, ClearedTime is what you check first when a counter value looks smaller than expected — it may simply have been zeroed recently rather than indicating low traffic. For example, a ClearedTime showing five minutes ago explains why the forward-direction byte counters in this same row are still low even if the tunnel is heavily loaded.