This read-create DisplayString specifies, when set, the local-time-zone collection start time for a PM instance in hh:mm or hh:mm:ss format, per its description, defaulting to 00:00:00 if only cienaCesPmInstanceStartDate is set; when read back, it reports the full start date and time formatted like 'Wed Jun 30 21:49:08 1993', with a trailing 'Z' denoting UTC. This lets an engineer schedule a PM collection window to begin at a specific time of day, for example to align with a maintenance window or a known traffic pattern, rather than starting collection immediately upon instance creation. An engineer wanting PM data collection to begin precisely at the start of a change window would set this field to that window's start time rather than relying on instance creation time.