This DateAndTime value records the last time this specific stage's status changed, separate from the FSM-level completion timestamp. For a multi-stage applying, verifying, or renewing that IPv6 address (for example after a static change or a DHCPv6/SLAAC lease renewal) workflow, this lets an admin see how long the job has been sitting in its current stage, which is often the key clue that a job is hung rather than merely slow. A stale value like '2026-08-10,01:03:44.0,+0.0' that never advances is the signal of a stuck stage.