Yes, if the device sends its own time. A message like {"ts": 1759572000000, "values": {...}} is stored at ts, in milliseconds since 1970 UTC. A flat object is stored at the time it arrived. Two things to watch: a record more than 10 minutes in the future is refused as bad_ts, so keep the clocks synced, and an admin can set an oldest accepted age. Details on Timestamps, late and duplicate readings.