Yes it has a very accurate RTC clock, around ~1..2ppm, constant temperature calibration.
A timestamp is always sent/logged with Sat data.
At server side, when data is received, it will be computed to reach a Lat/Lon "real" value. It can then be plotted/graphed/...
Knowing which Sat it is and its RSSI, we can use these values with Keplerian data and perform all calculations. All done at server side to save power and time at Node side.