BFG 2 Timeline vs Gaunts Ghost

Does anyone know when exactly BFG 2 took place ?

After or before the Sabbat Crusade and how many years in difference ?

The game takes place shortly after the 13th Black Crusade, 999M41 (events are detailed in Gathering Storm).

Sabbat Crusade is most likely over. The last content takes place during the year 791M41