First things first, hello FFG-forums!
I'll be to the point. We were having some thoughts in our group on exactly WHEN the official material of Rogue Trader is supposed to take place. Now, I might be wrong, but I'm pretty sure no official date is in the corebook, and I haven't read all the supplements. Is there an official date, or is it simply up to the specific GM to decide when (or roughly when) it all occurs? My guess was that 999.M41, but I really have no idea.