Late Night Shuttle Bus from Beijing Airport to Xidan

Can I know what time is the last shuttle bus to city ?
I phoned to Beijing Airport and I am told the last bus is after the last of domestic flights and it don't stop at Xidan Aviation Building anymore but now last stop is the Beijing Train Station.
Can someone please confirm ? And usually what time is the last bus ?
I will arrive at Terminal 2, 1 am international arrival, I wonder if I can still catch the bus ?