The War of the Spider Queen series takes place in the current game year of the Realms, which is 1372 DR (Year of Wild Magic). Information about what's happend thus far in the War can be found in the Player's Guide to Faerun, pg 170.
The Time of Trouble was 1358 DR (Year of Shadows)
The Baldur's Gate I novel occured in 1368 DR (Year of the Banner)
The Baldur's Gate II novels occured in 1369 DR (Year of the Gauntlet)