We recently upgraded to Boost 1_36_0. The following line used to compile correctly: boost::posix_time::time_duration td = us_dst_rules::dst_start_offset(); However, now I get the following error: error C2039: 'dst_start_offset' : is not a member of 'boost::date_time::us_dst_rules' Does anyone have any insight on how to correct this issue? Joseph A. Marks