[boost::date_time] posix_time::to_simple_string and posix_time::time_from_string

These 2 functions don't seem to work together. to_simple_string will produce a string such as 2003-Jul-08 11:55:47 But time_from_string expects 2003-07-08 11:55:47 This means you can't convert to a string (to store in a text file) then read back in and convert it back to a ptime. Is this a bug, or have I missed a conversion function that can handle this? Thanks Russell