[Boost-users] Missing functions in date_time library

I am using the boost date_time library and noticed that there is a from_ftime() function to convert a FILETIME into a ptime, but I could not find the reverse operation to_ftime(). Am I missing it somewhere? Likewise, I am using the c_local_adjustor::utc_to_local() function and cannot find the corresponding local_to_utc() function in c_local_adjustor. Thanks, Sean