timestamp is a few hours less than the actual time

[wumn290]

Call FileTimeToLocalFileTime before calling FileTimeToSystemTime to correct the time zone of FILETIME

std::string convert_filetime_string
(
const FILETIME from
)
{
SYSTEMTIME stime;
FILETIME localFileTime;
FileTimeToLocalFileTime(std::addressof(from), std::addressof(localFileTime));
::FileTimeToSystemTime(std::addressof(localFileTime), std::addressof(stime));
std::string to = convert_systemtime_string(stime);
return to;
}