Timegm
virtual status_t Timegm(struct tm* inOutTm, time_t& timeOut);
status_t Timegm(struct tm* inOutTm, time_t& timeOut);
virtual status_t Timegm(struct tm* inOutTm, time_t& timeOut) = 0;
return fTimeConversion.Timegm(inOutTm, timeOut);
status_t status = backend->Timegm(inTm, timeOut);