time_t和SYSTEMTIME之间的相互转换

/***<a target=_blank href="http://www.cnblogs.com/FCoding/archive/2012/11/09/2762982.html">time_t转SYSTEMTIME</a>*//***<a target=_blank href="http://www.cnblogs.com/FCoding/archive/2012/11/09/2762982.html">SYSTEMTIME转time_t</a>*//***time_t转SYSTEMTIME*//***SYSTEMTIME转time_t*/time_t SystemTimeToTime_t( const SYSTEMTIME& st ){    tm temptm = {st.wSecond,                          st.wMinute,                          st.wHour,                          st.wDay,                          st.wMonth - 1,                          st.wYear - 1900,                          st.wDayOfWeek,                          0,                          0};     return mktime(&temptm);