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## 当前时间转 Unix time (timespan ) ##

time_t timesp; // 0x00000000324ae141
time(&timesp);
int d = timesp ;
char* pszTimesp = asctime(gmtime(&timesp)); // Fri Dec 09 16:52:17 2013

// copy 来的 

SYSTEMTIME TimetToSystemTime(time_t t)

{

    FILETIME ft;

    SYSTEMTIME pst;

    LONGLONG nLL = Int32x32To64(t, 10000000) + 116444736000000000;

    ft.dwLowDateTime = (DWORD)nLL;

    ft.dwHighDateTime = (DWORD)(nLL >> 32);

    FileTimeToSystemTime(&ft, &pst);

    return pst;

}

 

time_t SystemTimeToTimet(SYSTEMTIME st)

{

    FILETIME ft;

    SystemTimeToFileTime( &st, &ft );

 

    LONGLONG nLL;

    ULARGE_INTEGER ui;

    ui.LowPart = ft.dwLowDateTime;

    ui.HighPart = ft.dwHighDateTime;

    nLL = (ft.dwHighDateTime << 32) + ft.dwLowDateTime;

    time_t pt = (long)((LONGLONG)(ui.QuadPart - 116444736000000000) / 10000000);

    return pt;

}

 

SYSTEMTIME Time_tToSystemTime(time_t t)

{

    tm temptm = *localtime(&t);

 

    SYSTEMTIME st = {1900 + temptm.tm_year, 

                                   1 + temptm.tm_mon, 

                                   temptm.tm_wday, 

                                   temptm.tm_mday, 

                                   temptm.tm_hour, 

                                   temptm.tm_min, 

                                   temptm.tm_sec, 

                                   0};

    return st;

}

 

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);

}