#include <windows.h>
#include <wchar.h>

#define NSECS 60*60*3

int wmain(void) {

    SYSTEMTIME st = {0};
    FILETIME ft = {0};

    GetLocalTime(&st);

    wprintf(L"%02d/%02d/%04d %02d:%02d:%02d\n",
        st.wDay, st.wMonth, st.wYear, st.wHour, st.wMinute, st.wSecond);

    SystemTimeToFileTime(&st, &ft);

    ULARGE_INTEGER u = {0};
     
    memcpy(&u, &ft, sizeof(u));
    u.QuadPart += NSECS * 10000000LLU;
    memcpy(&ft, &u, sizeof(ft));

    FileTimeToSystemTime(&ft, &st);

    wprintf(L"%02d/%02d/%04d %02d:%02d:%02d\n",
        st.wDay, st.wMonth, st.wYear, st.wHour, st.wMinute, st.wSecond);

    return 0;
}