Windows XP time changer/setter.

#include <Windows.h>
#include <sysinfoapi.h>

int main()
{
    SYSTEMTIME sys_time;
    GetSystemTime(&sys_time);

    sys_time.wHour = 12;
    sys_time.wMinute = 0;
    sys_time.wSecond = 0;
    sys_time.wMilliseconds = 0;

    while (TRUE)
    {
        BOOL result = SetSystemTime(&sys_time);
        if (!result)
        {
             return result;
        }

        Sleep(60000);
    }
}