docs: private static double date_msecFromDate(double year, double mon,
                                              double mday, double hour,
                                              double min, double sec,
                                              double msec)
      {
          double day;
          double time;
          double result;
  
          day = MakeDay(year, mon, mday);
          time = MakeTime(hour, min, sec, msec);
          result = MakeDate(day, time);
          return result;
      }