string NameWeekDay(ENUM_DAY_OF_WEEK f_weekDay) // dzień tygodnia
  {
   switch(f_weekDay)
     {
      case SUNDAY:    return "Sunday";
      case MONDAY:    return "Monday";
      case TUESDAY:   return "Tuesday";
      case WEDNESDAY: return "Wednesday";
      case THURSDAY:  return "Thursday";
      case FRIDAY:    return "Friday";
      case SATURDAY:  return "Saturday";
      default:        return "Unknown day of week";
     }
  }