Support Board

int HolidayCheck(SCDateTime InputDateTime)
{
  int year = InputDateTime.GetYear();
  int GF_Day {0};
  int GF_Month {0};
  int g = (int)(year % 19);
  int c = (int)(year / 100);
  int h = (int)((c - (int)(c / 4) - (int)((8 * c + 13) / 25) + 19 * g + 15) % 30);
  int i = h - (int)(h / 28) * (1 - (int)(h / 28) * (int)(29 / (h + 1)) * (int)((21 - g) / 11));
  GF_Day = i - (int)((year + (int)(year / 4) + i + 2 - c + (int)(c / 4)) % 7) + 26;
  GF_Month = 3;
  if (GF_Day > 31) {
    GF_Month++;
    GF_Day -= 31;
  }

  int Month {InputDateTime.GetMonth()};
  int Day {InputDateTime.GetDay()};
  int WeekDay {InputDateTime.GetDayOfWeek()};
  int ReturnValue {0};

  if (WeekDay != 6) {
    if (
      Month==1 && Day==1
      ||
      Month==1 && Day==2 && WeekDay==1
      ||
      Month==GF_Month && Day==GF_Day
      ||
      Month==7 && Day==4
      ||
      Month==11 && WeekDay==4 && Day>21 && Day<=28
      ||
      Month==12 && Day==25
      ||
      Month==12 && Day==24 && WeekDay==5
      ||
      Month==12 && Day==26 && WeekDay==1
    )
      ReturnValue = 1;

    if (
      Month==1 && WeekDay==1 && Day>14 && Day<=21
      ||
      Month==2 && WeekDay==1 && Day>14 && Day<=21
      ||
      Month==5 && WeekDay==1 && Day+7>31
      ||
      Month==6 && Day==19
      ||
      Month==6 && Day==18 && WeekDay==5
      ||
      Month==6 && Day==20 && WeekDay==1
      ||
      Month==7 && Day==3 && WeekDay>0 && WeekDay<6
      ||
      Month==7 && Day==5 && WeekDay==1
      ||
      Month==9 && WeekDay==1 && Day<=7
      ||
      Month==11 && WeekDay==5 && Day-1>21 && Day-1<=28
      ||
      Month==12 && Day==24 && WeekDay>0 && WeekDay<5
    )
      ReturnValue = 2;
  }

  return ReturnValue;
}