Проблема с рабочим временем. (Календарь не рабочих дат)

public static class ExchangeBoardHelper
    {
        public static void ApplyHolidays2013(this ExchangeBoard board)
        {
            if (board == null)
                throw new ArgumentNullException("board");
            var holidays = new List<DateTime>();
            const int year = 2013;

            //https://rts.micex.ru/s690
            for (var i = 1; i <= 7; i++)
                holidays.Add(new DateTime(year, 1, i));

            holidays.Add(new DateTime(year, 3, 8));
            holidays.Add(new DateTime(year, 5, 1));
            holidays.Add(new DateTime(year, 5, 9));
            holidays.Add(new DateTime(year, 6, 12));
            holidays.Add(new DateTime(year, 11, 4));

            board.WorkingTime.SpecialHolidays = holidays.ToArray();
        }

        public static void ApplyHolidays2012(this ExchangeBoard board)
        {
            if (board == null)
                throw new ArgumentNullException("board");

            const int year = 2012;

            //https://rts.micex.ru/a254
            var holidays = new[,] { { 1, 2 }, { 2, 23 }, { 3, 8 }, { 3, 9 }, { 4, 30 }, { 5, 1 }, { 5, 9 }, { 6, 11 }, { 6, 12 }, { 11, 5 }, { 12, 31 } };
            var holidayDates = new List<DateTime>();
            for (var i = 0; i < holidays.GetLength(0); i++)
                holidayDates.Add(new DateTime(year, holidays[i, 0], holidays[i, 1]));
            board.WorkingTime.SpecialHolidays = holidayDates.ToArray();

            var workingDays = new[,] { { 3, 11 }, { 4, 28 }, { 5, 5 }, { 5, 12 }, { 6, 9 } };
            var workingDates = new List<DateTime>();
            for (var i = 0; i < workingDays.GetLength(0); i++)
                workingDates.Add(new DateTime(year, workingDays[i, 0], workingDays[i, 1]));
            board.WorkingTime.SpecialWorkingDays = workingDates.ToArray();
        }
    }