BudgetAnalyser.Engine.NewZealandPublicHolidays.FixedDateHoliday.CalculateDate C# (CSharp) Метод

            public override DateTime CalculateDate(DateTime start, DateTime end)
            {
                var proposed = DateTime.MinValue;
                for (var year = start.Year; year <= end.Year; year++)
                {
                    proposed = new DateTime(year, Month, Day);
                    if (proposed >= start && proposed <= end)
                    {
                        break;
                    }
                }

                if (MondayiseIfOnWeekend &&
                    (proposed.DayOfWeek == DayOfWeek.Saturday || proposed.DayOfWeek == DayOfWeek.Sunday))
                {
                    do
                    {
                        proposed = proposed.AddDays(1);
                    } while (proposed.DayOfWeek != DayOfWeek.Monday);
                }

                if (proposed < DateTime.MinValue.AddMonths(1))
                {
                    throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture,
                        "Cannot find a suitable date between {0} and {1}", start, end));
                }

                return proposed;
            }
        }