Implements a Multi Calculated Holiday based on you BL

A multi-calculated holiday is an abstract class that allows you in a single step to generate a list of Holiday Dates based on the year passed to the Utility.

WorkingOnSaturdayIfOdd

    /// <summary>
    /// An example implementation of <see cref="MultiCalculatedHoliDay"/>  
    /// </summary>
    /// <seealso cref="PH.WorkingDaysAndTimeUtility.Configuration.MultiCalculatedHoliDay" />
    public class WorkingOnSaturdayIfOdd : MultiCalculatedHoliDay
    {
        internal WorkingOnSaturdayIfOdd() : base(0, 0)
        {
        }

        public override Type GetHolyDayType() => typeof(WorkingOnSaturdayIfOdd);

        /// <summary>Calculates the list of MultiCalculatedHoliDays for the given year.</summary>
        /// <param name="year">The year.</param>
        /// <returns></returns>
        public override List<DateTime> CalculateList(int year)
        {
            var         first        = new DateTime(year, 1, 1, 0, 0, 0);
            var         last         = new DateTime(year +1, 1, 1, 0, 0, 0);
            CultureInfo myCI         = new CultureInfo("it-IT");
            var         baseHolidays = new List<DateTime>();
            int         add          = 1;
            while (first < last)
            {
                if (first.DayOfWeek == DayOfWeek.Saturday)
                {
                    add = 7;
                    var weekNumber = myCI.Calendar.GetWeekOfYear(first, CalendarWeekRule.FirstDay, DayOfWeek.Monday);
                    if (weekNumber % 2 == 0)
                    {
                        baseHolidays.Add(first);
                    }
                }

                first = first.AddDays(add);
            }

            return baseHolidays;
        }
    }