using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        // L'année prochaine

        PrintHolidays(DateTime.Now.Year + 1);

        // Changer ici l'année pour afficher n'importe laquelle...

        PrintHolidays( 2017 );

    }

    public static void PrintHolidays(int year)

    {

        Console.WriteLine("CDI's holidays for " + year);

        foreach (var hol in GetPubHolidays(year))

        {

            Console.WriteLine(hol.Stamp.ToString("dd.MM")+"  "+hol.Stamp.DayOfWeek.ToString().Substring(0,3) + "  "+hol.Description);

        }

        Console.WriteLine();

    }

    public static List<PubHoliday> GetPubHolidays(int year)

    {

        DateTime easterSun = EasterSunday(year);

        var ret = new List<PubHoliday>

        {

            new PubHoliday(new DateTime(year, 1, 1), "Nouvel An"),

            new PubHoliday(easterSun.AddDays(-2), "Vendredi Saint"),

            new PubHoliday(easterSun.AddDays(1), "Pâques"),

            new PubHoliday(easterSun.AddDays(39), "Ascension"),

            new PubHoliday(easterSun.AddDays(50), "Pentecôte"),

            new PubHoliday(easterSun.AddDays(60), "Fête-Dieu"),

            new PubHoliday(new DateTime(year, 8, 1), "Fête Nationale"),

            new PubHoliday(new DateTime(year, 8, 15), "Assomption"),

            new PubHoliday(new DateTime(year, 11, 1), "Toussaint"),

            new PubHoliday(new DateTime(year, 12, 8), "Immaculée Conception"),

            new PubHoliday(new DateTime(year, 12, 25), "Noël"),

            new PubHoliday(new DateTime(year, 12, 26), "St Etienne")

        };

​

        // Les p'tites magouilles de derrière les fagots

        if (year >= 2015 && DayOfWeek.Saturday == new DateTime(year, 12, 25).DayOfWeek)

        {

            ret.Add(new PubHoliday(new DateTime(year, 12, 31), "Congé 24 & 31 après-midi"));

        }

        else if (year > 2015 && DayOfWeek.Sunday == new DateTime(year - 1, 12, 25).DayOfWeek)

        {

            ret.Add(new PubHoliday(new DateTime(year, 1, 2), "Récupération 25 & 1e sur weekend"));

        }

        return ret;

    }

    // http://stackoverflow.com/a/2510411/480215

    public static DateTime EasterSunday(int year)

    {

        int day = 0;

        int month = 0;

        int g = year % 19;

        int c = year / 100;

        int h = (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));

        day = i - ((year + (int)(year / 4) + i + 2 - c + (int)(c / 4)) % 7) + 28;

        month = 3;

        if (day > 31)

        {

            month++;

            day -= 31;

        }

        return new DateTime(year, month, day);

    }

}

​

public class PubHoliday

{

    public DateTime Stamp { get; set; }

    public string Description { get; set; }

    public PubHoliday(DateTime stamp, string desc)

    {

        Stamp = stamp;

        Description = desc;

    }

}

​