using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        getWeekDayCount(1920,DayOfWeek.Sunday);

    }

    public static void getWeekDayCount(int year,DayOfWeek weekday )

    {

    List<string> datelist = new List<string>();

           DateTime d = new DateTime(year, 1, 1); //從1月1號開始

            while (d.Year <= year)

            {

                if (d.DayOfWeek == weekday)

                {

                    Console.WriteLine(d.ToString("yyyy/MM/dd"));

                              d = d.AddDays(7); //抓到星期日直接+7天

                }else{

                 d = d.AddDays(1); //不是星期日 +1天繼續找

                }

            }

    }

}