using System;

​

namespace Anniversary_Count

{

    class Program

    {

        static void Main(string[] args)

        {

            //Console.WriteLine("Hello World!");

            DateTime start_time = new DateTime(2018,12,17,0,0,0);

            //DateTime today = new DateTime();

            DateTime today = DateTime.Now;

            int days = (today - start_time).Days;

            int years = days / 365;

            int fromY = start_time.Year+1;

            int endY = today.Year;

            int day = 0;

            while (fromY< endY)

            {

                day = fromY % 4 == 0 ? day + 366 : day + 365;

                fromY++;

            }

            string count = ((today - start_time).Days- day   ).ToString();

            Console.WriteLine("起始日:{0}", start_time.ToString());

            Console.WriteLine("Today:{0}" , today.ToString());

            Console.WriteLine("結婚{0}周年 + {1}天 快樂!!", years , count );

            Console.ReadLine();

        }

    }

}

​