using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<int> dates = new List<int> 

        { 

            42973,

            42974,

            42975

        };

        foreach(var date in dates)

        {       

            var convertedDate =  DateTime.FromOADate(date);

            Console.WriteLine("{0} => {1:yyyy-MM-dd} / {2}", date, convertedDate, convertedDate.DayOfWeek);

        }

    }

}