using System;

public class Program

{

    public static void Main()

    {

        string b = "4352";

        double d = double.Parse(b);

​

        DateTime date = DateTime.FromOADate(d);

        Console.WriteLine(date);

        DateTime actualDate = DateTime.Parse("2022-11-30");

        Console.WriteLine(actualDate.ToOADate());

    }

}