using System;

using System.Text;

using Newtonsoft.Json.Schema;

​

//nuget Newtonsoft.Json.Schema v2.0.8

​

public class Program

{

    public static void Main()

    {

        var origNumDays = (DateTime.MinValue - new DateTime(1997, 1, 1)).Days;

        var bitValue =  Convert.ToString((DateTime.MinValue - new DateTime(1997, 1, 1)).Days, 2);

        var numDays = Convert.ToInt32( bitValue.PadLeft(14, '0').Substring(0, 14), 2);

        Console.WriteLine("Original num days:" + origNumDays + "bit value =" + bitValue + " -> cut 14 bit = "+ bitValue.PadLeft(14, '0').Substring(0, 14) + " cut numdays = " + numDays);

        Console.WriteLine("What we sent:" + new DateTime(1997, 1, 1).AddDays(numDays));

    }

}   

​