using System;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        DateRange dateRange = new DateRange 

        { 

            From = new DateTime(2019,12,05),

            To = new DateTime(2019, 12, 07)

        };

        Console.WriteLine(dateRange.ToString());

    }

}

​

class DateRange

{

    private JsonSerializerSettings _jsonSettings = new JsonSerializerSettings

            {

                DateFormatHandling = DateFormatHandling.MicrosoftDateFormat,

                Formatting = Formatting.Indented

            };

    public DateTime From { get; set; }

    public DateTime To {get; set;}

    public string FromJsonMSFormat => JsonConvert.SerializeObject(From, _jsonSettings);

    public string ToJsonMSFormat  => JsonConvert.SerializeObject(To, _jsonSettings);

    public override string ToString()

    {

        return string.Concat("From: ", FromJsonMSFormat, Environment.NewLine, "To: ", ToJsonMSFormat);

    }

}