using System;

    using Newtonsoft.Json;              

public class Program

{

    public static void Main()

    {       

        var data = DateTime.Parse("2023-12-07T17:26:52.976784+01:00");

        Console.WriteLine(Serialize(data));

    }

    public static string Serialize(DateTime d){

        var settings = new JsonSerializerSettings

        {

            DateFormatHandling = DateFormatHandling.IsoDateFormat,

            DateTimeZoneHandling = DateTimeZoneHandling.Utc, // Assurez-vous que la date est traitée comme UTC

            NullValueHandling = NullValueHandling.Ignore

        };

        return JsonConvert.SerializeObject(d, settings);

    }

}