using System;

public class Program

{

    public static void Main()

    {

        var data = new {

            a_double = 6.0d,

            a_decimal = 6.0m,

            zero = 0.0m,

        };

        var json = System.Text.Json.JsonSerializer.Serialize(data);

        Console.WriteLine(json);

        Console.WriteLine(DateTimeOffset.UtcNow.ToString("O"));

        Console.WriteLine(DateTimeOffset.UtcNow.DateTime.ToString("O"));

        Console.WriteLine("************************");

        Console.WriteLine(DateTimeOffset.UtcNow.UtcDateTime.ToString("O"));

        Console.WriteLine(DateTime.UtcNow.ToString("O"));

​

    }

}