using System;

using Newtonsoft.Json.Linq;

using System.Net;

public class Program

{

    public static void Main()

    {

        System.Net.HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://worldclockapi.com/api/json/utc/now"); // Obtiene el JSON del API REST

        System.Net.HttpWebResponse response = (HttpWebResponse)request.GetResponse();

        System.IO.StreamReader sr = new System.IO.StreamReader(response.GetResponseStream());

            // lee todo el codigo hasta el ultimo nodo

            string sourcecode = sr.ReadToEnd();

            // trae el codigo de inicio a fin parseado

            //Console.WriteLine(sourcecode);

        //String resp =  "{\"$id\":\"1\",\"currentDateTime\":\"2020-02-05T22:42Z\",\"utcOffset\":\"00:00:00\",\"isDayLightSavingsTime\":false,\"dayOfTheWeek\":\"Wednesday\",\"timeZoneName\":\"UTC\",\"currentFileTime\":132254161476540563,\"ordinalDate\":\"2020-36\",\"serviceResponse\":null}";

        dynamic datos = JObject.Parse(sourcecode);

        String fechaActual = datos.currentDateTime;

        fechaActual = fechaActual.Substring(0,10);  

        Console.WriteLine(fechaActual);

    }

}