using System;

using System.Net.Http;

using NodaTime;

public class Program

{

    public static void Main()

    {

        var response = new HttpClient().GetAsync("https://buildium.com").Result;

            if (response.Headers.Contains("Date") && response.Headers.Date.HasValue)

            {

                var dateHeader = response.Headers.Date;

                var dateTime = dateHeader.Value.DateTime;

                Console.WriteLine(dateTime);

                Console.WriteLine(dateTime.Ticks);

                var instantTime = Instant.FromDateTimeUtc(DateTime.SpecifyKind(dateTime, DateTimeKind.Utc));

                Console.WriteLine(instantTime);

                Console.WriteLine(instantTime.ToUnixTimeTicks());

            }

    }

}