获取北京时间

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Dynamic;
using System.Linq;
using System.Net;
using System.Net.Http;

namespace VerifyServerTime
{
    class Program
    {
        private static readonly string DEFAULT_Net = "http://www.baidu.com";
        static void Main(string[] args)
        {
            Run();
        }
        private static void Run()
        {
            var client = new HttpClient();
            var result = client.GetAsync(DEFAULT_Net).Result;
            var BeijingTime = result.Headers.Date.Value.LocalDateTime;

            var SystemTime = DateTime.Now;
            DateTime dateTime1 = Convert.ToDateTime(BeijingTime);
            DateTime dateTime2 = Convert.ToDateTime(SystemTime);
            TimeSpan ts1 = new TimeSpan(dateTime1.Ticks);
            TimeSpan ts2 = new TimeSpan(dateTime2.Ticks);
            TimeSpan ts = ts1.Subtract(ts2).Duration();
            var dateDiff = ts.Days.ToString() + "天" + ts.Hours.ToString() + "小时" + ts.Minutes.ToString() + "分钟" + ts.Seconds.ToString() + "秒";

            Console.WriteLine("北京时间：" + BeijingTime);
            Console.WriteLine("服务器时间：" + SystemTime);

            var DiffSeconds = int.Parse(ConfigurationManager.AppSettings["DiffSeconds"]);
            var EnterpriseWechatApi = ConfigurationManager.AppSettings["EnterpriseWechatApi"];

            if ((Math.Abs(ts.Seconds) > DiffSeconds) || ts.Minutes>0)
            {
                //获取iPv4地址
                IPAddress iip = Dns.GetHostAddresses(Dns.GetHostName()).FirstOrDefault(a => a.AddressFamily.ToString().Equals("InterNetwork"));

                var client2 = new HttpClient();
                string msg = string.Format(@"【{0}】服务器时间：{1}，北京时间：{2}，时间差异：{3}", iip, SystemTime, BeijingTime , dateDiff);
                string json = MessageContent(msg);
                HttpContent content = new StringContent(json);
                content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
                var result2 = client2.PostAsync(EnterpriseWechatApi, content).Result;
                Console.WriteLine("时间差异：" + json);
            }
            //var c = Console.ReadLine();
            //if (c == "1")
            //{
            //    Run();
            //}
        }

        private static string MessageContent(string msg)
        {
            List<string> mentioned_list = new List<string>();
            mentioned_list.Add("@sol");
            mentioned_list.Add("@all");

            Dictionary<string, object> matchKV = new Dictionary<string, object>();
            matchKV.Add("content", msg);
            matchKV.Add("mentioned_list", mentioned_list);
            dynamic obj = new ExpandoObject();
            obj.msgtype = "text";
            obj.text = matchKV;

            string json = JsonConvert.SerializeObject(obj);
            return json;
        }
    }

  
}