C#获取网络时间

using System;

using System.Collections.Generic;
using System.Text;
using System.Net;

namespace DateTime
{
    public class GetNetDateTime
    {
        ///<summary>
        /// 获取网络日期时间  
        /// </summary>  
        /// <returns></returns>  
        public static string GetNetDateTimes()
        {
            WebRequest request = null;
            WebResponse response = null;
            WebHeaderCollection headerCollection = null;
            string datetime = string.Empty;
            try
            {
                System.Net.ServicePointManager.CertificatePolicy = new TrustAllCertificatePolicy();//  代码就可以顺利和https服务器建立SSL通道

                request = WebRequest.Create("https://www.baidu.com");
                request.Timeout = 3000;