Form1.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
namespace getnettime
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        // 下载于www.51aspx.com
        int nSize;
        /// <summary>
        /// 获取网络时间
        /// </summary>
        /// <returns></returns>
        public System.DateTime GetServerDateTime()
        {
            string[,] TimeServer = new string[14, 2];
            int[] SearchOrder = new int[] { 1, 2, 4, 8, 9, 6, 11, 5, 10, 0, 3, 7, 12 };
            TimeServer[0, 0] = "time-a.nist.gov";
            TimeServer[0, 1] = "129.6.15.28";
            TimeServer[1, 0] = "time-b.nist.gov";
            TimeServer[1, 1] = "129.6.15.29";
            TimeServer[2, 0] = "time-a.timefreq.bldrdoc.gov";
            TimeServer[2, 1] = "132.163.4.101";
            TimeServer[3, 0] = "time-b.timefreq.bldrdoc.gov";
            TimeServer[3, 1] = "132.163.4.102";
            TimeServer[4, 0] = "time-c.timefreq.bldrdoc.gov";
            TimeServer[4, 1] = "132.163.4.103";
            TimeServer[5, 0] = "utcnist.colorado.edu";
            TimeServer[5, 1] = "128.138.140.44";
            TimeServer[6, 0] = "time.nist.gov";
            TimeServer[6, 1] = "192.43.244.18";
            TimeServer[7, 0] = "time-nw.nist.gov";
            TimeServer[7, 1] = "131.107.1.10";
            TimeServer[8, 0] = "nist1.symmetricom.com";
            TimeServer[8, 1] = "69.25.96.13";
            TimeServer[9, 0] = "nist1-dc.glassey.com";
            TimeServer[9, 1] = "216.200.93.8";
            TimeServer[10, 0] = "nist1-ny.glassey.com";
            TimeServer[10, 1] = "208.184.49.9";
            TimeServer[11, 0] = "nist1-sj.glassey.com";
            TimeServer[11, 1] = "207.126.98.204";
            TimeServer[12, 0] = "nist1.aol-ca.truetime.com";
            TimeServer[12, 1] = "207.200.81.113";
            TimeServer[13, 0] = "nist1.aol-va.truetime.com";
            TimeServer[13, 1] = "64.236.96.53";

            System.DateTime ret;
            ret = System.DateTime.MinValue;