腾讯的NTP时间Ip：[http://cgi.im.qq.com/cgi-bin/cgi_svrtime]
using System;
using UnityEngine;
using System.Collections;
public class IntTime : MonoBehaviour
{
private string timeURL = "http://cgi.im.qq.com/cgi-bin/cgi_svrtime";
IEnumerator Start()
{
WWW www = new WWW(timeURL);
yield return www;
DateTime date = Convert.ToDateTime(www.text);
}
}
