C#获取互联网时间

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public static DateTime get_internet_time() {     WebRequest request = null;     WebResponse response = null;     WebHeaderCollection headerCollection = null;     string datetime = string.Empty;     try     {         request = WebRequest.Create("https://www.baidu.com");         request.Timeout = 1000;         request.Credentials = CredentialCache.DefaultCredentials;         response = (WebResponse)request.GetResponse();         headerCollection = response.Headers;           foreach (var h in headerCollection.AllKeys)         {             if (h == "Date")             {                 datetime = headerCollection[h];                   var dt = DateTime.Parse(datetime);                 return dt;             }         }         return new DateTime();     }     catch (Exception) { return new DateTime(); }     finally     {         if (request != null)         { request.Abort(); }         if (response != null)         { response.Close(); }         if (headerCollection != null)         { headerCollection.Clear(); }     } }