13位时间戳C#

   /// <summary>  
   /// 将c# DateTime时间格式转换为Unix时间戳格式  
   /// </summary>  
   /// <returns>string</returns>  
   private static string ConvertDateTimeToString()
   {

       System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new     
       System.DateTime(1970, 1, 1));
       //除10000调整为13位
       long timeStamp = (long)(DateTime.Now.Ticks - startTime.Ticks) / 10000;   
       string stamp = timeStamp.ToString();               
       return stamp;
   }