C#時間戳和DateTime的相互轉換

  /// <summary>  
        /// 將c# DateTime時間格式轉換為Unix時間戳格式  
        /// </summary>  
        /// <param name="time">時間</param>  
        /// <returns>long</returns>  
        public static long ConvertDateTimeToLong(DateTime time)
        {
            DateTime startTime = TimeZoneInfo.ConvertTime(new DateTime(1970, 1, 1, 0, 0, 0, 0), TimeZoneInfo.Local);
            long t = (time.Ticks - startTime.Ticks) / 10000;   //除10000調整為13位      
            return t;
        }

        /// <summary>        
        /// 時間戳轉為C#格式時間        
        /// </summary>        
        /// <param name=”timeStamp”></param>        
        /// <returns></returns>        
        public static DateTime ConvertLongToDateTime(long timeStamp)
        {
            DateTime dtStart = TimeZoneInfo.ConvertTime(new DateTime(1970, 1, 1, 0, 0, 0, 0), TimeZoneInfo.Local);
            long lTime = timeStamp * 10000;
            TimeSpan toNow = new TimeSpan(lTime);
            return dtStart.Add(toNow);
        }