C#中时间戳和日期相互转换

1、日期转换时间戳

 /// <summary>
        /// 将日期转换为时间戳
        /// </summary>
        /// <param name="time"></param>
        /// <returns></returns>
        private long ConverDateTimeToLong(DateTime time)
        {
            DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1, 0, 0, 0, 0));
            long t = (time.Ticks - startTime.Ticks) / 10000;   //除10000调整为13位      
            return t;
        }

2、时间戳转换日期

/// <summary>
        /// 将时间戳转换为日期
        /// </summary>
        /// <param name="timespan"></param>
        /// <returns></returns>
        private DateTime ConvertToDateTime(long timespan)
        { 
            DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
            string l = timespan + "0000";
            TimeSpan ts = new TimeSpan(long.Parse(l));
            return dtStart.Add(ts);
        }