C# 13位时间戳 转换为 标准时间

原地址：https://www.cnblogs.com/yixuehan/p/5559244.html

    /// <summary>
    /// 时间戳转换成标准时间
    /// </summary>
    /// <param name="timeStamp">时间戳</param>
    /// <returns></returns>
    private DateTime ConvertToTime(string timeStamp)
    {
        DateTime time = DateTime.Now;
        if (string.IsNullOrEmpty(timeStamp))
        {
            return time;
        }
        try
        {
            DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
            long lTime = long.Parse(timeStamp + "0000");
            TimeSpan toNow = new TimeSpan(lTime);
            time = dtStart.Add(toNow);
        }
        catch (Exception ex)
        {
            log.Warn(ex.Message);
        }
        return time;
    }