DateTime和TimeStamp相互转换

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   /// <summary>
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   /// 本时区日期时间转成UTC时间并计算时间戳，精确到毫秒
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   /// </summary>
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   /// <param name="local_datetime">本地时间</param>
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   /// <returns>13位UTC时间戳</returns>
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   public static long LocalDateTimeToUTCTimestamp(DateTime local_datetime)
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   {
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   DateTime dd = new DateTime(1970, 1, 1, 0, 0, 0, 0);
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   DateTime timeUTC = local_datetime.ToUniversalTime(); // DateTime.SpecifyKind(datetime, DateTimeKind.Utc);//本地时间转成UTC时间
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    TimeSpan ts = (timeUTC - dd);
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    return (Int64)ts.TotalMilliseconds;//精确到毫秒
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    }
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    /// <summary>
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    /// UCT时间计算的时间戳转本时区日期时间
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    /// </summary>
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    /// <param name="utc_timeStamp">UTC时间戳</param>
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    /// <returns>本地时间</returns>
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    public static DateTime UTCTimestampToLocalDateTime(long utc_timeStamp)
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    {
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    DateTime dd = new DateTime(1970, 1, 1, 0, 0, 0, 0);
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    utc_timeStamp = utc_timeStamp * 10000;
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    TimeSpan ts = new TimeSpan(utc_timeStamp);
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    return dd.Add(ts).ToLocalTime();
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    }
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    /// <summary>
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    /// 本时区日期时间转成本时区的时间戳，精确到秒
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    /// </summary>
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    /// <param name="local_datetime">本地时间</param>
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    /// <returns>10位本时区的时间戳</returns>
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    public static long DateTimeToTimestamp_Local(DateTime local_datetime)
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    {
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    DateTime dd = new DateTime(1970, 1, 1, 0, 0, 0, 0).ToLocalTime();
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    TimeSpan ts = (local_datetime - dd);
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    return (Int64)ts.TotalSeconds;//精确秒
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    }
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    /// <summary>
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    /// 将本时区的时间戳转本地日期时间
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    /// </summary>
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    /// <param name="local_timeStamp"></param>
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    /// <returns></returns>
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    public static DateTime TimestampToDateTime_Local(long local_timeStamp)
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    {
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    DateTime dtStart = new DateTime(1970, 1, 1, 0, 0, 0).ToLocalTime();
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    long lTime = ((long)local_timeStamp * 10000000);
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    TimeSpan toNow = new TimeSpan(lTime);
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    DateTime targetDt = dtStart.Add(toNow);
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    return targetDt;
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    }
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    /// <summary>
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    /// 测试单击事件
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    /// </summary>
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    /// <param name="sender"></param>
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    /// <param name="e"></param>
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    private void Btn_Click(object sender, RoutedEventArgs e)
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    {
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    var dtNow = DateTime.Now;
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    System.Diagnostics.Debug.WriteLine("DateNow:" dtNow.ToString("yyyy-MM-dd HH:mm:ss.fff"));
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    var timeStamp1 = LocalDateTimeToUTCTimestamp(dtNow);
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    System.Diagnostics.Debug.WriteLine("timeStamp1:" timeStamp1);
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    var dateTime1 = UTCTimestampToLocalDateTime(timeStamp1);
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    System.Diagnostics.Debug.WriteLine("dateTime1:" dateTime1.ToString("yyyy-MM-dd HH:mm:ss.fff"));
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    var timeStamp2 = DateTimeToTimestamp_Local(dtNow);
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    System.Diagnostics.Debug.WriteLine("timeStamp2:" timeStamp2);
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    var dateTime2 = TimestampToDateTime_Local(timeStamp2);
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    System.Diagnostics.Debug.WriteLine("dateTime2:" dateTime2.ToString("yyyy-MM-dd HH:mm:ss.fff"));
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    }

测试结果：

DateNow:2022-11-23 15:44:51.173
timeStamp1:1669189491173
dateTime1:2022-11-23 15:44:51.173
timeStamp2:1669189491
dateTime2:2022-11-23 15:44:51.000

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