/// <summary>
/// 获取时间戳（精确到毫秒）
/// </summary>
/// <param name="time">时间</param>
public static long ConvertDateTiemp(DateTime time)
{
    return ((time.ToUniversalTime().Ticks - 621355968000000000) / 10000000) * 1000;
}

/// <summary>
/// 时间戳转为C#格式时间
/// </summary>
/// <param name="timeStamp"></param>
/// <returns></returns>
public static DateTime GetTime(string timeStamp)
{
    if (timeStamp.Length > 10)
    {
        timeStamp = timeStamp.Substring(0, 10);
    }
    DateTime dateTimeStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
    long lTime = long.Parse(timeStamp + "0000000");
    TimeSpan toNow = new TimeSpan(lTime);
    return dateTimeStart.Add(toNow);
}