c#如何根据时间戳校验本地系统时间_c#怎么获取被人修改了系统时间

在工作中，经常遇到本地设备与服务器进行时间校验。通常是从服务器获取复凄凄的时间戳，并将时间戳转化为时间，并将该时间设置成本地时间，这样我们就可以保持本地时间和服务器时间的一致性。

class ChangeSYSTime
    {
        [DllImport("kernel32.dll")]
        public static extern bool SetSystemTime(ref SYSTEMTIME st);
        [DllImport("Kernel32.dll")]
        public static extern bool SetLocalTime(ref SYSTEMTIME st);
        [DllImport("Kernel32.dll")]
        public static extern void GetSystemTime(ref SYSTEMTIME st);
        [DllImport("Kernel32.dll")]
        public static extern void GetLocalTime(ref SYSTEMTIME st);
        
        public static bool SetLocalTimeByStr(string timestr)
        {
            bool flag = false;
            SYSTEMTIME sysTime = new SYSTEMTIME();
            DateTime dt = Convert.ToDateTime(timestr);
            sysTime.wYear = Convert.ToUInt16(dt.Year);	           
            sysTime.wMonth = Convert.ToUInt16(dt.Month);
            sysTime.wDay = Convert.ToUInt16(dt.Day);
            sysTime.wHour = Convert.ToUInt16(dt.Hour);
            sysTime.wMinute = Convert.ToUInt16(dt.Minute);
            sysTime.wSecond = Convert.ToUInt16(dt.Second);
            try
            {
                flag = SetLocalTime(ref sysTime);
            }
            catch(Exception ex)
            {
                string e = ex.Message;
                return false;
            }
            return flag;
        }

        /// <summary>        
        /// 时间戳转为C#格式时间        
        /// </summary>        
        /// <param name=”timeStamp”></param>        
        /// <returns></returns>        
        public static DateTime ConvertStringToDateTime(string timeStamp)
        {
            DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
            long lTime = long.Parse(timeStamp + "0000");
            TimeSpan toNow = new TimeSpan(lTime);
            return dtStart.Add(toNow);
        }

        /// <summary>
        /// 时间戳转为C#格式时间10位
        /// </summary>
        /// <param name="timeStamp">Unix时间戳格式</param>
        /// <returns>C#格式时间</returns>
        public static DateTime GetDateTimeFrom1970Ticks(long curSeconds)
        {
            DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
            return dtStart.AddSeconds(curSeconds);
        }


    }

    [StructLayout(LayoutKind.Sequential)]
    public struct SYSTEMTIME
    {
        public ushort wYear;
        public ushort wMonth;
        public ushort wDayOfWeek;
        public ushort wDay;
        public ushort wHour;
        public ushort wMinute;
        public ushort wSecond;
        public ushort wMilliseconds;
    }
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