C#更改系统时间

第一种方法：就是调用系统API函数更改系统时间

 [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 wMiliseconds;
    }
   public class SetSystemDateTime
    {
       [DllImport("Kernel32.dll")]
       public static extern bool SetLocalTime(ref SystemTime sysTime);

       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 = SetSystemDateTime.SetLocalTime(ref sysTime);
           }
           catch (Exception e)
           {
               Console.WriteLine("SetSystemDateTime函数执行异常" + e.Message);
           }
           return flag;
       }
    }

第二种方法：就是利用Process类调用DOC命令更改系统时间

 

             //实例一个Process类，启动一个独立进程
             Process p = new Process(); 
               //Process类有一个StartInfo属性
             //设定程序名
             p.StartInfo.FileName = "cmd.exe";
             //设定程式执行参数    “/C”表示执行完命令后马上退出
             p.StartInfo.Arguments = "/c date 2020-2-20"; 
              //关闭Shell的使用  
            p.StartInfo.UseShellExecute = false;   
            //重定向标准输入     
            p.StartInfo.RedirectStandardInput = true; 
            p.StartInfo.RedirectStandardOutput = true;
              //重定向错误输出  
           p.StartInfo.RedirectStandardError = true;  
              //设置不显示doc窗口 
            p.StartInfo.CreateNoWindow = true;          
            //启动
            p.Start(); 

          //从输出流取得命令执行结果
           return p.StandardOutput.ReadToEnd();

    

          更多的关于Process类的操作，可以参考

    http://msdn.microsoft.com/zh-cn/library/system.diagnostics.process_members(VS.80).aspx