unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    btn1: TButton;
    procedure btn1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

function SetSystemtime(ATime: TDateTime) : boolean;
Var
  ADateTime:TSystemTime;
  yy,mon,dd,hh,min,ss,ms : Word;
Begin
  decodedate(ATime ,yy,mon,dd);
  decodetime(ATime ,hh,min,ss,ms);
  With ADateTime Do
    Begin
      wYear:=yy;
      wMonth:=mon;
      wDay:=dd;
      wHour:=hh;
      wMinute:=min;
      wSecond:=ss;
      wMilliseconds:=ms;
    End;
   Result:=SetLocalTime(ADateTime);
   SendMessage(HWND_BROADCAST,WM_TIMECHANGE,0,0) ;
   If Result then ShowMessage('成功改變時間!');
End;


procedure TForm1.btn1Click(Sender: TObject);
begin
SetSystemTime(StrTodateTime('1999-05-08 21:11:11') );
ShowMessage('SetSystemTime');
end;

end.