unit Unit1;    interface    uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;    type
  TForm1 = class(TForm)
    Button1: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;    var
  Form1: TForm1;
  DTStr: String; //設定一個時間字串    implementation    {$R *.DFM}    procedure TForm1.Button1Click(Sender: TObject);
begin
 //若時間字串空白,則抓取系統時間
       //第二次以後按下button時, 由於時間字串不是空白,所以時間就被定住了         
 
 if DTStr=''  then
  DTStr:=DateTimeToStr(Now);
  Label1.Caption:=DTStr;
 end;
end;    procedure TForm1.FormCreate(Sender: TObject);
begin
 //Form 開啟時將時間字串設為空白
 DTStr:='';
end;    end.