unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
procedure Button1Click(Sender: TObject);
  private
{ Private declarations }
  public
{ Public declarations }
end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
function getweek:string;
var
   date:SYSTEMTIME ;
begin
  GetLocalTime(date);
case date.wDayOfWeek of
0:Result := '星期日';
1:Result := '星期一';
2:Result := '星期二';
3:Result := '星期三';
4:Result := '星期四';
5:Result := '星期五';
6:Result := '星期六';
end;

end;

procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage(getweek);
end;

end.