Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

function UpTime: string;
 const
   ticksperday: Integer    = 1000 * 60 * 60 * 24;
   ticksperhour: Integer   = 1000 * 60 * 60;
   ticksperminute: Integer = 1000 * 60;
   tickspersecond: Integer = 1000;
 var
   t:          Longword;
   d, h, m, s: Integer;
 begin
   t := GetTickCount;

   d := t div ticksperday;
   Dec(t, d * ticksperday);

   h := t div ticksperhour;
   Dec(t, h * ticksperhour);

   m := t div ticksperminute;
   Dec(t, m * ticksperminute);

   s := t div tickspersecond;

   Result := 'Uptime: ' + IntToStr(d) + ' Days ' + IntToStr(h) + ' Hours ' + IntToStr(m) +
     ' Minutes ' + IntToStr(s) + ' Seconds';
 end;


 procedure TForm1.Button1Click(Sender: TObject);
 begin
   label1.Caption := UpTime;
 end;