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;
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