Formater une durée en seconde en (hh:mm:ss)

function ConvertSecondsToTime(iSeconds: Word): TDateTime;
var
hours, min: Word;
begin
hours := Trunc(iSeconds / 3600);
iSeconds := iSeconds - (3600 * Trunc(iSeconds / 3600));
min := Trunc(iSeconds / 60);
iSeconds := iSeconds - (60 * Trunc(iSeconds / 60));
Result := EncodeTime(hours, min, iSeconds, 0);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
label1.Caption := FormatDateTime('hh:mm:ss', ConvertSecondsToTime(5411));
end;