IdDateTimeStamp gives strange result

[jollytall]

I might have missed something, but tried a very simple code:

procedure TForm1.Button1Click(Sender: TObject);
  begin
  IdDateTimeStamp1.SetFromTDateTime(Now);
  memo1.lines.add(DateTimeToStr(Now));
  memo1.lines.add(IdDateTimeStamp1.AsISO8601Calendar);
  end;


and got the result:

9-7-19 12:06:56
2020-8-10T12:06:56,

i.e. the Year, the Month and the Day are all +1 compared to the real one. I tried other dates and always this offset.

Any idea?

I use Debian 9, Gnome 3.22.2, Lazarus 2.0.2., FPC 3.0.4, on 64 bit.