So I recently created this article using the visual editor: https://es.wikipedia.org/wiki/Enmienda_XIII
And as you can see both the "news date" format as well as the "accessed date" is YYYY-MM-DD, since the convention in Spanish Wikipedia is DD-MM-YYYY (see this comment) I believe it would be great if a global change could be done. By the way this seems to be also the case for Dutch Wikipedia (see this discussion)