The fork of the official Auto Date Plugin is under work. It will be designed for Grav CMS and automatically adds the current date and the current user to frontmatter when creating a new page and saving an existing page via the Admin plugin.
There's not much to this plugin, simply install it and whenever you create a new page via the admin plugin, the current date will be inserted in the frontmatter of the page and show up in the Options -> Publishing Tab. The format of the date is dependent upon the value set in system.yaml
under pages: dateformat: default
and if not set will use H:i d-m-Y
as the date format.