Sunset to Sunset allows you to show your site visitors a message during the Sabbath hours. It will show a banner a set amount of time before notifiying your users of the upcoming closing hours. It also adds a time guard to the edges of the Sabbath allowing the site to close a set amount of time before and open a set amount of time after the Sabbath hours. You can also cofigure this to show only on specific urls.
To install this plugin, search for its package name on the Plugin Store and click “Install”.