Ubuntu 17.10, gnome 3.26.1 (xorg)
If I start up my computer, it boots, and presents the login screen. If I do NOT login, but just let it sit for a while, eventually I get a screen that shows me the time. I then have to "swipe" that screen out of the way to see the login screen.
Regarding the screen with the clock that appears if I do not login right away: How do I modify that clock? Currently it is 24 hour format, I would like to change that. (Same for the clock on the top bar on the login screen itself: How does one change that format?)
(Note well: I am NOT talking about the lock screen that appears AFTER I have already logged in.)