@aeva God, Gnome Clocks is so painful. I know Gnome as a whole has a reputation of "what if we brought bad phone UI to computer?" but Gnome Clocks is so out of the "Gnome UI Overton Window" that I'd imagine even the most staunch Gnomers would look at it with disappointment. Not even the worst Android clock apps are that bad.
I'm on KDE at home and their clock app is just... So good. It's no TimeR Machine but it allows multiple simultaneous timers, alarms, the whole shebang with nice clean UI.