I tried to find a nice CLI clock, and I found three, binclock, tty-clock, and Clockywock. Here is a small demonstration of them:

https://i.ytimg.com/vi/MGfs3aRoG7I/hqdefault.jpg

binclock is basically a binary clock, but it can also show you the digital clock. It’s already in Fedora repository. It’s written in Python using ncurses with color.

https://i.ytimg.com/vi/TR24brN5qvU/maxresdefault.jpg

tty-clock is a normal clock. Big clean text display and can bouncing around.

https://i.ytimg.com/vi/KIJV6fyGMBU/maxresdefault.jpg

Clockywock is an analog clock, it also support alarm.

https://i.ytimg.com/vi/5_tdD_Fn1gE/maxresdefault.jpg