Use Figlet to make a clock in your shell

figlet_clock.md

Figlet Clock in shell

watch -n1 "date '+%D%n%T' | figlet -k

If you want a different font, just add -f <font-name> after | figlet

If you want to add some color, install lolcat

sudo apt-get install lolcat

then pipe it at the end

watch -n1 "date '+%D%n%T' | f iglet -k | lolcat

Got this from https://www.linux.com/learn/linux-tips-fun-figlet-and-toilet-commands