tty-clock(1) on Linux
The text 9abfe8aff0d3, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it.
a terminal digital clock
Flags it lists
-
-B -
-C -
-D -
-S -
-T -
-a -
-b -
-c -
-d -
-f -
-h -
-i -
-n -
-r -
-s -
-t -
-u -
-v -
-x