tty-clock(1) on Linux
The text 2111bd9a7bb4, as Debian 8 (Jessie) shipped it.
a terminal digital clock
Flags it lists
-
-C -
-S -
-T -
-b -
-c -
-d -
-f -
-h -
-i -
-n -
-r -
-s -
-t -
-v