xclock(1) on Linux
The text 13c30857e37c, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
analog / digital clock for X
Flags it lists
-
-analog -
-brief -
-chime -
-d -
-digital -
-face -
-help -
-norender -
-padding -
-render -
-sharp -
-strftime -
-twelve -
-twentyfour -
-update -
-utime