xclock
Display the time in analog or digital form. tldr-pages
On Linux
Linux
Display an analog clock
xclockIdentifyDisplay a 24-hour digital clock with the hour and minute fields only
xclock -digital -briefIdentifyDisplay a digital clock using a strftime format string (see strftime(3))
xclock -digital -strftime formatIdentifyDisplay a 24-hour digital clock with the hour, minute, and second fields that updates every second
xclock -digital -strftime '%H:%M:%S' -update 1IdentifyDisplay a 12-hour digital clock with the hour and minute fields only
xclock -digital -twelve -briefIdentify