Install wmcalclock by entering the following commands in the terminal:
sudo apt update sudo apt install wmcalclock
Description:
dock.app which simply tells time and date
wmCalClock is a dock app specifically written for WindowMaker, but will work with other window managers. It features antialiased text display with the ability to choose between different fonts and colors. wmCalclock supports 12, 24 and 30 hour time, Greenwich time, Greenwich Mean Sidereal Time, and Local Sidereal Time.
Version: 1.25-16
Section: universe/x11