Install wmclockmon by entering the following commands in the terminal:
sudo apt update sudo apt install wmclockmon
Description:
Displays a clock in 12/24h mode with alarm mode
wmclockmon displays a clock like wmtime, but with an alarm timer and different styles (14 + user customized ones). There's also a "binary clock" style available.
Homepage: http://tnemeth.free.fr/projets/dockapps.html
Version: 0.8.1-3
Section: universe/x11