Install swisswatch by entering the following commands in the terminal:
sudo apt update sudo apt install swisswatch
Description:
Swiss Railway Clock for the X Window System
Swisswatch is a clock for the X desktop. It relies heavily on resources for configuration, and can be adjusted to a wide range of looks. While it can be configured completely via resources and provides looks for a Botta (SFMoMA) clock style, an oclock emulation and other appearances, it defaults to the style of a Swiss Railway Clock.
Version: 0.6-17
Section: universe/x11