Install xfce4-timer-plugin by entering the following commands in the terminal:
sudo apt update sudo apt install xfce4-timer-plugin
Description:
timer plugin for Xfce panel
With this plugin you can add timers (alarm or countdown) to your Xfce panel. You can display a warning window and/or run a custom command when alarm rings, repeat alarms etc. The timer progress is shown as a progress bar in the Xfce panel, lasting time displayed on tooltip.
Version: 1.6.0-1build1
Section: universe/x11