gnome-shell-timer software package provides GNOME Shell extension providing a countdown timer in the top panel, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gnome-shell-timer
gnome-shell-timer is installed in your system.
Make ensure the gnome-shell-timer package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnome-shell-timer *
You will get with gnome-shell-timer package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | GNOME |
| Package | gnome-shell-timer |
| Version | 0.3.12+20140924-5 |
| Description | GNOME Shell extension providing a countdown timer in the top panel |
| Sub Section | gnome |
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