This is PongTime, as described by Reddit's user u/DoctorSteve (http://www.reddit.com/r/androiddev/comments/1nmem4/this_app_is_available_on_github_what_can_i_do/)

In a nutshell: PongTime is a Pong Clock that runs on your Android device.

I did not write the original code. I am only offering here in the play store for your convenience.
The app was created by Alex@tinkerblog (http://tinkerlog.com/) a few years ago but he never built and pushed it to the market, so here it is.

Let me know if you find any bugs, I'll gladly fix them as long as that's not too time consuming.

The app is open source, of course: https://github.com/Fusion/PongTime