It’s a circular display timer. Similar to the standard Windows 8.1 timer.
Timer time is 10 seconds to 5 minutes can be specified.

Start Timer to display the elapsed time specified overtime hours, as a function of its own.
For example, if you use at the event. Over time and then over time can be displayed on the screen.

The source code for this application is published.
If you want to see the source code, see the following sites.
https://github.com/TakamiChie/WSAcerola