What is the Dual Clock Widget application, how does it work?

According to the introduction of Nova.Labs, Dual Clock Widget is a Tools app on the Android platform. There is currently a 1.1.0 version released on Jun 11, 2017, you can see the details below.

Dual Clock Widget provides a convenient set of two highly-configurable digital clocks for your home screen.

Features include:
- Analog and digital modes
- Set any timezone for each clock
- Customizable clock names, color, and fonts
- Adjustable clock size
- Toggle between showing time & date or time (digital widget only)
- Miscellaneous display options (24H mode, date format, etc)