What is the AtomicClock — NTP Time (with widget) application, how does it work?

According to the introduction of T. Partl, AtomicClock — NTP Time (with widget) is a Tools app on the Android platform. There is currently a 1.7.2 version released on Mar 21, 2020, you can see the details below.

Ever wanted to know exact current time to celebrate someone's birthday or New Year's Eve? Or simply to synchronize clocks? AtomicClock provides exact times based on NTP servers which are getting their time directly from atomic clocks!

• current time in correct time format
• analog & digital clock
• choose from different time servers
• customizable widget with time & date
• acoustic ticking
• choose between different clock faces
• switch between local time and UTC, 24-hour and 12-hour clock