What is the Netherlands Calendar 2017 application, how does it work?

According to the introduction of Agus Haryanto, Netherlands Calendar 2017 is a Productivity app on the Android platform. There is currently a 1.15 version released on Dec 30, 2016, you can see the details below.

Netherland Kalender with public holidays 2017 and 2018
We can replace the image on this calendar by changing the image.
we can set the first day of the week with Sunday or Monday.
Add note with icon birthday, love, task