Free and open-source Persian Calendar with Compass/Qibla and Athan, and Dari, Kurdish, Pashto, Azeri, Arabic, Gilaki, English, Turkish, French, Spanish and Japanese support. Supports Gregorian and Islamic calendars support also.

Works with TalkBack accessibility feature of Android also.

https://github.com/persian-calendar/persian-calendar 

Note that permanent date notification bar can be easily disabled from preference. Also it features optional Athan player.

A note about the license of source code: The GPLv3 licencing of the app roughly means you have to release modified source code of the app at leasr for each release and in public, and put its link in an accesible place, have a look at the following for a simple explanation of the license https://tldrlegal.com/license/gnu-general-public-license-v3-(gpl-3)