How can I mute incoming calls from unknown callers on Android?

Question

Android

Hello.
I am using a smartphone running Android 5.1. It is necessary for me that on this version of android it was possible to implement automatic mute in the time interval I specified (for the night) for all calls from numbers not included in my contact list (on a smartphone).
Maybe there are some automation applications that can solve this problem?
PS Those automators that I used allowed me to turn off the sound at night only for all calls. And I need all the people in my phone book to be able to call me even at night.

Answer 1

Nights Keeper (do not disturb)
https://play.google.com/store/apps/details?id=com....