Is it correct that the calendar named ‘Contact birthdays’ is created atomatically and retrieves the dates from the Contacts app? I ask because I don’t remember whether I created it or not.
These calendar entries all have a notification set up at midnight. In other words, I get notified at midnight for each birthday that is entered in the information of my contacts.
Am I correct? Is it normal?
You are right and that’s normal. So you will never forget an Birthday of your friends 
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I’m sleeping in the night with phone off and when I wake up in.the morning I will get the notification
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The creation of the ‘Contact birthdays’ does not happen on the phone, but on the Nextcloud instance.
This is a known Nextcloud problem and they track this issue at
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I set the Automatic rules for Do not disturb under Sound >> Do not disturb and specify the timings when I do not want to be disturbed.
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Well this is normal, as all calender apps have this functionality inbuilt, but you can change setting from permission level. Just uncheck the contact from permissions.
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Thanks @Gomsi but I actually like this functionality. Only problem for me is the notifiaction.
I can’t believe this issue has been open since 2016 @Markus
Notification are actually pretty easy to remove one by one from within the Calendar app by clicking on each entry. I don’t have hundreds of them.