How to activate clock on lock screen? I am using Android 6.0 / Cyanogenmod 13.

Somehow I have deactivated the clock on my lock screen and I can not find the place where to activate it.

Now I have only the unlock pattern there, the place for the clock above is free.

How to activate the clock?
The thing you are searching is known as daydream. You must have changed its setting while doing something in settings. It can be any place but generally found under display setting.