With marshmallow I can have the alarm time displayed on the edge with night clock. Now with nougat that is no longer the case. And there isn't an option to uninstall updates for AOD.
My Sprint S7 Edge on Nougat still has that option. Under Display. It's right under the toggle for Always On Display. I don't normally used it, but I just turned it on and it's working fine.
Thanks for your reply but are your talking about just using AOD? My night clock works, I no longer see the actual set alarm time on the night clock. Just the clock icon for the alarm.