Muji Chronotebook, currently the best paper day planner.
It’s the simplest manifestation of what a day planner is all about: time on paper. The clocks occupy a small amount of space on the page and rest is completely flexible. You can write in your own dates at the top of each page, and you can treat the rest of the space like a blank page.
I'll be heading to the my local Muji store later to get my own.