Philofaxy
Before to buy one you might want to have a look at the Philofaxy web page
https://philofaxy.blogspot.com
They have a range of diaries, year planners and other organiser pages in a variety of styles and file formats.
I'm a luddite and I like a printed diary to scribble appointments and so on in. So I download the one week per page version and print it out in A5 double sided booklet mode. It works out a lot cheaper than buying a diary