I agree with 0mak0. It looks any diary you could buy in a shop.

Look closely. The upper left-hand corner of the page is beveled. I do the same thing. The length along the top is about 2 cm and down the side is about 1 cm. Don’t cut so far down that you cut off the top of the date numbers. The advantage is that you can immediately turn to the current week (page) without using the elastic ribbon. After you have established a pattern, you can use the previous edge as a guide for your scissors. Sometimes I pencil in the edge and cut along the line I drew. In the meantime you can simply bend up the corner.

You could put another tab at the bottom corner if you wanted to go directly to one of the front pages. Two tabs could also be created from the back if desired.