A few years back I took part in an online design challenge to make a pocket calendar - it was a lot of fun, my designs are here:
https://www.flickr.com/photos/joelanman/albums/7215759450272...
One of them is very similar to this one (Design 2) - I was tidying up someone else's idea. Dunno if David Seah's was related in any way or just people came up with the same idea.