Designed by Patrick Ng it's an alternative form of time management and he originally designed it for the Midori Traveler's Notebook. This time last year I used my large Midori notebook as inspiration for a pocket version (with the added advantage that it would take moleskine cahiers/ field notes as well as Midori and Paperchase passport sized notebooks).
I've been using it all year - can't imagine using anything else and it's holding up pretty well. (I'm also still using the larger version as a sketchbook). The Midori passport sized accessories fit so I've added a pen holder and clear pockets. It takes up to 4 notebooks and last year one of them was a diary. The diary covers all areas of work - but then I also have space for a separate notebook for each area which is perfect.
I thought about using a Midori or Moleskine cahier diary this year - but to be honest I don't really need a traditional diary - most of my work is done from home and I have a big wall diary which I use for appointments. I also don't like wasting paper and lots of pages in my diary only have a few words (whilst my notebooks are bursting).The chronodex seems ideal as it enables me to track hours spent - and the fact it is very intuitive and visual is a big advantage (and I get to colour code!). The pdf on patrick's site was for the larger Midori and I did think about adapting it into a smaller sized one (printing and stapling it into a book form). However, I find the whole diary format quite restricting - some days I make lots of notes - other days I don't so I wanted something a bit more flexible. In the end I printed the chronodex on stickers - so I can add it to my notebooks as and when I need to.I've been testing it out over the last few days - it looks a bit odd but it is actually really easy to use. I have a feeling I shall be using it for some time....