Since this has gotten a little attention today, here's some more info:

Yes, I did actually do this: https://github.com/tomhazledine?tab=overview&from=2012-12-01&to=2012-12-31

I did it as part of an exploration of ISO Weeks (the GUI I built to do the drawing was a great test-case for rendering a grid of weeks 🤷) https://tomhazledine.com/what-is-an-iso-week/