This is a continuation of my 24 hr clock from 2012. I organically intended to include these circuits, but ran out of time (and PCB board space) to get it done.



This is what it does:



1) It keeps track of the day of the week with 7 separate LEDs. The weekend LEDs are a different color :)

2) It keeps track of the month with 12 separate LEDs

3) It keeps track of the day of the month with 7-segment displays ... with a catch



Here are some caveats:



1) Not every month has 31 days ... I know this, but considering I wanted to do this with only basic logic and not a micro-controller, I was aiming for simplicity. So, the clock is designed to count 31 days for each month and for one more catch, it counts from 00-30. So when it rolls around to 00 it really means its the first of the month.



2) The 4017 chip normally counts to 10, but I needed it to go to 12 to display all the months of the year so two 4017 chips are connected together with an AND gate. You may have to increment the month manually from August to September, but otherwise this is the only "bug"



Lastly, this project gave me an excuse to order a cool custom laser etched case for it from ponoko.com! This is a fairly niche project because it relies on my 24 hr clock I made last year, but it could be done I suppose if it had some other daily input mechanism.