I had the idea create a small app with a table where you click a day to highlight it and click it again to remove the highlight so you can mark workdays.
Here is the finished product:
It only took a couple minutes to write the markup, add a simple jQuery function, and style it. The jQuery toggleClass() method makes these type of things super simple, I mean look at the source and see just how easy these are to make.
Here is the working JS/CSS/HTML:
CodePen Link
Just a quick exercise I did for fun, really a trivial task with jQuery, and I had fun making it!
-Alex