I was struggling with this with our 7YOs, who really wanted to understand the calendar and what day and date it is. After trying several ways and methods, I created my own. I’m not sure if it is OK to share here, so I won’t.
I do have a product I sell that teaches the calendar very effectively, or it did for ours and others who have used it have said the same. I also have another product that works on clock faces, but it is part of a larger resource dealing with shapes, adding and subtracting number 0-9, number names and digits zero-one hundred, shape names, color names, etc.
If you click over to my blog, you can see links to these in my right sidebar, and I am having a sale on these at the site for 28% off TODAY.
http://roomforatleastonemore.com