How to make interactive calendar with months is sheet doc ?

Hello,
I am very new to Excel, yes a bit confused, but already with some tasks to do.
Well in this case I need to work on table that was done by someone else, and try to make interactive months for 2010, in a table where those months would each time automatically change dates (i.e. 30 or 31 days, and keep them in line with week days).. But I am not sure how to do this.
Can anyone help?

Thank you,
Cheers!

Do you mean something like this?

In the cell at the top of the calendar, you can input and date (doesn't have to be the last day of the month, just in the month) and the calendar will update.

I got this from some book, I just forget which one now.