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   The 3-Month Vertical Calendar, designed to show the 3 months,    
   starting with either the current month (enter "=TODAY()" in B1 cell),   
    or any month (enter "2001/7" in B1 cell) followed by the next 2 months,    
   is posted. The "Year" sheet is used to enter data for the day.   

Here is the file to download.

   - February 26, 2001 -    
   

      

Reference

How to extract unique values from a list	06/09/07
How to rotate text at an angle
How to validate data using a list
Google & Excel