Merage the Excel file

Hi,
I have the Excel files with Every Business date. it's approximately 20 files for each month. I want put it all the files in one excel file(Monthly File) with Business date has Column. It' happen each month.

Forexample:

List of files(Input): 01/02/2008,02/02/2008,03/02/2008
OutPut like: 01-Feb-2008
Please help me on this.