Same multiple workbooks and a master workbook.

I am looking for a code or a way to select multiple workbooks that contain all the same data and all the information goes into the Master workbooks. The Format has the main where it compiles all the data from the month and then the days of the month 1-31. I tried looking and couldn't find anything to help me. Any help would be appreciated. Here is how my workbook looks. Here is an example of one but have multiple worksbooks exactly the same.