extracting information from an ls output

[mem16421]

If I run:
ls -la / > output.out

I will have the entire directory structure with file name, date, and sizes.

Is there a way to take the output.out file and add up file space by month? For example I would want it to tell me the total space that all the files on Jan/2005 take up based on last access. So the idea would be to run a script and it creates output like this:

12/2004 34,322
01/2005 432,921
02/2005 2332,120
etc...

I would appreciate and ideas, thanks
Mark

[Santa's little helper]

Just use awk.If you're not familiar with it a google search will give
you introductory tutorials which you can read in 5 minutes
and then you'll be able to do what you want easily.