unix shell script file date/timestamp

Hi,

In a Unix script (csh) I'm wanting to create an archive script.  

For a certain directory I want to tar and zip all files over 31 days old.

The naming convention I want for my resulting file needs to be something along the lines of :

[earliest_file_date_included]_[latest_file_date_archived].tar.gz

I've sorted out how to do some of this, but need some help with the rest.  For example, I'm using a bit of perl to get the date 31 days ago in YYYYMMDD format and using this to touch (-t) a file and then using a unix find (! -newer) to build a file list of all files I want to archive.

Is there a way to get the date/timestamp of the oldest file in the that list out in YYYYMMDD (or any!) format so that I can use it in my final file name?

As always, any help much appreciated!

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