I need a shell script that can list file in a date range and zip them.

I am looking for a basic shell script(KSH) that can parse the sub directories under a direcory SAY:~/MasterDirectory. ~/MasterDirectory has subdirectories: FOLDER1, FOLDER2, FOLDER3 etc....These subdirectories has files in it. The script should parse each subdirectory and perform the following: 1) Go to one sub directories then find files from three months prior: -- so Todays date - 3 months and then take files from the first of that month through the last of that month. That is: if the script runs on 01-10-2014 it should pick up files 3 months prior from 10-1-2013 through 10-30-2013. 2) Only Zip the files found in the above list and name the zip file titled: 'archive_%SubDirectoryName%[login to view URL]' 3) Copy the zip files from ~/MasterDirectory/Subdirectory to /home/archive directory with the original timestamp and delete the files from the original subdirectory. Once the above step is complete for a given subdirectory....move to the next subdirectory and repeat the same step above. I have SUNOS and have ksh available. Thanks