Shell Programming and Scripting

i have a k shell script that grep less than certain modified date
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#!/bin/ksh

for i in *
do

day=`ls -ltr | grep $i | tr -s " " | cut -d " " -f6-7 | awk 'substr($0,7,4)substr($0,1,5)substr($0,11)<"Feb 1"' `
echo $day
done
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if suppose i want to grep only those date less than Feb 1 2007,how to put this logic in ? also the above script shows me only the o/p as

Dec 25
dec 24

i have jan files also,but it is not showing up

help me

From your use of the ls command, it looks like you are trying to find files whose date is earlier than Feb 1, 2007.

Why not just use the find command with the appropriate options?

i really not an expert in unix shell.....

so basically can u tell me in r best possible way how to use find command here. help me in this