extract information from a log file (last days)

I wrote a bash script to extract a few Items like the IP addresses that makes the most number of connection attempts, now I want to limit all of this within a time range , lets say the last 5 days/hours.

Example of what I wrote :

-G: Which IP address makes the most number of connection attempts?

if [ "$3" = "-G" ]; then 
 I won't write the whole code ! 
echo "IP address makes the most number of connection attempts: \n"
awk '{print $1}' $4 | sort | uniq -c | sort -r -n | awk '{print $2 "\t" $1}' >> Connections 
cat Connections | head -$2 
 rm Connections

now I want to add this Items

-O: Limit it to last number of hours

-P: Limit it to the last number of days

and I run it like this : sh -O -P -G *.log

example log file:

213.46.27.204 - - [15/Sep/2011:22:55:21 +0100]
213.46.27.204 - - [16/Sep/2011:22:55:21 +0100]
213.46.27.204 - - [17/Sep/2011:22:55:21 +0100]
213.46.27.204 - - [18/Sep/2011:22:55:21 +0100]
213.46.27.204 - - [19/Sep/2011:22:55:21 +0100]
please answer just with bash script not python or perl