Sed or Awk for modify hour in a crontab AIX

Shell Programming and Scripting
1

Hi,

I want to modifiy the hour in the crontab AIX 5.3 for this line:

Input:

00 22 * * * /outillage/script_exploit/bin/SavOffline.ksh > /dev/null 2>&1

Output:

30 20 * * * /outillage/script_exploit/bin/SavOffline.ksh > /dev/null 2>&1

With the awk or sed function through a ssh -q <serveur> <cmd>

Thanks

2 
#!/usr/bin/bash
#modify cron tab file
ssh -q <serveur> <cmd>
cut -f1,2 -d" " /root/cronsample | paste -  /root/crontab  | awk -F" " '{print $1,$2,$5,$6,$7,$8 } '  > /tmp/tmp.txt
cp /tmp/tmp.txt /etc/crontab
rm /tmp/tmp.txt

sorry because i've alitlle experience but i tried to help you as i can
this script i test it in linux ubuntu you can change the path of files