rsync - Dec 2007 - Help needed

Dear all ,
                  I am using this rsync -avz --delete -e ssh
root@192.168.1.39:/home  /home/ to take back up of server .Please tell me
how to specify date in this command so that i only delete 15 days old data
from back up server which doesn't exist on main server now ..

-- 
Regards

Piyush Joshi
9415414376
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