How to configure Sarg to accept a squid log with readable date time stamp (like 20120-09-21 as opposed to 1285044197.046).
It is not yet possible to freely configure the input log format. It's the next thing I want to add to the development version 2.4.0 but it isn't there yet.
For now, sarg can read the standard squid log format and the extended log format.
Best option might be to create another log file in the squid.conf like:
access_log /var/log/squid/sarg.log extended