Squid access log can be customized based on your preference.
By default it uses epoch time format.
What we want to do is change it to human readable localtime. To do this you will need to edit squid configuration file.
sudo vi /etc/squid/squid.conf
Add lines below and save it by pressing colon `:` followed by `wg` and enter.
logformat custom %tl.%03tu %>a %Ss/%03>Hs %<st %rm %ru %[un %Sh/%<a %mtaccess_log daemon:/var/log/squid/access.log custom
Restart squid to apply changes.
sudo systemctl restart squid
Further configuration can be found at: squid : logformat configuration directive (squid-cache.org)