For reference, just because it took me a while to get the syntax right, plus https://bugs.squid-cache.org/show_bug.cgi?id=4905 made me scratch my head a bit wondering why it wasn't working when I used "squid" instead of another name:
logformat custom-squid %tg{%F %H:%M:%S %z} %6tr %>a %Ss/%03>Hs %<st %rm %ru %[un %Sh/%<a %mt access_log daemon:/var/log/squid/access.log custom-squid Will yield: 2020-04-22 13:27:14 +0000 18 127.0.0.1 TCP_REFRESH_UNMODIFIED/200 265270 GET http://br.archive.ubuntu.com/ubuntu/dists/focal/InRelease - FIRSTUP_PARENT/10.10.1.6 - ** Bug watch added: Squid Bugzilla #4905 http://bugs.squid-cache.org/show_bug.cgi?id=4905 -- You received this bug notification because you are a member of Ubuntu Server, which is subscribed to squid in Ubuntu. https://bugs.launchpad.net/bugs/1780341 Title: squid should default to more human friendly timestamps To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/squid/+bug/1780341/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs