Hi, On 2019-06-04 17:20:42 +0100, Andrew Gierth wrote: > fwiw on FreeBSD with no /etc/localtime and no TZ in the environment (and > hence running on UTC), I get "UCT" on both 11.3 and HEAD.
That makes sense. As far as I can tell the reason that 12 sometimes ends up with the proper timezone is that we shortcut the search by: /* * Try to avoid the brute-force search by seeing if we can recognize the * system's timezone setting directly. * * Currently we just check /etc/localtime; there are other conventions for * this, but that seems to be the only one used on enough platforms to be * worth troubling over. */ if (check_system_link_file("/etc/localtime", &tt, resultbuf)) return resultbuf; which is actually a behaviour changing, rather than just an optimization, when there's a lot of equivalently scoring timezones. Greetings, Andres Freund