Re: UCT (Re: pgsql: Update time zone data files to tzdata release2019a.)

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