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The IANA time zone folk have deprecated use of a "posixrules" file in the tz database. While for now it's our choice whether to keep supplying one in our own builds, installations built with --with-system-tzdata will soon be needing to cope with that file not being present, at least on some platforms. This causes a problem for the horology test, which expected the nonstandard POSIX zone spec "CST7CDT" to apply pre-2007 US daylight savings rules. That does happen if the posixrules file supplies such information, but otherwise the test produces undesired results. To fix, add an explicit transition date rule that matches 2005 practice. (We could alternatively have switched the test to use some real time zone, but it seems useful to have coverage of this type of zone spec.) While at it, update a documentation example that also relied on "CST7CDT"; use a real-world zone name instead. Also, document why the zone names EST5EDT, CST6CDT, MST7MDT, PST8PDT aren't subject to similar failures when "posixrules" is missing. Back-patch to all supported branches, since the hazard is the same for all. Discussion: https://postgr.es/m/1665379.1592581287@sss.pgh.pa.us |
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