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Commit6b77778

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Mention DST boundaries as a possible cause of regress test failure.
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‎doc/src/sgml/regress.sgml

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@@ -313,6 +313,15 @@ The runtime path is /usr/local/pgsql (other paths are possible).
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environment variable PGTZ to PST8PDT to ensure proper results.
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</Para>
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<Para>
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Some of the queries in the "timestamp" test will fail if you run
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the test on the day of a daylight-savings time changeover, or the
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day before or after one. These queries assume that the intervals
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between midnight yesterday, midnight today and midnight tomorrow are
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exactly twenty-four hours ... which is wrong if daylight-savings time
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went into or out of effect meanwhile.
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</Para>
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<Para>
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There appear to be some systems which do not accept the recommended syntax
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for explicitly setting the local time zone rules; you may need to use

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