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Clarify exactly when DST-changeover-induced regression test failures

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can be expected to occur.
This commit is contained in:
Tom Lane 2003-04-06 17:47:24 +00:00
parent 3a8f67d091
commit 8cd571b202
1 changed files with 16 additions and 4 deletions
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20
doc/src/sgml/regress.sgml
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@ -1,4 +1,4 @@
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/regress.sgml,v 1.31 2003/03/13 01:30:29 petere Exp $ -->
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/regress.sgml,v 1.32 2003/04/06 17:47:24 tgl Exp $ -->
<chapter id="regress">
<title id="regress-title">Regression Tests</title>
@ -201,14 +201,26 @@ gmake installcheck
<title>Date and time differences</title>
<para>
Some of the queries in the <filename>horology</filename> test will
A few of the queries in the <filename>horology</filename> test will
fail if you run the test on the day of a daylight-saving time
changeover, or the day before or after one. These queries assume
that the intervals between midnight yesterday, midnight today and
changeover, or the day after one. These queries expect that
the intervals between midnight yesterday, midnight today and
midnight tomorrow are exactly twenty-four hours --- which is wrong
if daylight-saving time went into or out of effect meanwhile.
</para>
<note>
<para>
Because USA daylight-saving rules are used, this problem always
occurs on the first Sunday of April, the last Sunday of October,
and their following Mondays, regardless of when daylight-saving
is in effect where you live. Also note that the problem appears or
disappears at midnight Pacific time (UTC-7 or UTC-8), not midnight
your local time. Thus the failure may appear late on Saturday or
persist through much of Tuesday, depending on where you live.
</para>
</note>
<para>
Most of the date and time results are dependent on the time zone
environment. The reference files are generated for time zone