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Please find attached diffs for documentation and simple regression

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tests for the new interval->day changes. I added tests for
justify_hours() and justify_days() to interval.sql, as they take
interval input and produce interval output. If there's a more
appropriate place for them, please let me know.

Michael Glaesemann
This commit is contained in:
Bruce Momjian
2005-07-30 14:52:04 +00:00
parent 5b0bfec414
commit b2b6548c79
5 changed files with 75 additions and 1 deletions
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20
doc/src/sgml/func.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.273 2005/07/29 14:46:56 momjian Exp $
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.274 2005/07/30 14:52:04 momjian Exp $
PostgreSQL documentation
-->
@ -4903,6 +4903,24 @@ SELECT SUBSTRING('XY1234Z', 'Y*?([0-9]{1,3})');
such pair.
</para>
<para>
When adding an <type>interval</type> value to (or subtracting an
<type>interval</type> value from) a <type>timestamp with time zone</type>
value, the days component advances (or decrements) the date of the
<type>timestamp with time zone<type> by the indicated number of days.
Across daylight saving time changes (with the session tiem zone set to a
time zone that recognizes DST), this means <literal>interval '1 day'</literal>
does not necessarily equal <literal>interval '24 hours'</literal>.
For example, with the session time zone set to <literal>CST7CDT</literal>
<literal>timestamp with time zone '2005-04-02 12:00-07' + interval '1 day' </literal>
will produce <literal>timestamp with time zone '2005-04-03 12:00-06'</literal>,
while adding <literal>interval '24 hours'</literal> to the same initial
<type>timestamp with time zone</type> produces
<literal>timestamp with time zone '2005-04-03 13:00-06'</literal>, as there is
a change in daylight saving time at <literal>2005-04-03 02:00</literal> in time zone
<literal>CST7CDT</literal>.
</para>
<table id="operators-datetime-table">
<title>Date/Time Operators</title>