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Fix AT TIME ZONE for timestamps without time zones:

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test=> select ('2005-07-20 00:00:00'::timestamp without time zone) at
	time zone 'Europe/Paris';
	        timezone
	------------------------
	 2005-07-19 22:00:00-04

Udpate documentation.
This commit is contained in:
Bruce Momjian
2005-07-22 21:16:15 +00:00
parent 4749e914ae
commit 261026575d
2 changed files with 22 additions and 22 deletions
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18
doc/src/sgml/func.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.268 2005/07/20 16:42:29 momjian Exp $
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.269 2005/07/22 21:16:14 momjian Exp $
PostgreSQL documentation
-->
@ -5693,7 +5693,7 @@ SELECT date_trunc('year', TIMESTAMP '2001-02-16 20:38:40');
<literal><type>timestamp without time zone</type> AT TIME ZONE <replaceable>zone</></literal>
</entry>
<entry><type>timestamp with time zone</type></entry>
<entry>Convert local time in given time zone to UTC</entry>
<entry>Treat given timestamp <emphasis>without time zone</> as located in the specified time zone</entry>
</row>
<row>
@ -5701,7 +5701,7 @@ SELECT date_trunc('year', TIMESTAMP '2001-02-16 20:38:40');
<literal><type>timestamp with time zone</type> AT TIME ZONE <replaceable>zone</></literal>
</entry>
<entry><type>timestamp without time zone</type></entry>
<entry>Convert UTC to local time in given time zone</entry>
<entry>Convert given timestamp <emphasis>with time zone</> to the new time zone</entry>
</row>
<row>
@ -5709,7 +5709,7 @@ SELECT date_trunc('year', TIMESTAMP '2001-02-16 20:38:40');
<literal><type>time with time zone</type> AT TIME ZONE <replaceable>zone</></literal>
</entry>
<entry><type>time with time zone</type></entry>
<entry>Convert local time across time zones</entry>
<entry>Convert given time <emphasis>with time zone</> to the new time zone</entry>
</row>
</tbody>
</tgroup>
@ -5720,7 +5720,8 @@ SELECT date_trunc('year', TIMESTAMP '2001-02-16 20:38:40');
specified either as a text string (e.g., <literal>'PST'</literal>)
or as an interval (e.g., <literal>INTERVAL '-08:00'</literal>).
In the text case, the available zone names are those shown in
<xref linkend="datetime-timezone-set-table">.
<xref linkend="datetime-timezone-set-table">. The time zone can
also be implied using the default time zone for that session.
</para>
<para>
@ -5732,10 +5733,9 @@ SELECT TIMESTAMP '2001-02-16 20:38:40' AT TIME ZONE 'MST';
SELECT TIMESTAMP WITH TIME ZONE '2001-02-16 20:38:40-05' AT TIME ZONE 'MST';
<lineannotation>Result: </lineannotation><computeroutput>2001-02-16 18:38:40</computeroutput>
</screen>
The first example takes a zone-less time stamp and interprets it as MST time
(UTC-7) to produce a UTC time stamp, which is then rotated to PST (UTC-8)
for display. The second example takes a time stamp specified in EST
(UTC-5) and converts it to local time in MST (UTC-7).
The first example takes a time stamp without time zone and interprets it as MST time
(UTC-7), which is then converted to PST (UTC-8) for display. The second example takes
a time stamp specified in EST (UTC-5) and converts it to local time in MST (UTC-7).
</para>
<para>