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This patch makes it possible to use the full set of timezones when doing

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"AT TIME ZONE", and not just the shorlist previously available. For
example:

SELECT CURRENT_TIMESTAMP AT TIME ZONE 'Europe/London';

works fine now. It will also obey whatever DST rules were in effect at
just that date, which the previous implementation did not.

It also supports the AT TIME ZONE on the timetz datatype. The whole
handling of DST is a bit bogus there, so I chose to make it use whatever
DST rules are in effect at the time of executig the query. not sure if
anybody is actuallyi *using* timetz though, it seems pretty
unpredictable just because of this...

Magnus Hagander
This commit is contained in:
Bruce Momjian
2005-06-15 00:34:11 +00:00
parent 5955945828
commit 0851a6fbc7
9 changed files with 145 additions and 129 deletions
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8
doc/src/sgml/datetime.sgml
View File

@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/datetime.sgml,v 2.45 2005/01/09 18:58:10 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/datetime.sgml,v 2.46 2005/06/15 00:34:08 momjian Exp $
-->
<appendix id="datetime-appendix">
@ -990,7 +990,9 @@ $PostgreSQL: pgsql/doc/src/sgml/datetime.sgml,v 2.45 2005/01/09 18:58:10 tgl Exp
<para>
<xref linkend="datetime-timezone-set-table"> shows the time zone
names recognized by <productname>PostgreSQL</productname> as valid
settings for the <xref linkend="guc-timezone"> parameter. Note that
settings for the <xref linkend="guc-timezone"> parameter, and as
parameters to the <literal>AT TIME ZONE function</> (see
<xref linkend="functions-datetime-zoneconvert">). Note that
these names are conceptually as well as practically different from
the names shown in <xref linkend="datetime-timezone-input-table">:
most of these names imply a local daylight-savings time rule, whereas
@ -1004,7 +1006,7 @@ $PostgreSQL: pgsql/doc/src/sgml/datetime.sgml,v 2.45 2005/01/09 18:58:10 tgl Exp
</para>
<table id="datetime-timezone-set-table">
<title>Time Zone Names for Setting <varname>timezone</></title>
<title>Time Zone Names for Setting <varname>timezone</> and <literal>AT TIME ZONE</></title>
<tgroup cols="1">
<thead>
<row>

7
doc/src/sgml/func.sgml
View File

@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.256 2005/06/14 23:47:39 momjian Exp $
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.257 2005/06/15 00:34:08 momjian Exp $
PostgreSQL documentation
-->
@ -5679,10 +5679,7 @@ 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-input-table">. (It would be useful
to support the more general names shown in
<xref linkend="datetime-timezone-set-table">, but this is not yet
implemented.)
<xref linkend="datetime-timezone-set-table">.
</para>
<para>