From bbb2e21e14de90ea92fbb286e4f572c8114e75a4 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Tue, 21 Dec 2004 01:02:28 +0000
Subject: [PATCH] I was recently surprised to find that EXTRACT's day of the
week numbering is different than TO_CHAR's ditto. EXTRACT starts at 0==Sunday
while TO_CHAR starts at 1==Sunday.
A suggestion for two documentation notes is attached as a patch to
current CVS HEAD.
Troels Arvin
---
doc/src/sgml/func.sgml | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 15774a3a00a..2de07c04ae8 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -1,5 +1,5 @@
<!--
-$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.230 2004/12/13 18:05:08 petere Exp $
+$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.231 2004/12/21 01:02:28 momjian Exp $
PostgreSQL documentation
-->
@@ -4412,6 +4412,13 @@ substring('foobar' from 'o(.)b') <lineannotation>o</lineannotation>
1230 microseconds = 2.021230 seconds.
</para>
</listitem>
+
+ <listitem>
+ <para><function>to_char</function>'s day of the week numbering
+ (see the 'D' formatting pattern) is different from that of the
+ <function>extract</function> function.
+ </para>
+ </listitem>
</itemizedlist>
</para>
@@ -5146,6 +5153,11 @@ SELECT EXTRACT(DECADE FROM TIMESTAMP '2001-02-16 20:38:40');
SELECT EXTRACT(DOW FROM TIMESTAMP '2001-02-16 20:38:40');
<lineannotation>Result: </lineannotation><computeroutput>5</computeroutput>
</screen>
+ <para>
+ Note that <function>extract</function>'s day of the week numbering is
+ different from that of the <function>to_char</function> function.
+ </para>
+
</listitem>
</varlistentry>
--
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