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-rw-r--r--doc/src/sgml/func.sgml7
1 files changed, 4 insertions, 3 deletions
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 52049e7a738..689cd34e93b 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -1,4 +1,4 @@
-<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.505 2010/02/19 00:15:25 momjian Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.506 2010/02/23 16:14:25 momjian Exp $ -->
<chapter id="functions">
<title>Functions and Operators</title>
@@ -5317,8 +5317,9 @@ SELECT SUBSTRING('XY1234Z', 'Y*?([0-9]{1,3})');
<listitem>
<para>
<function>to_char(interval)</function> formats <literal>HH</> and
- <literal>HH12</> as hours in a single day, while <literal>HH24</>
- can output hours exceeding a single day, e.g., &gt;24.
+ <literal>HH12</> as shown on a 12-hour clock, i.e. zero hours
+ and 36 hours output as <literal>12</>, while <literal>HH24</>
+ outputs the full hour value, which can exceed 23 for intervals.
</para>
</listitem>