Add detailed information on Australian time zones.

doc/src/sgml/datetime.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/datetime.sgml,v 2.5 1999/10/12 13:57:04 thomas Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/datetime.sgml,v 2.6 2000/02/02 16:21:06 thomas Exp $
 Date/time details
 
 $Log: datetime.sgml,v $
+Revision 2.6  2000/02/02 16:21:06  thomas
+Add detailed information on Australian time zones.
+
 Revision 2.5  1999/10/12 13:57:04  thomas
 Sequence of date interpretation not quite right.
 
@@ -422,28 +425,62 @@ Finish initial markup of cvs.sgml, and include it in the programmer's guide
      </tbody>
     </tgroup>
    </table>
-   <note>
-    <para>
-     If the compiler option USE_AUSTRALIAN_RULES is set 
-     then <literal>EST</literal> refers to Australia Eastern Std Time,
-     which has an offset of +10:00 hours from UTC.
   </para>
 
+  <sect2>
+   <title>Australian Time Zones</title>
+
    <para>
     Australian time zones and their naming variants
     account for fully one quarter of all time zones in the 
     <productname>Postgres</productname> time zone lookup table.
+    There are two naming conflicts with common time zones defined
+    in the United States, <literal>CST</literal> and <literal>EST</literal>.
    </para>
-   </note>
+
+   <para>
+    If the compiler option USE_AUSTRALIAN_RULES is set 
+    then <literal>CST</literal> and <literal>EST</literal> will be
+    interpreted using Australian conventions.
+
+    <table tocentry="1">
+     <title><productname>Postgres</productname> Australian Time Zones</title>
+     <titleabbrev>Australian Time Zones</titleabbrev>
+     <tgroup cols="3">
+      <thead>
+       <row>
+	<entry>Time Zone</entry>
+	<entry>Offset from UTC</entry>
+	<entry>Description</entry>
+       </row>
+      </thead>
+      <tbody>
+       <row>
+	<entry>CST</entry>
+	<entry>+10:30</entry>
+	<entry>Australian Central Standard Time</entry>
+       </row>
+       <row>
+	<entry>EST</entry>
+	<entry>+10:00</entry>
+	<entry>Australian Eastern Standard Time</entry>
+       </row>
+      </tbody>
+     </tgroup>
+    </table>
    </para>
+  </sect2>
 
-  <procedure>
+  <sect2>
    <title>Date/Time Input Interpretation</title>
 
    <para>
     The date/time types are all decoded using a common set of routines.
    </para>
 
+   <procedure>
+    <title>Date/Time Input Interpretation</title>
+
     <step>
      <para>
       Break the input string into tokens and categorize each token as
@@ -601,6 +638,7 @@ Finish initial markup of cvs.sgml, and include it in the programmer's guide
      </para>
     </step>
    </procedure>
+  </sect2>
  </sect1>
 
  <sect1>