add change history information for date-time

[SVN r29540]

index.htm

@@ -290,6 +290,24 @@
                     <code>cref_list_of()</code> for generating anonymous
                     ranges.</li>
 
+                    <li>
+                      <span class="library"><a href=
+                      "doc/html/date_time.html">Date-Time 
+                      Library</a>:</span>
+
+                      <ul>
+                        <li>Added <a href="doc/html/date_time/local_time.html">
+                        local time and time zone classes</a>.</li>
+
+                        <li>Added <a href="doc/html/date_time/date_time_io.html">
+                        format-based Input/Output facets</a>.</li>
+
+                        <li>For a complete list of changes, see the library
+                        <a href="doc/html/date_time/details.html#date_time.changes">
+                        change history</a>.</li>
+                      </ul>
+                    </li>
+
                     <li>
                       <span class="library"><a href=
                       "libs/graph/doc/index.html">Graph Library</a>:</span>