added blurb about date-time changes for 1.31 release

[SVN r20610]

index.htm

@@ -145,6 +145,11 @@
                                   functions, including improved checking for 
                                   directory and file name portability.</li>
                                   <li><a href="libs/random/index.html">Random Number Library</a>: interface changed to C++ library <a href="libs/random/wg21-proposal.html">TR proposal</a>, from Jens Maurer.</li>
+                                  <li><a href="libs/date_time/doc/index.html">Date Time Library:</a> A 
+                                      whole host of bug fixes, new features, and documentation 
+                                      improvements.  See 
+                                      <a href="libs/date_time/doc/Changes.html">Date Time Change History</a>                                      for details. 
+                                  </li>
                                 </ul>
                                 
                                 <p>August 19, 2003 - Version 1.30.2 (bugfix release)</p>