--- /usr/share/pyshared/trac/prefs/web_ui.py	2010-03-09 14:49:38.000000000 -0800
+++ /usr/share/pyshared/trac/prefs/web_ui.py.new	2010-03-13 10:11:54.000000000 -0800
@@ -36,7 +36,7 @@
     implements(INavigationContributor, IPreferencePanelProvider,
                IRequestHandler, ITemplateProvider)
 
-    _form_fields = ['newsid', 'name', 'email', 'tz', 'accesskeys']
+    _form_fields = ['newsid', 'name', 'email', 'tz', 'format', 'accesskeys']
 
     # INavigationContributor methods
 
--- /usr/share/pyshared/trac/prefs/templates/prefs_datetime.html	2010-03-09 14:49:38.000000000 -0800
+++ /usr/share/pyshared/trac/prefs/templates/prefs_datetime.html.new	2010-03-13 10:11:38.000000000 -0800
@@ -39,5 +39,13 @@
 
     </div>
 
+    <div class="field">
+		<label>Format:
+			<input type="text" id="format" name="format" size="30" value="${settings.session.get('format')}" />
+		</label>
+      <p class="hint">
+		  ISO8601 or a strftime format string
+      </p>
+    </div>
   </body>
 </html>