Index: test/src/org/ametys/runtime/test/util/DateConversionTestCase.java
===================================================================
--- test/src/org/ametys/runtime/test/util/DateConversionTestCase.java	(revision 20552)
+++ test/src/org/ametys/runtime/test/util/DateConversionTestCase.java	(working copy)
@@ -15,6 +15,7 @@
  */
 package org.ametys.runtime.test.util;
 
+import java.util.Calendar;
 import java.util.Date;
 
 import junit.framework.TestCase;
@@ -65,4 +66,41 @@
         // Date formatting using current time zone
         assertEquals(ISODateTimeFormat.dateTime().print(new DateTime(dateValue)), ParameterHelper.valueToString(date));
     }
+    
+    /**
+     * Tests value to string conversion for a recent date
+     * @throws Exception if an error occurs.
+     */
+    public void testRecentDate() throws Exception
+    {
+        String expected = ISODateTimeFormat.dateTime().print(new DateTime(2012, 3, 2, 18, 30, 22, 666));
+        
+        Calendar cal = Calendar.getInstance();
+        cal.clear();
+        cal.set(2012, 2, 2, 18, 30, 22);
+        cal.set(Calendar.MILLISECOND, 666);
+        Date date = cal.getTime();
+        
+        // Date parsing
+        String actual = ParameterHelper.valueToString(date);
+        assertEquals(expected, actual);
+    }
+    
+    /**
+     * Tests value to string conversion for date older than 1900
+     * @throws Exception if an error occurs.
+     */
+    public void testOldDate() throws Exception
+    {
+        String expected = ISODateTimeFormat.dateTime().print(new DateTime(1899, 6, 18, 0, 0, 0, 0));
+        
+        Calendar cal = Calendar.getInstance();
+        cal.clear();
+        cal.set(1899, 5, 18, 0, 0, 0);
+        Date date = cal.getTime();
+        
+        // Date parsing
+        String actual = ParameterHelper.valueToString(date);
+        assertEquals(expected, actual);
+    }
 }
Index: main/kernel/src/org/ametys/runtime/util/parameter/ParameterHelper.java
===================================================================
--- main/kernel/src/org/ametys/runtime/util/parameter/ParameterHelper.java	(revision 20552)
+++ main/kernel/src/org/ametys/runtime/util/parameter/ParameterHelper.java	(working copy)
@@ -16,7 +16,9 @@
 package org.ametys.runtime.util.parameter;
 
 import java.io.InputStream;
+import java.util.Calendar;
 import java.util.Date;
+import java.util.GregorianCalendar;
 import java.util.Map;
 
 import org.apache.avalon.framework.logger.Logger;
@@ -24,6 +26,7 @@
 import org.apache.cocoon.xml.AttributesImpl;
 import org.apache.cocoon.xml.XMLUtils;
 import org.joda.time.DateTime;
+import org.joda.time.DateTimeZone;
 import org.joda.time.format.ISODateTimeFormat;
 import org.xml.sax.ContentHandler;
 import org.xml.sax.SAXException;
@@ -38,7 +41,7 @@
 public final class ParameterHelper
 {
     /** Enumeration of supported types */
-    public static enum ParameterType 
+    public static enum ParameterType
     {
         /** boolean values */
         BOOLEAN,
@@ -80,7 +83,7 @@
      * Convert a string containing a type to its value
      * 
      * @param type Name of the type
-     * @return Type 
+     * @return Type
      * @throws IllegalArgumentException if the type is unknown
      */
     public static ParameterType stringToType(String type)
@@ -163,7 +166,7 @@
      * @return String readable by the config bean
      * @throws IllegalArgumentException if the object is a InputStream
      */
-    public static String valueToString(Object value) 
+    public static String valueToString(Object value)
     {
         if (value == null)
         {
@@ -172,7 +175,19 @@
 
         if (value instanceof Date)
         {
-            return ISODateTimeFormat.dateTime().print(new DateTime(value));
+            GregorianCalendar calendar = new GregorianCalendar();
+            calendar.setTime((Date) value);
+            calendar.setTimeZone(DateTimeZone.getDefault().toTimeZone());
+            
+            DateTime date = new DateTime(calendar.get(Calendar.YEAR),
+                                         calendar.get(Calendar.MONTH) + 1,
+                                         calendar.get(Calendar.DAY_OF_MONTH),
+                                         calendar.get(Calendar.HOUR_OF_DAY),
+                                         calendar.get(Calendar.MINUTE),
+                                         calendar.get(Calendar.SECOND),
+                                         calendar.get(Calendar.MILLISECOND));
+            
+            return ISODateTimeFormat.dateTime().print(date);
         }
         
         if (value instanceof InputStream)
@@ -290,7 +305,7 @@
         catch (Exception e)
         {
             throw new ProcessingException("Unable to enumerate entries with enumerator: " + enumerator, e);
-        } 
+        }
 
         XMLUtils.endElement(handler, "enumeration");
     }