diff --git a/Resources/config/webservice.xml b/Resources/config/webservice.xml
index e50cdbc..599af0a 100644
--- a/Resources/config/webservice.xml
+++ b/Resources/config/webservice.xml
@@ -76,6 +76,10 @@
                 <argument>float</argument>
                 <argument>xsd:float</argument>
             </call>
+            <call method="addDefaultTypeMapping">
+                <argument>DateTime</argument>
+                <argument>xsd:dateTime</argument>
+            </call>
         </service>
     </services>