Serialize Date in a JSON REST web service as ISO-8601 string

I have a JAX-RS application using JBoss AS 7.1, and I POST/GET JSON and XML objects which include Dates (java.util.Date): ``` @XmlRootElement @XmlAccessorType(XmlAccessField.FIELD) public class MyObject implements Serializable { @XmlSchemaType(name = "dateTime") private Date date; ... } ``` When I use @Produce("application/xml") on the get method, the objets are serialized as XML and the dates are converted into ISO-8601 strings (e.g. "2012-12-10T14:50:12.123+02:00"). However, if I use @Produce("application/json") on the get method, the dates in the JSON objects are timestamps (e.g. "1355147452530") instead of ISO-8601 strings. How can I do to configure the JAX-RS implementation (RESTEasy) to serialize dates in JSON format as ISO-8601 strings instead of timestamps ? Thank you for your answers. Note: I also tried to use a custom JAX-RS provider to do the JSON serialization for Dates ``` @Provider @Produces(MediaType.APPLICATION_JSON) public class CustomJsonDateProvider implements MessageBodyWriter<Date> { ... } ``` This provider seems to be registered by RESTeasy on JBoss startup: ``` [org.jboss.jaxrs] Adding JAX-RS provider classes: package.CustomJsonDateProvider ... [org.jboss.resteasy.cdi.CdiInjectorFactory] No CDI beans found for class package.CustomJsonDateProvider. Using default ConstructorInjector. ``` but it is never used !