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I am using Jersey + Jackson to provide REST JSON services layer for my application. The problem I have is that the default Date serialization format looks like that: "CreationDate":1292236718456 At first I thought it is a UNIX timestamp... but it is too long for that. My client-side JS library has problems deserializing this format (it supports a bunch of different date formats but not this one I suppose). I want to change the format so that it can be consumable by my library (to ISO for example). How do I do that... I found a piece of code that could help but... where do I put it as I don't control the Jackson serializer instantiation (Jersey does)? objectMapper.configure( SerializationConfig.Feature.WRITE_DATES_AS_TIMESTAMPS, false); I also found this code for custom JacksonJsonProvider - the question is .. how do I make all my POJO classes use it? @Provider public class MessageBodyWriterJSON extends JacksonJsonProvider { private static final String DF = "yyyy-MM-dd’T'HH:mm:ss.SSSZ"; @Override public boolean isWriteable(Class arg0, Type arg1, Annotation[] arg2, MediaType arg3) { return super.isWriteable(arg0, arg1, arg2, arg3); } @Override public void writeTo(Object target, Class arg1, Type arg2, Annotation[] arg3, MediaType arg4, MultivaluedMap arg5, OutputStream outputStream) throws IOException, WebApplicationException { SimpleDateFormat sdf=new SimpleDateFormat(DF); ObjectMapper om = new ObjectMapper(); om.getDeserializationConfig().setDateFormat(sdf); om.getSerializationConfig().setDateFormat(sdf); try { om.writeValue(outputStream, target); } catch (JsonGenerationException e) { throw e; } catch (JsonMappingException e) { throw e; } catch (IOException e) { th

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