play.api.libs.json.DefaultWrites
Default Serializer org.joda.time.DateTime -> JsNumber(d.getMillis (nb of ms))
Transforms resulting JsValue using Writes[JsValue]
Transforms the resulting JsValue using transformer function
Convert the object into a JsValue
Default Serializer org.joda.time.DateTime -> JsNumber(d.getMillis (nb of ms))