title: When a span is created using @NewSpan, timestamp and duration are not sent
body: <p>I am using Spring Cloud Sleuth and Zipkin (via HTTP), by adding spring-cloud-starter-zipkin version 2.0.0.M6 to my dependencies (based on Spring Boot 2.0.0.RC1 and Spring Cloud Finchley M6).</p>
  
  <p>I am using @Newspan annotation to mark a child span around some (expensive) operation. When the span information is sent to Zipkin, I notice that the timestamp and duration of the child span are missing. This leads to a strange rendering on Zipking side. However, when I create the child span by calling tracer#newChild, it works as expected.</p>
  
  <p>Am I missing something? Would this be an issue with Sleuth 2.0.0.M6?</p>
  
  <p>When I run the same code using Spring Boot 1.5.9 and Spring Cloud Edgware SR2, it behaves as expected.</p>
  
  <p>Here's the JSON received on Zipkin side. The span named "child-span-with-annotation" is the one created using @NewSpan, whereas the span "childspanwithnewchild" is created using tracer#newChild.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>[
    {
      "traceId": "b1c2636366c919be",
      "id": "b1c2636366c919be",
      "name": "get",
      "timestamp": 1518495271073166,
      "duration": 862032,
      "annotations": [
        {
          "timestamp": 1518495271073166,
          "value": "sr",
          "endpoint": {
            "serviceName": "sample-sleuth-app",
            "ipv4": "---.---.---.---"
          }
        },
        {
          "timestamp": 1518495271935198,
          "value": "ss",
          "endpoint": {
            "serviceName": "sample-sleuth-app",
            "ipv4": "---.---.---.---"
          }
        }
      ],
      "binaryAnnotations": [
        {
          "key": "ca",
          "value": true,
          "endpoint": {
            "serviceName": "",
            "ipv6": "::1",
            "port": 51982
          }
        },
        {
          "key": "http.path",
          "value": "/hello",
          "endpoint": {
            "serviceName": "sample-sleuth-app",
            "ipv4": "---.---.---.---"
          }
        },
        {
          "key": "mvc.controller.class",
          "value": "MyRestController",
          "endpoint": {
            "serviceName": "sample-sleuth-app",
            "ipv4": "---.---.---.---"
          }
        },
        {
          "key": "mvc.controller.method",
          "value": "sayHello",
          "endpoint": {
            "serviceName": "sample-sleuth-app",
            "ipv4": "---.---.---.---"
          }
        }
      ]
    },
    {
      "traceId": "b1c2636366c919be",
      "id": "14be7ac6eafb0e01",
      "name": "child-span-with-annotation",
      "parentId": "b1c2636366c919be",
      "binaryAnnotations": [
        {
          "key": "class",
          "value": "MyService",
          "endpoint": {
            "serviceName": "sample-sleuth-app",
            "ipv4": "---.---.---.---"
          }
        },
        {
          "key": "method",
          "value": "expensiveOperation1",
          "endpoint": {
            "serviceName": "sample-sleuth-app",
            "ipv4": "---.---.---.---"
          }
        }
      ]
    },
    {
      "traceId": "b1c2636366c919be",
      "id": "b34a4f910f27fdb4",
      "name": "childspanwithnewchild",
      "parentId": "b1c2636366c919be",
      "timestamp": 1518495271479040,
      "duration": 453747,
      "binaryAnnotations": [
        {
          "key": "lc",
          "value": "",
          "endpoint": {
            "serviceName": "sample-sleuth-app",
            "ipv4": "---.---.---.---"
          }
        }
      ]
    }
  ]</code></pre>
  </div>
  </div>
  </p>