Group On Added

<response>
  <lst name="responseHeader">
    <int name="status">0</int>
    <int name="QTime">103</int>
    <lst name="params">
      <str name="q">*:*</str>
      <str name="group.func">rint(div(ms(added), 86400000))</str>
      <str name="group.field">added</str>
      <str name="group">true</str>
      <str name="rows">0</str>
    </lst>
  </lst>
  <lst name="grouped">
    <lst name="added">
      <int name="matches">5331462</int>
      <arr name="groups"/>
    </lst>
    <lst name="rint(div(ms(added), 86400000))">
      <int name="matches">5331462</int>
      <arr name="groups"/>
    </lst>
  </lst>
</response>