title: Highstocks : Automaticly cumul datas at the same day
body: <p>It's possible with Highstocks to automaticly calculate the cumul for datas at the same day (Json datas with timestamp) and display one point per day (not showing hours)??</p>
  
  <p>For exemple : obtain only one point of 100 from this timestamps:</p>
  
  <pre><code>    [1248134400000, 30],
      [1248134500000, 30],
      [1248135400000, 40],
  </code></pre>
  
  <p>Thanks!</p>