title: how to get value in Highcharts dynamic-update live data
body: <p>i want to use Highcharts dynamic-update but get value in db
  get data by json
  result</p>
  
  <pre><code>json this is { data: { categories: [ "2017-03-06 13:54:31.827", "2017-03-06 13:54:24.573", "2017-03-06 13:54:17.383" ], { name: "Press1", data: [ 251384, 251383, 251382 ] }, { name: "Press2", data: [ 621553, 621552, 621551 ]`
  </code></pre>
  
  <p>,</p>
  
  <p>i have 2 series ,i need get value in json where datetime now
  <a href="https://i.stack.imgur.com/J5UGW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/J5UGW.png" alt="this is view result data in highchart"></a> and code above here <a href="http://pastebin.com/ZB1fwQ2K" rel="nofollow noreferrer">mycode</a>
  but data not valid with datetime now !!!  please help</p>