title: highcharts datetime axis, how to comput correct timestamp?
body: <p>Let say I want to draw a series where the first point represents the time 11:30 of november 5 2013. I want the time 11:30 to be the same if I look my chart with a browser in a different timezone. Hence I want useUTC=true. Now, how do I compute the value (milliseconds) to give to highcharts?</p>
  
  <p>I tried with this python code:</p>
  
  <pre><code>&gt;&gt;&gt; import datetime,time
  &gt;&gt;&gt; t=datetime.datetime(2013,11,5,11,30,00)
  &gt;&gt;&gt; time.mktime(t.timetuple())*1000
  1383647400000.0
  </code></pre>
  
  <p>But if I plug the value 1383647400000.0 in highcharts I obtain a point with time 10:30 instead of 11:30. </p>
  
  <p>Here is a the code reproducing the malfunctioning: <a href="http://jsfiddle.net/2BffA/6/" rel="nofollow">http://jsfiddle.net/2BffA/6/</a></p>
  
  <p>What am I doing wrong?</p>