title: How to specific name (tooltip) for each bar in Highchart
body: <p>How can I specific tooltip title and sub title for each bar in drilldown Highchart ?<br>
  The image below describes what I want to do. The time will be the current time which is local time and not just only one bar but I want to use in every bar in my graph, even the bar after drill down.<br><br></p>
  
  <p>This is the code that applied in every bar in my chart.</p>
  
  <pre><code>tooltip: {
      headerFormat: '&lt;span style="font-size:11px"&gt;Time and Date&lt;/span&gt;&lt;br&gt;',
      pointFormat: '&lt;span style="color:{point.color}"&gt;{point.name}&lt;/span&gt;: &lt;b&gt;{point.y:.0f} &lt;/b&gt;watt(s)&lt;br/&gt;'
  },
  </code></pre>
  
  <p>Please suggest me how to do it. Thank you</p>
  
  <p><a href="https://i.stack.imgur.com/TvDsM.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TvDsM.jpg" alt="enter image description here"></a></p>