Yiibooster Highchart Widget, How To Use With Date Field

I am using yiibooster extension. This extension have Grid/Chart component and tbhighchart widget. Both of them is wrapper of highchart as I understand.

I have three columns in my db query.

• Hospital
  
• Date
  
• Patient count

What I want to do is y axis would be Patient count column, x axis would be Date column and Hospital as categories will be displayed as column in chart.
I tried many methods, but don't understand completely.

Any help be appreciated.