valueType: String

Defines the data type of values in Inputfields. Data type of values are generally determined by x-values of data in StockChart.

Default: Auto Calculated based on data
Options: “number”, “dateTime”
Note 
var stockChart = new CanvasJS.StockChart("container",
{
 .
 .
 rangeSelector: {
   inputFields: {
     valueType: "number",  //Change it to "dateTime"
     .
   }
 },
 .
 .
});
stockChart.render();
Try Editing The Code

  Also See:    

If you have any questions, please feel free to ask in our forums.Ask Question