@mwick,
You can set the axisX intervalType as ‘day’ and interval as 1 to achieve your requirement. For formatting the date and time values in toolTip you can set xValueFormatString as per your scenario.
If you are still facing issue, kindly create a JSFiddle reproducing the issue you are facing and share it with us so that we can look into the chart options being used, understand the scenario better and help you resolve.
—
Shashi Ranjan
Team CanvasJS