@grantwray,
You can format axis labels according to your requirements by setting valueFormatString and you can format x-value and y-value shown in index-labels & tooltip by setting xValueFormatString and yValueFormatString.
If you are still facing issue, kindly create JSFiddle reproducing the issue and share it with us so that we can look into code / chart-options used, understand the scenario better and help you resolve.
—
Vishwas R
Team CanvasJS
