@floyd6,
how do I set proper values for viewportMinimum/viewportMaximum for dateTime xValueType ?
You can pass the date as date-object or timestamp value to viewportMinimum/viewportMaximum incase of dateTime axis.
If you are still facing any issue, kindly create JSFiddle reproducing the issue and share it with us so that we can look into your code, understand your scenario better and help you out.
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Manoj Mohan
Team CanvasJS