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X axis’s viewportMinimum and viewportMaximum can either be a numeric or a Date Object. The value being passed by you seems to be invalid as it’s neither numeric nor date-time object. Passing viewportMinimum and viewportMaximum with a valid date object according to your requirements should work fine in this case. You can refer to the code snippet below for an example on the same.
viewportMinimum: new Date(2019, 01, 01, 09, 00, 00),
viewportMaximum: new Date(2019, 01, 01, 12, 30, 00)
If you are still facing the issue, kindly create a JSFiddle reproducing the issue you are facing and share it with us so that we can look into the code, understand the scenario better and help you out?