I am creating a column chart with Highcharts and I want to stack the values by time. So the xAxis is of type datetime. If the date sent is identical then the stacking is working right but if there is a second of difference, then it's not stacking well and the user experience is weird. A possible solution would be to add a stack range in order to group the similar date values. You can find my Stackoverflow question here with an image and a fiddle: http://stackoverflow.com/questions/39788944/highcharts-column-chart-stacked-not-showing-all-the-values