score:1

Accepted answer

Highstock charts have enabled ordinal options for xAxis by default, which causes inconvenience in your case. You can easily disable that option:

    xAxis: {
        ...,
        ordinal: false
    },

Live demo: https://jsfiddle.net/BlackLabel/x8f05ys3/

API Reference: https://api.highcharts.com/highstock/xAxis.ordinal


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