score:1

Accepted answer

Set pointIntervalUnit to month:

series: [{
    pointStart: Date.UTC(2010, 0, 1),
    pointIntervalUnit: 'month',
    data: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]
}]

Live demo: https://jsfiddle.net/BlackLabel/vezdp4nf/

API Reference: https://api.highcharts.com/highstock/series.column.pointIntervalUnit


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