Accepted answer

Unfortunately, Highcharts does not have the default option to export data in milliseconds (timestamp). However, it can be done easily by wrapping Highcharts.Chart.prototype.getDataRows method and map the data array which is used for export.

(function(H) {
  H.wrap(H.Chart.prototype, 'getDataRows', function(proceed, multiLevelHeaders) {
    var rows =, multiLevelHeaders);

    rows = => {
      if (row.x) {
        row[0] = row.x;
      return row;

    return rows;


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