# Welcome to the Highcharts Gantt JS (gantt) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

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# navigator.xAxis.max

The maximum value of the axis. If `undefined`, the max value is automatically calculated.

If a datetime string is passed, it is parsed into epoch time according to the time zone given in time.timezone.

If the endOnTick option is true, the `max` value might be rounded up.

If a tickAmount is set, the axis may be extended beyond the set max in order to reach the given number of ticks. The same may happen in a chart with multiple axes, determined by chart. alignTicks, where a `tickAmount` is applied internally.