# 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.labels.format

A format string for the axis label. The context is available as format string variables. For example, you can use `{text}` to insert the default formatted text. The recommended way of adding units for the label is using `text`, for example `{text} km`.

To add custom numeric or datetime formatting, use `{value}` with formatting, for example `{value:.1f}` or `{value:%Y-%m-%d}`.

See format string for more examples of formatting.

The default value is not specified due to the dynamic nature of the default implementation.