# 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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# plotOptions.series.pointStart

If no x values are given for the points in a series, `pointStart` defines on what value to start. For example, if a series contains one yearly value starting from 1945, set `pointStart` to 1945.

The `pointStart` setting can be a number, or a datetime string that is parsed according to the `time.timezone` setting.

If combined with `relativeXValue`, an x value can be set on each point. The x value from the point options is multiplied by `pointInterval` and added to `pointStart` to produce a modified x value.