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

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

Feel free to search this API through the search bar or the navigation tree in the sidebar.

# rangeSelector.buttons.dataGrouping.firstAnchor

Specifies how the first grouped point is positioned on the xAxis. If firstAnchor and/or lastAnchor are defined, then those options take precedence over anchor for the first and/or last grouped points. Available options:

-`start` places the point at the beginning of the group (e.g. range 00:00:00 - 23:59:59 -> 00:00:00)

-`middle` places the point in the middle of the group (e.g. range 00:00:00 - 23:59:59 -> 12:00:00)

-`end` places the point at the end of the group (e.g. range 00:00:00 - 23:59:59 -> 23:59:59)

-`firstPoint` the first point in the group (e.g. points at 00:13, 00:35, 00:59 -> 00:13)

-`lastPoint` the last point in the group (e.g. points at 00:13, 00:35, 00:59 -> 00:59)