# 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.

# plotOptions.series.pointIntervalUnit

On datetime series, this allows for setting the pointInterval to irregular time units, `day`, `month` and `year`. A day is usually the same as 24 hours, but `pointIntervalUnit` also takes the DST crossover into consideration when dealing with local time. Combine this option with `pointInterval` to draw weeks, quarters, 6 months, 10 years etc.

Please note that this options applies to the series data, not the interval of the axis ticks, which is independent.