# 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.series.dataGrouping.units

An array determining what time intervals the data is allowed to be grouped to. Each array item is an array where the first value is the time unit and the second value another array of allowed multiples.

Defaults to:

    units: [[
        'millisecond', // unit name
        [1, 2, 5, 10, 20, 25, 50, 100, 200, 500] // allowed multiples
    ], [
        'second',
        [1, 2, 5, 10, 15, 30]
    ], [
        'minute',
        [1, 2, 5, 10, 15, 30]
    ], [
        'hour',
        [1, 2, 3, 4, 6, 8, 12]
    ], [
        'day',
        [1]
    ], [
        'week',
        [1]
    ], [
        'month',
        [1, 3, 6]
    ], [
        'year',
        null
    ]]