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