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
year. A day is usually the same as 24
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.