These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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A custom callback function to parse values entered in the input boxes and
return a valid JavaScript time as milliseconds since 1970. The first
argument passed is the value to parse, second is a boolean indicating use
of UTC time. The third is a reference to the time object. Time zone can
be read from time.timezone.
This will only get called for inputs of type text. Since v8.2.3, the
input type is dynamically determined based on the granularity of the
inputDateFormat and the browser support.