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 a value to parse, second is a boolean indicating use of the UTC time.
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.