inputDateParser property

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.

API Docs: https://api.highcharts.com/highcharts/rangeSelector.inputDateParser