# Welcome to the Highcharts Gantt JS (gantt) Options Reference

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

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# rangeSelector.inputDateParser

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.