# 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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# lang.weekdays

An array containing the weekday names. Corresponds to the `%A` format in `Highcharts.dateFormat()`. Defaults to 'undefined', meaning the default weekday names are used according to the `lang.locale` or browser settings.