# 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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# data.dateFormat

Which of the predefined date formats in Date.prototype.dateFormats to use to parse date values. Defaults to a best guess based on what format gives valid and ordered dates. Valid options include: `YYYY/mm/dd`, `dd/mm/YYYY`, `mm/dd/YYYY`, `dd/mm/YY`, `mm/dd/YY`.