# JS API Reference

# Welcome to the Highcharts JS Options Reference

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

Feel free to search this API through the search bar or the navigation tree in the sidebar.

# 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`.