# 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.

# chart.parallelAxes.dateTimeLabelFormats

For a datetime axis, the scale will automatically adjust to the appropriate unit. This member gives the default string representations used for each unit. For intermediate values, different units may be used, for example the `day` unit can be used on midnight and `hour` unit be used for intermediate values on the same axis. For an overview of the replacement codes, see dateFormat.

Defaults to:

    {
        millisecond: '%H:%M:%S.%L',
        second: '%H:%M:%S',
        minute: '%H:%M',
        hour: '%H:%M',
        day: '%e. %b',
        week: '%e. %b',
        month: '%b \'%y',
        year: '%Y'
    }