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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'