+You can use `TickFormat` to format the tick label. The formatting rule uses the d3 formatting mini-languages which are very similar to those in Python. See [here](https://github.com/d3/d3-3.x-api-reference/blob/master/Formatting.md#d3_format) for numbers and [here](https://github.com/d3/d3-time-format#locale_format) for dates. Plotly adds two items to d3's date formatter: "%h" for half of the year as a decimal number as well as "%{n}f" for fractional seconds with n digits. For example, "2016-10-13 09:15:23.456" with TickFormat "%H~%M~%S.%2f" would display "09~15~23.46".
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