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Add support for fractional seconds in datetime formatting #1482

@ma-galan

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@ma-galan

When formatting datetime axes in lets-plot, the finest resolution supported appears to be seconds. In my use case, I sometimes need to display 3 decimal places for sub-second precision on the x-axis labels and/or in hover tooltips.

Currently, the most precise format I can use is: scale_x_datetime(format="%H:%M:%S")

I think it would be very useful to support sub-second formatting, for example (or a similar syntax that exposes milliseconds/microseconds): date_format = "%Y-%m-%d %H:%M:%S.%3f"

I may be missing something, but I haven't found a way to achieve this. Any guidance or suggestions would be appreciated.

Thanks.

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