pandas.DatetimeIndex.argmax

DatetimeIndex.argmax(axis=None, *args, **kwargs) [source]: Returns the indices of the maximum values along an axis. See numpy.ndarray.argmax for more information on the axis parameter.

See also

numpy.ndarray.argmax

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https://pandas.pydata.org/pandas-docs/version/0.19.2/generated/pandas.DatetimeIndex.argmax.html