pandas.DatetimeIndex.strftime
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DatetimeIndex.strftime(date_format)[source]
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Return an array of formatted strings specified by date_format, which supports the same string format as the python standard library. Details of the string format can be found in python string format doc New in version 0.17.0. Parameters: date_format : str date format string (e.g. “%Y-%m-%d”) Returns: ndarray of formatted strings 
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Licensed under the 3-clause BSD License.
    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.DatetimeIndex.strftime.html