pandas.DatetimeIndex.indexer_at_time
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DatetimeIndex.indexer_at_time(time, asof=False)[source]
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Select values at particular time of day (e.g. 9:30AM) Parameters: time : datetime.time or string Returns: values_at_time : TimeSeries 
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Licensed under the 3-clause BSD License.
    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.DatetimeIndex.indexer_at_time.html