pandas.DatetimeIndex.get_indexer_for
- 
DatetimeIndex.get_indexer_for(target, **kwargs)[source]
- 
guaranteed return of an indexer even when non-unique This dispatches to get_indexer or get_indexer_nonunique as appropriate 
    © 2008–2012, AQR Capital Management, LLC, Lambda Foundry, Inc. and PyData Development Team
Licensed under the 3-clause BSD License.
    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.DatetimeIndex.get_indexer_for.html