DatetimeIndex.snap()
pandas.DatetimeIndex.snap
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DatetimeIndex.snap(freq='S')
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Snap time stamps to nearest occurring frequency
© 2011–2012 Lambda Foundry, Inc. and PyData Development Team
© 2008–2011 AQR Capital Management, LLC
© 2008–2014 the pandas development team
Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.DatetimeIndex.snap.html