DatetimeIndex.to_perioddelta()

pandas.DatetimeIndex.to_perioddelta

DatetimeIndex.to_perioddelta(freq)

Calcuates TimedeltaIndex of difference between index values and index converted to PeriodIndex at specified freq. Used for vectorized offsets

New in version 0.17.0.

Parameters:	freq : Period frequency
Returns:	y : TimedeltaIndex

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http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.DatetimeIndex.to_perioddelta.html