pandas.Series.to_period

Series.to_period(freq=None, copy=True)

Convert Series from DatetimeIndex to PeriodIndex with desired frequency (inferred from index if not passed)

Parameters:	freq : string, default
Returns:	ts : Series with PeriodIndex

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https://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.Series.to_period.html