DataFrame.to_period(freq=None, axis=0, copy=True)

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

Parameters :

freq : string, default

axis : {0, 1}, default 0

The axis to convert (the index by default)

copy : boolean, default True

If False then underlying input data is not copied

Returns :

ts : TimeSeries with PeriodIndex