DatetimeIndex.to_period(freq=None)

DatetimeIndex.daysinmonth The number of days in the month

DatetimeIndex.get_indexer(target, method=None, limit=None, tolerance=None)

DatetimeIndex.union(other)

DatetimeIndex.inferred_type

DatetimeIndex.identical(other)

DatetimeIndex.get_duplicates()

DatetimeIndex.asi8

DatetimeIndex.symmetric_difference(other, result_name=None)

DatetimeIndex.is_year_start Logical indicating if first day of year (defined by frequency)