code: def test_is_all_dates(self):
      # GH 23576
      year_2017 = Interval(
          Timestamp("2017-01-01 00:00:00"),
          Timestamp("2018-01-01 00:00:00"),
      )
      year_2017_index = IntervalIndex([year_2017])
      assert not year_2017_index._is_all_dates
  
imports: from itertools import permutations
  import re
  import numpy
  import pytest
  import pandas
  from pandas import Index, Interval, IntervalIndex, Timedelta, Timestamp, date_range, interval_range, isna, notna, timedelta_range
  import pandas._testing
  import pandas.core.common
label_desc: Use image node_id 34 for calling the TestIntervalIndex obj's underlying member method code with example usage: obj.test_is_all_dates() without return types