code: def time_datetime_field_daysinmonth(self):
      @test_parallel(num_threads=2)
      def run(dti):
          dti.days_in_month
  
      run(self.dti)
  
imports: from functools import wraps
  import threading
  import numpy
  from pandas import DataFrame, Index, Series, date_range, factorize, read_csv
  from pandas.core.algorithms import take_nd
  from .pandas_vb_common import BaseIO
  from .pandas_vb_common import setup
label_desc: Use image node_id 4 for calling the ParallelDatetimeFields obj's underlying member method code with example usage: obj.time_datetime_field_daysinmonth() without return types