code: def test_datetime_missing(self):
      expected = np.array(
          [
              "nat",
              "2004-12-01T23:59",
              "nat",
              "nat",
              "2013-11-30T04:55",
              "1631-10-15T20:04",
          ],
          dtype="datetime64[m]",
      )
  
      assert_array_equal(self.data["attr_datetime_missing"], expected)
  
imports: import datetime
  import os
  import sys
  from os.path import join
  from io import StringIO
  import numpy
  from numpy.testing import assert_array_almost_equal, assert_array_equal, assert_equal, assert_
  import pytest
  from pytest import raises
  from scipy.io.arff.arffread import loadarff
  from scipy.io.arff.arffread import read_header, ParseArffError
label_desc: Use image node_id 6 for calling the TestDateAttribute obj's underlying member method code with example usage: obj.test_datetime_missing() without return types