code: def test_invalid_meas_date(monkeypatch):
      """Test handling of invalid meas_date."""
  
      def _convert_time_bad(date_str, time_str):
          return _convert_time("", "")
  
      monkeypatch.setattr(
          mne.io.ctf.info, "_convert_time", _convert_time_bad
      )
  
      with catch_logging() as log:
          raw = read_raw_ctf(
              ctf_dir / ctf_fname_continuous, verbose=True
          )
      log = log.getvalue()
      assert "No date or time found" in log
      assert raw.info["meas_date"] == datetime.fromtimestamp(
          0, tz=timezone.utc
      )
  
imports: import copy
  import os
  import shutil
  from datetime import datetime, timezone
  from os import path
  import numpy
  import pytest
  from numpy import array_equal
  from numpy.testing import assert_allclose, assert_array_equal
  import mne
  import mne.io.ctf.info
  from mne import create_info, events_from_annotations, make_forward_solution, pick_types, read_annotations
  from mne._fiff.compensator import get_current_comp
  from mne._fiff.constants import FIFF
  from mne._fiff.pick import _picks_to_idx
  from mne.datasets import brainstorm, spm_face, testing
  from mne.io import RawArray, read_raw_ctf, read_raw_fif
  from mne.io.ctf.constants import CTF
  from mne.io.ctf.info import _convert_time
  from mne.io.tests.test_raw import _test_raw_reader
  from mne.tests.test_annotations import _assert_annotations_equal
  from mne.transforms import apply_trans
  from mne.utils import _clean_names, _record_warnings, _stamp_to_dt, catch_logging
label_desc: Use image node_id 11 for calling a global function with example usage: test_invalid_meas_date(monkeypatch) and returns: _convert_time