code: def test_serialize_via_json_timestamp(self):
      timestamp_obj = pd.Timestamp(2020, 1, 1)
      assert isinstance(timestamp_obj, pd.Timestamp)
      result = json.dumps(serialize_json_safe(timestamp_obj))
      assert result is not None
      assert "2020" in result
  
      timestamp_obj_array = np.array([pd.Timestamp(2020, 1, 1)])
      result = json.dumps(serialize_json_safe(timestamp_obj_array))
      assert result is not None
      assert "2020" in result
  
imports: import datetime
  import json
  import numpy
  import pandas
  import pytest
  from scipy.sparse import csr_matrix
  from raiutils.data_processing import convert_to_list, convert_to_string_list_dict, serialize_json_safe
label_desc: Use image node_id 10 for calling the TestSerializationUtilities obj's underlying member method code with example usage: obj.test_serialize_via_json_timestamp() without return types