code: def reference_datetime() -> datetime.datetime:
      return datetime.datetime.utcfromtimestamp(1691600953.443032)
  
imports: import datetime
  from contextlib import nullcontext
  from typing import Any, ContextManager
  import pytest
  from ludwig.utils.date_utils import convert_number_to_datetime
label_desc: Use image node_id 1 for calling a global function with example usage: reference_datetime() and returns: datetime