code: def get_start_dttm(annotation_id: int) -> datetime:
      return datetime(1990 + annotation_id, 1, 1)
  
file_path: superset/tests/integration_tests/annotation_layers/fixtures.py
imports: import pytest
  from datetime import datetime
  from typing import Optional
  from superset import db
  from superset.models.annotations import Annotation, AnnotationLayer
  from tests.integration_tests.test_app import app
label_desc: Use image node_id 1 for calling a global function with example usage: get_start_dttm(annotation_id) and returns: datetime