code: def _convert_timestamp(s):
      """Adapt text timestamp to datetime"""
      return ensure_timezone(dateutil_parse(s))
  
imports: import json
  import os
  from datetime import datetime
  from dateutil.parser import parse
  from tornado import ioloop
  from traitlets import Dict, Instance, List, Unicode
  from ..util import ensure_timezone, extract_dates
  from .dictdb import BaseDB
label_desc: Use image node_id 6 for calling a global function with example usage: _convert_timestamp(s) and returns: ensure_timezone