code: def _utcnow() -> str:
      """string iso format in UTC"""
      return datetime.datetime.utcnow().strftime("%Y-%m-%dT%H-%M-%SZ")
  
file_path: modelkit/modelkit/assets/versioning/simple_date.py
imports: import datetime
  import re
  import typing
  from modelkit.assets import errors
  from modelkit.assets.versioning import versioning
label_desc: Use image node_id 1 for calling a global function with example usage: _utcnow() and returns: datetime