code: def _get_default_dataset_name(existing_names):
      now = datetime.now()
      name = now.strftime("%Y.%m.%d.%H.%M.%S")
      if name in existing_names:
          name = now.strftime("%Y.%m.%d.%H.%M.%S.%f")
  
      return name
  
file_path: fiftyone/fiftyone/migrations/revisions/v0_19_0.py
imports: from datetime import datetime
  import logging
  import string
  from bson import ObjectId
label_desc: Use image node_id 10 for calling a global function with example usage: _get_default_dataset_name(existing_names) and returns: name