class_docstr: Find appropriate date and adjust date.
class_docstr_tok: ["Find","appropriate","date","and","adjust","date","."]
docstr: Return the max calendar datetime
docstr_tok: ["Return","the","max","calendar","datetime"]
code: def max(self) -> pd.Timestamp:
      """
      Return the max calendar datetime
      """
      return max(self.cals)
  
imports: import bisect
  from copy import deepcopy
  import pandas
  from qlib.data import D
  from qlib.utils import hash_args
  from qlib.utils.mod import init_instance_by_config
  from qlib.workflow import R
  from qlib.config import C
  from qlib.log import get_module_logger
  from pymongo import MongoClient
  from pymongo.database import Database
  from typing import Union
  from pathlib import Path
label_desc: Use image node_id 4 for calling the TimeAdjuster obj's underlying member method code with example usage: obj.max() and returns: max