code: def concat_date_time(date_obj: date, time_obj: time) -> pd.Timestamp:
      return pd.Timestamp(
          datetime(
              date_obj.year,
              month=date_obj.month,
              day=date_obj.day,
              hour=time_obj.hour,
              minute=time_obj.minute,
              second=time_obj.second,
              microsecond=time_obj.microsecond,
          )
      )
  
imports: import bisect
  from datetime import datetime, time, date, timedelta
  from typing import List, Optional, Tuple, Union
  import functools
  import re
  import pandas
  from qlib.config import C
  from qlib.constant import REG_CN, REG_TW, REG_US
label_desc: Use image node_id 5 for calling a global function with example usage: concat_date_time(date_obj, time_obj) and returns: pd