code: def dta_dti(self, unit, dtype):
      tz = getattr(dtype, "tz", None)
  
      dti = pd.date_range("2016-01-01", periods=55, freq="D", tz=tz)
      if tz is None:
          arr = np.asarray(dti).astype(f"M8[{unit}]")
      else:
          arr = np.asarray(
              dti.tz_convert("UTC").tz_localize(None)
          ).astype(f"M8[{unit}]")
  
      dta = DatetimeArray._simple_new(arr, dtype=dtype)
      return dta, dti
  
imports: from __future__ import annotations
  from datetime import timedelta
  import operator
  import numpy
  import pytest
  from pandas._libs.tslibs import tz_compare
  from pandas.core.dtypes.dtypes import DatetimeTZDtype
  import pandas
  import pandas._testing
  from pandas.core.arrays import DatetimeArray, TimedeltaArray
label_desc: Use image node_id 3 for calling the TestNonNano obj's underlying member method code with example usage: obj.dta_dti(unit, dtype) and returns: dta,  dti