code: def test_normalize_pre_epoch_dates():
      # GH: 36294
      ser = pd.to_datetime(
          Series(["1969-01-01 09:00:00", "2016-01-01 09:00:00"])
      )
      result = ser.dt.normalize()
      expected = pd.to_datetime(Series(["1969-01-01", "2016-01-01"]))
      tm.assert_series_equal(result, expected)
  
imports: import calendar
  from datetime import date, datetime, time
  import locale
  import unicodedata
  import numpy
  import pytest
  import pytz
  from pandas._libs.tslibs.timezones import maybe_get_tz
  from pandas.errors import SettingWithCopyError
  from pandas.core.dtypes.common import is_integer_dtype, is_list_like
  import pandas
  from pandas import DataFrame, DatetimeIndex, Index, Period, PeriodIndex, Series, TimedeltaIndex, date_range, period_range, timedelta_range
  import pandas._testing
  from pandas.core.arrays import DatetimeArray, PeriodArray, TimedeltaArray
label_desc: Use image node_id 2 for calling a global function with example usage: test_normalize_pre_epoch_dates() without return types