code: def test_loc_datetime_length_one(self):
      # GH16071
      df = DataFrame(
          columns=["1"],
          index=date_range(
              "2016-10-01T00:00:00", "2016-10-01T23:59:59"
          ),
      )
      result = df.loc[datetime(2016, 10, 1) :]
      tm.assert_frame_equal(result, df)
  
      result = df.loc["2016-10-01T00:00:00":]
      tm.assert_frame_equal(result, df)
  
imports: from datetime import datetime
  import numpy
  import pytest
  from pandas import DataFrame, DatetimeIndex, Index, MultiIndex, Series, Timedelta, Timestamp, date_range
  import pandas._testing
label_desc: Use image node_id 19 for calling the TestSlicing obj's underlying member method code with example usage: obj.test_loc_datetime_length_one() without return types