BUG: fix wrong error message in deprecated 2D indexing of Series with datetime values

pandas/core/series.py

@@ -901,10 +901,11 @@ def _get_values_tuple(self, key):
     def _get_values(self, indexer):
         try:
             return self._constructor(self._mgr.get_slice(indexer)).__finalize__(self)
-        except ValueError:
+        except (ValueError, AssertionError):
             # mpl compat if we look up e.g. ser[:, np.newaxis];
             #  see tests.series.timeseries.test_mpl_compat_hack
-            return self._values[indexer]
+            # the asarray is needed to avoid returning a 2D DatetimeArray
+            return np.asarray(self._values[indexer])
 
     def _get_value(self, label, takeable: bool = False):
         """

pandas/tests/series/indexing/test_getitem.py

@@ -389,10 +389,19 @@ def test_getitem_generator(string_series):
     tm.assert_series_equal(result2, expected)
 
 
-def test_getitem_ndim_deprecated():
-    s = Series([0, 1])
+@pytest.mark.parametrize(
+    "series",
+    [
+        Series([0, 1]),
+        Series(date_range("2012-01-01", periods=2)),
+        Series(date_range("2012-01-01", periods=2, tz="CET")),
+    ],
+)
+def test_getitem_ndim_deprecated(series):
     with tm.assert_produces_warning(FutureWarning):
-        s[:, None]
+        res = series[:, None]
+
+    assert isinstance(res, np.ndarray)
 
 
 def test_getitem_multilevel_scalar_slice_not_implemented(