diff --git a/pandas/core/arrays/period.py b/pandas/core/arrays/period.py
index f14ba8a2a0de7..13c7c012ee866 100644
--- a/pandas/core/arrays/period.py
+++ b/pandas/core/arrays/period.py
@@ -833,7 +833,7 @@ def dt64arr_to_periodarr(data, freq, tz=None):
 
     if not (is_datetime64_ns_dtype(data.dtype) or
             is_datetime64tz_dtype(data.dtype)):
-        raise ValueError('Wrong dtype: %s' % data.dtype)
+        raise ValueError('Wrong dtype: {dtype}'.format(dtype=data.dtype))
 
     if isinstance(data, ABCIndexClass):
         if freq is None:
diff --git a/pandas/core/indexes/datetimes.py b/pandas/core/indexes/datetimes.py
index f76c77a5d3944..87af732af041b 100644
--- a/pandas/core/indexes/datetimes.py
+++ b/pandas/core/indexes/datetimes.py
@@ -1437,11 +1437,11 @@ def date_range(start=None, end=None, periods=None, freq=None, tz=None,
     if freq is None and com._any_none(periods, start, end):
         freq = 'D'
 
-    result = DatetimeArray._generate_range(
+    dtarr = DatetimeArray._generate_range(
         start=start, end=end, periods=periods,
         freq=freq, tz=tz, normalize=normalize,
         closed=closed, **kwargs)
-    return DatetimeIndex(result, name=name)
+    return DatetimeIndex(dtarr, name=name)
 
 
 def bdate_range(start=None, end=None, periods=None, freq='B', tz=None,
diff --git a/pandas/core/indexes/timedeltas.py b/pandas/core/indexes/timedeltas.py
index 53a451aec0f5c..2406fe9943892 100644
--- a/pandas/core/indexes/timedeltas.py
+++ b/pandas/core/indexes/timedeltas.py
@@ -169,6 +169,8 @@ def _join_i8_wrapper(joinf, **kwargs):
     _object_ops = TimedeltaArray._object_ops
     _field_ops = TimedeltaArray._field_ops
     _datetimelike_ops = TimedeltaArray._datetimelike_ops
+    _datetimelike_methods = TimedeltaArray._datetimelike_methods
+    _other_ops = TimedeltaArray._other_ops
 
     # -------------------------------------------------------------------
     # Constructors
@@ -790,6 +792,6 @@ def timedelta_range(start=None, end=None, periods=None, freq=None,
         freq = 'D'
 
     freq, freq_infer = dtl.maybe_infer_freq(freq)
-    result = TimedeltaArray._generate_range(start, end, periods, freq,
-                                            closed=closed)
-    return TimedeltaIndex(result, name=name)
+    tdarr = TimedeltaArray._generate_range(start, end, periods, freq,
+                                           closed=closed)
+    return TimedeltaIndex(tdarr, name=name)
diff --git a/pandas/tests/arrays/test_timedeltas.py b/pandas/tests/arrays/test_timedeltas.py
index d418d8376b71a..30ca5828d0ba1 100644
--- a/pandas/tests/arrays/test_timedeltas.py
+++ b/pandas/tests/arrays/test_timedeltas.py
@@ -37,6 +37,7 @@ def test_copy(self):
 
         arr = TimedeltaArray(data, copy=True)
         assert arr._data is not data
+        assert arr._data.base is not data
 
 
 class TestTimedeltaArray(object):
diff --git a/pandas/tests/indexes/datetimes/test_construction.py b/pandas/tests/indexes/datetimes/test_construction.py
index 173b5e5733e96..bca99d27bda56 100644
--- a/pandas/tests/indexes/datetimes/test_construction.py
+++ b/pandas/tests/indexes/datetimes/test_construction.py
@@ -7,8 +7,7 @@
 import pytest
 import pytz
 
-from pandas._libs.tslib import OutOfBoundsDatetime
-from pandas._libs.tslibs import conversion
+from pandas._libs.tslibs import OutOfBoundsDatetime, conversion
 
 import pandas as pd
 from pandas import (
diff --git a/pandas/tests/indexes/datetimes/test_tools.py b/pandas/tests/indexes/datetimes/test_tools.py
index c24c1025ea63c..13f9648d46216 100644
--- a/pandas/tests/indexes/datetimes/test_tools.py
+++ b/pandas/tests/indexes/datetimes/test_tools.py
@@ -24,6 +24,7 @@
 from pandas import (
     DataFrame, DatetimeIndex, Index, NaT, Series, Timestamp, compat,
     date_range, isna, to_datetime)
+from pandas.core.arrays import DatetimeArrayMixin as DatetimeArray
 from pandas.core.tools import datetimes as tools
 from pandas.util import testing as tm
 from pandas.util.testing import assert_series_equal
@@ -246,6 +247,18 @@ def test_to_datetime_parse_timezone_keeps_name(self):
 
 
 class TestToDatetime(object):
+    @pytest.mark.parametrize('tz', [None, 'US/Central'])
+    def test_to_datetime_dtarr(self, tz):
+        # DatetimeArray
+        dti = date_range('1965-04-03', periods=19, freq='2W', tz=tz)
+        arr = DatetimeArray(dti)
+
+        result = to_datetime(arr)
+        assert result is arr
+
+        result = to_datetime(arr, box=True)
+        assert result is arr
+
     def test_to_datetime_pydatetime(self):
         actual = pd.to_datetime(datetime(2008, 1, 15))
         assert actual == datetime(2008, 1, 15)