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BUG: DatetimeIndex raises AttributeError on win #13736

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BUG: DatetimeIndex raises AttributeError on win #13736

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5 changes: 4 additions & 1 deletion pandas/tseries/index.py
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Original file line number Diff line number Diff line change
Expand Up @@ -329,9 +329,12 @@ def __new__(cls, data=None,
subarr = tslib.cast_to_nanoseconds(data)
else:
subarr = data
elif data.dtype == _INT64_DTYPE:
else:
# must be integer dtype otherwise
if isinstance(data, Int64Index):
raise TypeError('cannot convert Int64Index->DatetimeIndex')
if data.dtype != _INT64_DTYPE:
data = data.astype(np.int64)
subarr = data.view(_NS_DTYPE)

if isinstance(subarr, DatetimeIndex):
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10 changes: 10 additions & 0 deletions pandas/tseries/tests/test_timeseries.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1520,6 +1520,16 @@ def test_dti_constructor_years_only(self):
(rng3, expected3), (rng4, expected4)]:
tm.assert_index_equal(rng, expected)

def test_dti_constructor_small_int(self):
# GH 13721
exp = DatetimeIndex(['1970-01-01 00:00:00.00000000',
'1970-01-01 00:00:00.00000001',
'1970-01-01 00:00:00.00000002'])

for dtype in [np.int64, np.int32, np.int16, np.int8]:
arr = np.array([0, 10, 20], dtype=dtype)
tm.assert_index_equal(DatetimeIndex(arr), exp)

def test_normalize(self):
rng = date_range('1/1/2000 9:30', periods=10, freq='D')

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