BUG: Creating DatetimeIndex from empty array with datetime64 dtype raises IndexError

lesteve · wesm · commit 0329d96fb8b1 · 2013-02-10T16:03:13.000-05:00
diff --git a/pandas/tests/test_common.py b/pandas/tests/test_common.py
@@ -106,6 +106,10 @@ def test_isnull_datetime():
     assert(mask[0])
     assert(not mask[1:].any())
 
+def test_datetimeindex_from_empty_datetime64_array():
+    for unit in [ 'ms', 'us', 'ns' ]:
+        idx = DatetimeIndex(np.array([], dtype='datetime64[%s]' % unit))
+        assert(len(idx) == 0)
 
 def test_any_none():
     assert(com._any_none(1, 2, 3, None))
diff --git a/pandas/tseries/index.py b/pandas/tseries/index.py
@@ -228,7 +228,7 @@ def __new__(cls, data=None,
                     offset = data.offset
                     verify_integrity = False
             else:
-                if data.dtype != _NS_DTYPE:
+                if data.dtype != _NS_DTYPE and data.size:
                     subarr = tslib.cast_to_nanoseconds(data)
                 else:
                     subarr = data
