Accidentally removed__sub__

Chang She · Chang She · commit e08f299672bf · 2012-04-26T18:37:17.000-04:00
diff --git a/pandas/tseries/index.py b/pandas/tseries/index.py
@@ -150,6 +150,8 @@ class DatetimeIndex(Int64Index):
     __le__ = _dt_index_cmp('__le__')
     __ge__ = _dt_index_cmp('__ge__')
 
+    __sub__ = _dt_index_op('__sub__')
+
     # structured array cache for datetime fields
     _sarr_cache = None
 
