timedelta too

Author: TomAugspurger

pandas/core/ops.py

@@ -622,7 +622,8 @@ def _is_offset(self, arr_or_obj):
         """ check if obj or all elements of list-like is DateOffset """
         if isinstance(arr_or_obj, ABCDateOffset):
             return True
-        elif is_datetime64_dtype(arr_or_obj):
+        elif (is_datetime64_dtype(arr_or_obj) or
+              is_timedelta64_dtype(arr_or_obj)):
             # Don't want to check elementwise for Series / array of datetime
             return False
         elif is_list_like(arr_or_obj) and len(arr_or_obj):