Apply loffset when aggregating, e.g. using count()

Author: onesandzeroes

pandas/tseries/resample.py

@@ -372,6 +372,8 @@ def _groupby_and_aggregate(self, grouper, how, *args, **kwargs):
             # try to evaluate
             result = grouped.apply(how, *args, **kwargs)
 
+        result = self._apply_loffset(result)
+
         return self._wrap_result(result)
 
     def _apply_loffset(self, result):