Index: stamper/filters.py
===================================================================
--- stamper/filters.py	(revision 63)
+++ stamper/filters.py	(revision 65)
@@ -75,5 +75,5 @@
         """
         number = None
-        filter_from = None
+        filtered_date = None
 
         if re.search(r'(\d+[dD]{1})', number_filter):