diff --git a/src/pfwbged/collection/searchview.py b/src/pfwbged/collection/searchview.py
index fb34482..60fa674 100644
--- a/src/pfwbged/collection/searchview.py
+++ b/src/pfwbged/collection/searchview.py
@@ -1,5 +1,6 @@
 from collections import OrderedDict
 import json
+import datetime
 
 from Products.CMFPlone.utils import base_hasattr
 
@@ -406,6 +407,15 @@ class ContentListingView(BrowserView):
 
 class QueryBuilder(plone.app.querystring.querybuilder.QueryBuilder):
     def _makequery(self, *args, **kwargs):
+        for i, param in enumerate(kwargs.get('query', [])):
+            if param.get('o', '').startswith('plone.app.querystring.operation.date'):
+                date = param.get('v')
+                try:
+                    param = dict(param.copy())
+                    param['v'] = datetime.datetime.strptime(date, '%m/%d/%Y').strftime('%Y-%m-%d')
+                    kwargs.get('query')[i] = param
+                except ValueError:
+                    pass
         results = plone.app.querystring.querybuilder.QueryBuilder._makequery(self, *args, **kwargs)
         if isinstance(results, ContentListing):
             # results may have been padded with None, but ContentListing