diff --git a/src/pfwbged/collection/searchview.py b/src/pfwbged/collection/searchview.py
index da37bde..36f1246 100644
--- a/src/pfwbged/collection/searchview.py
+++ b/src/pfwbged/collection/searchview.py
@@ -415,7 +415,10 @@ class QueryBuilder(plone.app.querystring.querybuilder.QueryBuilder):
                 date = param.get('v')
                 try:
                     param = dict(param.copy())
-                    param['v'] = datetime.datetime.strptime(date, '%d/%m/%Y').strftime('%Y-%m-%d')
+                    if type(date) is list: # between...
+                        param['v'] = [datetime.datetime.strptime(x, '%d/%m/%Y').strftime('%Y-%m-%d') for x in date]
+                    else:
+                        param['v'] = datetime.datetime.strptime(date, '%d/%m/%Y').strftime('%Y-%m-%d')
                     query[i] = param
                 except ValueError:
                     pass