diff --git a/VERSION b/VERSION
index 35c95901..70efd061 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-Version 2.4.2-stable+timestamp.2013.03.06.12.28.09
+Version 2.4.2-stable+timestamp.2013.03.06.12.31.02
diff --git a/gluon/dal.py b/gluon/dal.py
index 314e870f..56e2eb8a 100644
--- a/gluon/dal.py
+++ b/gluon/dal.py
@@ -9535,6 +9535,10 @@ class Query(object):
                         newd[k] = loop(v.__dict__)
                     elif isinstance(v, SERIALIZABLE_TYPES):
                         newd[k] = v
+                    elif isinstance(v, (datetime.date,
+                                        datetime.time,
+                                        datetime.datetime)):
+                        newd[k] = unicode(v)
                 elif k == "op":
                     if callable(v):
                         newd[k] = v.__name__