diff --git a/gluon/globals.py b/gluon/globals.py
index 43276e44..59a2f2d4 100644
--- a/gluon/globals.py
+++ b/gluon/globals.py
@@ -1233,7 +1233,7 @@ class Session(Storage):
 
         dd = dict(locked=0,
                   client_ip=response.session_client,
-                  modified_datetime=request.now.isostring(),
+                  modified_datetime=request.now.isoformat(),
                   session_data=session_pickled,
                   unique_key=unique_key)
         if record_id:
diff --git a/gluon/packages/dal b/gluon/packages/dal
index 8e2305ed..74c4a1c8 160000
--- a/gluon/packages/dal
+++ b/gluon/packages/dal
@@ -1 +1 @@
-Subproject commit 8e2305ed3efb923130389e0fd92393d471234ea2
+Subproject commit 74c4a1c832770f15de06d8ac9edd0d47c579bc6c
diff --git a/gluon/packages/yatl b/gluon/packages/yatl
index 2eb050b8..468c093a 160000
--- a/gluon/packages/yatl
+++ b/gluon/packages/yatl
@@ -1 +1 @@
-Subproject commit 2eb050b8e251813e905ecbabba839ca578901a3a
+Subproject commit 468c093ab094a274f200cc9a94b338e1687bce41