diff -r dc0e33a95c05 -r 44d6e41c0b62 schemas/base.py
--- a/schemas/base.py	Fri Oct 07 16:58:29 2011 +0200
+++ b/schemas/base.py	Fri Oct 07 17:18:10 2011 +0200
@@ -22,7 +22,8 @@
 
 from yams.buildobjs import (EntityType, RelationType, RelationDefinition,
                             SubjectRelation,
-                            String, Datetime, Password, Interval, Boolean)
+                            String, TZDatetime, Datetime, Password, Interval,
+                            Boolean)
 from cubicweb.schema import (
     RQLConstraint, WorkflowableEntityType, ERQLExpression, RRQLExpression,
     PUB_SYSTEM_ENTITY_PERMS, PUB_SYSTEM_REL_PERMS, PUB_SYSTEM_ATTR_PERMS)