--- a/cubicweb/misc/migration/3.11.0_Any.py	Wed Oct 05 15:28:43 2016 +0200
+++ b/cubicweb/misc/migration/3.11.0_Any.py	Fri Sep 30 18:25:08 2016 +0200
@@ -1,5 +1,3 @@
-from datetime import datetime
-
 for rtype in ('cw_support', 'cw_dont_cross', 'cw_may_cross'):
     drop_relation_type(rtype)