diff -r 38afb7e23c6c -r 63d860a14a17 dataimport/test/test_stores.py
--- a/dataimport/test/test_stores.py	Fri Dec 18 09:37:15 2015 +0100
+++ b/dataimport/test/test_stores.py	Fri Dec 18 09:23:23 2015 +0100
@@ -75,7 +75,7 @@
             metagen = stores.MetaGenerator(cnx)
             # hijack gen_modification_date to ensure we don't go through it
             metagen.gen_modification_date = None
-            md = DT.datetime.now() - DT.timedelta(days=1)
+            md = DT.datetime.utcnow() - DT.timedelta(days=1)
             entity, rels = metagen.base_etype_dicts('CWUser')
             entity.cw_edited.update(dict(modification_date=md))
             with cnx.ensure_cnx_set: