diff -r 38afb7e23c6c -r 63d860a14a17 dataimport/massive_store.py
--- a/dataimport/massive_store.py	Fri Dec 18 09:37:15 2015 +0100
+++ b/dataimport/massive_store.py	Fri Dec 18 09:23:23 2015 +0100
@@ -119,7 +119,7 @@
         self._dbh = PGHelper(self._cnx, pg_schema)
         self._data_entities = defaultdict(list)
         self._data_relations = defaultdict(list)
-        self._now = datetime.now()
+        self._now = datetime.utcnow()
         self._default_cwuri = make_uid('_auto_generated')
         self._count_cwuri = 0
         self.on_commit_callback = on_commit_callback