--- a/server/repository.py	Mon Oct 10 16:15:55 2011 +0200
+++ b/server/repository.py	Tue Oct 11 11:00:24 2011 +0200
@@ -890,7 +890,7 @@
           deleted since the given timestamp
         """
         session = self.internal_session()
-        updatetime = datetime.now()
+        updatetime = datetime.utcnow()
         try:
             modentities, delentities = self.system_source.modified_entities(
                 session, etypes, mtime)