diff --git a/src/Handler/Course/ParticipantInvite.hs b/src/Handler/Course/ParticipantInvite.hs
index e129b9d53..9678711dd 100644
--- a/src/Handler/Course/ParticipantInvite.hs
+++ b/src/Handler/Course/ParticipantInvite.hs
@@ -121,7 +121,7 @@ getCAddUserR,  postCAddUserR :: TermId -> SchoolId -> CourseShorthand -> Handler
 getCAddUserR = postCAddUserR
 postCAddUserR tid ssh csh = do 
   today <- localDay . TZ.utcToLocalTimeTZ appTZ <$> liftIO getCurrentTime
-  postTAddUserR tid ssh csh (CI.mk $ tshow today)  -- Don't use user date display setting, so that tutorial default names conform to all users
+  postTAddUserR tid ssh csh (CI.mk $ tshow $ succ today)  -- Don't use user date display setting, so that tutorial default names conform to all users
 
 
 getTAddUserR,  postTAddUserR :: TermId -> SchoolId -> CourseShorthand -> TutorialName -> Handler Html