diff --git a/weboob/capabilities/messages.py b/weboob/capabilities/messages.py
index 4a99352c..e813326c 100644
--- a/weboob/capabilities/messages.py
+++ b/weboob/capabilities/messages.py
@@ -49,7 +49,7 @@ class Message(CapBaseObject):
         self.add_field('title', basestring, title)
         self.add_field('sender', basestring, sender)
         self.add_field('receivers', list, receivers)
-        self.add_field('date', datetime.datetime, date)
+        self.add_field('date', (datetime.datetime, datetime.date), date)
         self.add_field('parent', Message, parent)
         self.add_field('content', basestring, content)
         self.add_field('signature', basestring, signature)
@@ -104,7 +104,7 @@ class Thread(CapBaseObject):
         CapBaseObject.__init__(self, id)
         self.add_field('root', Message)
         self.add_field('title', basestring)
-        self.add_field('date', datetime.datetime)
+        self.add_field('date', (datetime.datetime, datetime.date))
         self.add_field('nb_messages', int)
         self.add_field('nb_unread', int)
         self.add_field('flags', int, self.IS_THREADS)