change import for discussion modification_date from datetime to DateTime.

svn path=/plone.app.discussion/trunk/; revision=27204

plone/app/discussion/comment.py

@@ -1,6 +1,6 @@
 """The default comment class and factory.
 """
-from datetime import datetime
+from DateTime import DateTime
 from zope.interface import implements
 from zope.component.factory import Factory
 
@@ -50,7 +50,7 @@ class Comment(DynamicType, Traversable, RoleManager, Owned, Explicit):
     # IConversation.addComment().
 
     def __init__(self):
-        self.creation_date = self.modification_date = datetime.now()
+        self.creation_date = self.modification_date = DateTime()
 
     @property
     def __name__(self):