Use plone.app.event.base.DT to convert datetime -> DateTime

plone/app/discussion/catalog.py

@@ -6,6 +6,7 @@ Also provide event handlers to actually catalog the comments.
 from DateTime import DateTime
 from plone.app.discussion.interfaces import IComment
 from plone.app.discussion.interfaces import IConversation
+from plone.app.event.base import DT
 from plone.base.utils import safe_text
 from plone.indexer import indexer
 from plone.uuid.interfaces import IUUID
@@ -102,43 +103,19 @@ def in_response_to(object):
 @indexer(IComment)
 def effective(object):
     # the catalog index needs Zope DateTime instead of Python datetime
-    return DateTime(
-        object.creation_date.year,
-        object.creation_date.month,
-        object.creation_date.day,
-        object.creation_date.hour,
-        object.creation_date.minute,
-        object.creation_date.second,
-        object.creation_date.tzname(),
-    )
+    return DT( object.creation_date )
 
 
 @indexer(IComment)
 def created(object):
     # the catalog index needs Zope DateTime instead of Python datetime
-    return DateTime(
-        object.creation_date.year,
-        object.creation_date.month,
-        object.creation_date.day,
-        object.creation_date.hour,
-        object.creation_date.minute,
-        object.creation_date.second,
-        object.creation_date.tzname(),
-    )
+    return DT(object.modification_date)
 
 
 @indexer(IComment)
 def modified(object):
     # the catalog index needs Zope DateTime instead of Python datetime
-    return DateTime(
-        object.modification_date.year,
-        object.modification_date.month,
-        object.modification_date.day,
-        object.modification_date.hour,
-        object.modification_date.minute,
-        object.modification_date.second,
-        object.modification_date.tzname(),
-    )
+    return DT(object.modification_date)
 
 
 # Override the conversation indexers for comments