diff --git a/expert/field.py b/expert/field.py
index 45aa1b1..f744776 100644
--- a/expert/field.py
+++ b/expert/field.py
@@ -217,6 +217,7 @@ class TrackDateField(Field):
     fieldType = 'date'
     part = 'date'
     format = 'short'
+    descending = False
     cssClass = 'right'
 
     def getValue(self, row):
@@ -239,6 +240,12 @@ class TrackDateField(Field):
             return ''
         return timeStamp2ISO(value)[:10]
 
+    def getSortValue(self, row):
+        value = self.getRawValue(row)
+        if value and self.descending:
+            return -value
+        return value or None
+
 
 class TrackTimeField(TrackDateField):
 
diff --git a/organize/comment/report.py b/organize/comment/report.py
index 1641877..99c451e 100644
--- a/organize/comment/report.py
+++ b/organize/comment/report.py
@@ -34,7 +34,7 @@ class CommentsOverview(ReportConceptView):
 
 timeStamp = TrackDateField('timeStamp', u'Timestamp',
                 description=u'The date and time the comment was posted.',
-                part='dateTime',
+                part='dateTime', descending=True,
                 executionSteps=['sort', 'output'])
 target = TargetField('taskId', u'Target',
                 description=u'The resource or concept the comment was posted at.',