diff --git a/antispam/akismet/entities.py b/antispam/akismet/entities.py
index 91d766a..a620516 100644
--- a/antispam/akismet/entities.py
+++ b/antispam/akismet/entities.py
@@ -1,6 +1,6 @@
 from datetime import datetime
 
-from .utils import get_client_ip, get_timestamp
+from .utils import get_client_ip
 
 
 class Request:
@@ -152,7 +152,7 @@ class Comment:
         params = {
             'comment_type': self.type,
             'comment_content': self.content,
-            'comment_date': get_timestamp(self.created),
+            'comment_date': self.created,
             'permalink': self.permalink,
         }
 
diff --git a/antispam/akismet/utils.py b/antispam/akismet/utils.py
index b6cdf72..c292c1a 100644
--- a/antispam/akismet/utils.py
+++ b/antispam/akismet/utils.py
@@ -18,11 +18,3 @@ def get_client_ip(request):
         return x_forwarded_for.split(',')[0]
 
     return request.META.get('REMOTE_ADDR')
-
-
-def get_timestamp(dt):
-    try:
-        return int(dt.timestamp())
-    except AttributeError:
-        import time
-        return int(time.mktime(dt.timetuple()))

diff --git a/tests/akismet/test_entities.py b/tests/akismet/test_entities.py
index 2f92116..c1e536d 100644
--- a/tests/akismet/test_entities.py
+++ b/tests/akismet/test_entities.py
@@ -70,7 +70,7 @@ class CommentTests(TestCase):
 
         self.assertEqual({
             'comment_content': '<my comment>',
-            'comment_date': int(time.mktime(comment.created.timetuple())),
+            'comment_date': comment.created,
             'comment_type': 'comment',
             'permalink': 'http://mike.example.com/comment-1/',
         }, comment.as_params())

Akismet: AssertionError on comment_date type
python-akismet expects comment_date to be `datetime`, not a timestamp:

https://github.com/Nekmo/python-akismet/blob/322cf3e9a9a1986434a20e01cabb6767e91a226b/akismet/__init__.py#L49

django-antispam provides a timestamp:

https://github.com/mixkorshun/django-antispam/blob/3b193a8360ff8171f0c6d7cc1891fab0b69d0e0a/antispam/akismet/entities.py#L155

So I get an `AssertionError` when calling `akismet.check`
tests/akismet/test_entities.py::CommentTests::test_to_params
tests/akismet/test_entities.py::AuthorTests::test_to_params tests/akismet/test_entities.py::AuthorTests::test_from_django_user tests/akismet/test_entities.py::SiteTests::test_to_params tests/akismet/test_entities.py::RequestTests::test_to_params tests/akismet/test_entities.py::RequestTests::test_from_django_request tests/akismet/test_entities.py::CommentTests::test_to_params_related_resources