diff --git a/publik_django_templatetags/wcs/context_processors.py b/publik_django_templatetags/wcs/context_processors.py
index 30c24a0..004c172 100644
--- a/publik_django_templatetags/wcs/context_processors.py
+++ b/publik_django_templatetags/wcs/context_processors.py
@@ -14,7 +14,11 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import datetime
+
+from django.utils.dateparse import parse_date, parse_datetime
 from django.utils.http import urlencode
+from django.utils.timezone import is_naive, make_aware
 from requests.exceptions import RequestException
 
 from publik_django_templatetags.utils.requests_wrapper import requests
@@ -103,6 +107,24 @@ class LazyCardDefObjectsManager:
         qs._filters['include-workflow-data'] = 'on'
         return qs
 
+    def get_at(self, value):
+        qs = self._clone()
+        if isinstance(value, str):
+            parsed = parse_datetime(value)
+            if not parsed:
+                parsed = parse_date(value)
+            if parsed:
+                value = parsed
+        if isinstance(value, datetime.datetime):
+            if is_naive(value):
+                value = make_aware(value)
+            value = value.isoformat()
+        elif isinstance(value, datetime.date):
+            value = make_aware(datetime.datetime.combine(value, datetime.datetime.min.time())).isoformat()
+        if value:
+            qs._filters['at'] = value
+        return qs
+
     def access_control(self, user):
         qs = self._clone()
         qs._user = user
diff --git a/publik_django_templatetags/wcs/templatetags/wcs.py b/publik_django_templatetags/wcs/templatetags/wcs.py
index c8b25f7..dfd6982 100644
--- a/publik_django_templatetags/wcs/templatetags/wcs.py
+++ b/publik_django_templatetags/wcs/templatetags/wcs.py
@@ -91,6 +91,11 @@ def include_workflow_data(queryset):
         return None
 
 
+@register.filter
+def get_at(queryset, value):
+    return queryset.get_at(value)
+
+
 @register.filter
 def access_control(queryset, user):
     try:
diff --git a/tests/test_wcs.py b/tests/test_wcs.py
index 9d33041..12da3c4 100644
--- a/tests/test_wcs.py
+++ b/tests/test_wcs.py
@@ -1,6 +1,8 @@
 import copy
+import datetime
 import json
 from unittest import mock
+from urllib.parse import parse_qs, urlparse
 
 import pytest
 from django.template import Context, Template
@@ -184,6 +186,60 @@ def test_include_filters(mock_send, context, nocache):
         assert mock_send.call_args_list == []
 
 
+@mock.patch('requests.Session.send', side_effect=mocked_requests_send)
+def test_at(mock_send, settings, freezer, context, nocache):
+    settings.TIME_ZONE = 'Europe/Paris'
+    freezer.move_to('2022-10-17 12:21')
+
+    def get_at_param(url):
+        parsed = parse_qs(urlparse(url).query)
+        if 'at' not in parsed:
+            return
+        return parsed['at'][0]
+
+    t = Template('{{ cards|objects:"foo"|list }}')
+    t.render(context)
+    assert get_at_param(mock_send.call_args_list[0][0][0].url) is None
+
+    mock_send.reset_mock()
+    t = Template('{{ cards|objects:"foo"|get_at:""|list }}')
+    t.render(context)
+    assert get_at_param(mock_send.call_args_list[0][0][0].url) is None
+
+    mock_send.reset_mock()
+    t = Template('{{ cards|objects:"foo"|get_at:none|list }}')
+    context['none'] = None
+    t.render(context)
+    assert get_at_param(mock_send.call_args_list[0][0][0].url) is None
+
+    mock_send.reset_mock()
+    t = Template('{{ cards|objects:"foo"|get_at:"bad-value"|list }}')
+    t.render(context)
+    assert get_at_param(mock_send.call_args_list[0][0][0].url) == 'bad-value'
+
+    mock_send.reset_mock()
+    t = Template('{{ cards|objects:"foo"|get_at:"2022-10-17"|list }}')
+    t.render(context)
+    assert get_at_param(mock_send.call_args_list[0][0][0].url) == '2022-10-17T00:00:00+02:00'
+
+    mock_send.reset_mock()
+    t = Template('{{ cards|objects:"foo"|get_at:"2022-10-17 23:20"|list }}')
+    t.render(context)
+    assert get_at_param(mock_send.call_args_list[0][0][0].url) == '2022-10-17T23:20:00+02:00'
+
+    mock_send.reset_mock()
+    t = Template('{{ cards|objects:"foo"|get_at:a_date|list }}')
+    context['a_date'] = datetime.date.today()
+    t.render(context)
+    assert get_at_param(mock_send.call_args_list[0][0][0].url) == '2022-10-17T00:00:00+02:00'
+
+    mock_send.reset_mock()
+    t = Template('{{ cards|objects:"foo"|get_at:a_datetime|list }}')
+    context['a_datetime'] = datetime.datetime.now()
+    t.render(context)
+    assert get_at_param(mock_send.call_args_list[0][0][0].url) == '2022-10-17T12:21:00+02:00'
+
+
 @mock.patch('requests.Session.send', side_effect=mocked_requests_send)
 def test_errors(mock_send, context, nocache):
     t = Template('{{ cards|objects:"foo"|list }}')
diff --git a/tox.ini b/tox.ini
index a1e6f23..62b76f3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,6 +16,7 @@ deps =
   pytest
   pytest-cov
   pytest-django
+  pytest-freezegun
   WebTest
   psycopg2-binary<2.9
   psycopg2<2.9