diff --git a/swh/web/tests/browse/views/test_origin.py b/swh/web/tests/browse/views/test_origin.py
--- a/swh/web/tests/browse/views/test_origin.py
+++ b/swh/web/tests/browse/views/test_origin.py
@@ -3,7 +3,7 @@
 # License: GNU Affero General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
-from datetime import datetime
+from datetime import datetime, timezone
 import random
 import re
 import string
@@ -673,7 +673,9 @@
     )
     new_origin = archive_data.origin_add([new_origin])[0]
     archive_data.snapshot_add([snapshot])
-    visit = archive_data.origin_visit_add(new_origin["url"], datetime.now(), type="git")
+    visit = archive_data.origin_visit_add(
+        new_origin["url"], datetime.now(tz=timezone.utc), type="git"
+    )
     archive_data.origin_visit_update(
         new_origin["url"], visit.visit, status="full", snapshot=snapshot.id
     )
diff --git a/swh/web/tests/strategies.py b/swh/web/tests/strategies.py
--- a/swh/web/tests/strategies.py
+++ b/swh/web/tests/strategies.py
@@ -9,6 +9,7 @@
 from datetime import datetime
 
 from hypothesis import settings, assume
+from hypothesis.extra.dateutil import timezones
 from hypothesis.strategies import (
     just,
     sampled_from,
@@ -306,7 +307,9 @@
     max_size = nb_dates if nb_dates else 8
     return lists(
         datetimes(
-            min_value=datetime(2015, 1, 1, 0, 0), max_value=datetime(2018, 12, 31, 0, 0)
+            min_value=datetime(2015, 1, 1, 0, 0),
+            max_value=datetime(2018, 12, 31, 0, 0),
+            timezones=timezones(),
         ),
         min_size=min_size,
         max_size=max_size,