diff --git a/s3tests/functional/test_s3.py b/s3tests/functional/test_s3.py
index 2ee91b3..bf2f2b1 100644
--- a/s3tests/functional/test_s3.py
+++ b/s3tests/functional/test_s3.py
@@ -138,6 +138,9 @@ def _create_objects(bucket=None, bucket_name=None, keys=[], put_object_args={}):
 
     return bucket_name
 
+def _utcnow_naive():
+    return datetime.datetime.now(datetime.timezone.utc).replace(tzinfo=None)
+
 def _get_keys(response):
     """
     return lists of strings that are the keys from a client.list_objects() response
@@ -1760,15 +1763,8 @@ def test_multi_objectv2_delete():
 
 def test_multi_object_delete_key_limit():
     key_names = [f"key-{i}" for i in range(1001)]
-    bucket_name = _create_objects(keys=key_names)
     client = get_client()
-
-    paginator = client.get_paginator('list_objects')
-    pages = paginator.paginate(Bucket=bucket_name)
-    numKeys = 0
-    for page in pages:
-        numKeys += len(page['Contents'])
-    assert numKeys == 1001
+    bucket_name = get_new_bucket(client)
 
     objs_dict = _make_objs_dict(key_names=key_names)
     e = assert_raises(ClientError,client.delete_objects,Bucket=bucket_name,Delete=objs_dict)
@@ -1777,15 +1773,8 @@ def test_multi_object_delete_key_limit():
 
 def test_multi_objectv2_delete_key_limit():
     key_names = [f"key-{i}" for i in range(1001)]
-    bucket_name = _create_objects(keys=key_names)
     client = get_client()
-
-    paginator = client.get_paginator('list_objects_v2')
-    pages = paginator.paginate(Bucket=bucket_name)
-    numKeys = 0
-    for page in pages:
-        numKeys += len(page['Contents'])
-    assert numKeys == 1001
+    bucket_name = get_new_bucket(client)
 
     objs_dict = _make_objs_dict(key_names=key_names)
     e = assert_raises(ClientError,client.delete_objects,Bucket=bucket_name,Delete=objs_dict)
@@ -9163,7 +9152,7 @@ def test_lifecycle_expiration_header_put():
     bucket_name = get_new_bucket()
     client = get_client()
 
-    now = datetime.datetime.utcnow()
+    now = _utcnow_naive()
     response = setup_lifecycle_expiration(
         client, bucket_name, 'rule1', 1, 'days1/')
     assert check_lifecycle_expiration_header(response, now, 'rule1', 1)
@@ -9175,7 +9164,7 @@ def test_lifecycle_expiration_header_head():
     bucket_name = get_new_bucket()
     client = get_client()
 
-    now = datetime.datetime.utcnow()
+    now = _utcnow_naive()
     response = setup_lifecycle_expiration(
         client, bucket_name, 'rule1', 1, 'days1/')
 
@@ -9246,7 +9235,7 @@ def test_lifecycle_expiration_header_tags_head():
 @pytest.mark.lifecycle_expiration
 @pytest.mark.fails_on_dbstore
 def test_lifecycle_expiration_header_and_tags_head():
-    now = datetime.datetime.utcnow()
+    now = _utcnow_naive()
     bucket_name = get_new_bucket()
     client = get_client()
     lifecycle={