diff --git a/flexmeasures/utils/tests/test_time_utils.py b/flexmeasures/utils/tests/test_time_utils.py
index f14d0a20f..0c15d68fd 100644
--- a/flexmeasures/utils/tests/test_time_utils.py
+++ b/flexmeasures/utils/tests/test_time_utils.py
@@ -12,11 +12,25 @@
 
 @pytest.mark.parametrize(
     "dt_tz,now,server_tz,delta_in_h,exp_result",
+    # there can be two results depending of today's date, due to humanize.
+    # Monekypatching was too hard.
     [
         (None, datetime.utcnow(), "UTC", 3, "3 hours ago"),
-        (None, datetime(2021, 5, 17, 3), "Europe/Amsterdam", 48, "May 15"),
+        (
+            None,
+            datetime(2021, 5, 17, 3),
+            "Europe/Amsterdam",
+            48,
+            ("May 15", "May 15 2021"),
+        ),
         ("Asia/Seoul", "server_now", "Europe/Amsterdam", 1, "an hour ago"),
-        ("UTC", datetime(2021, 5, 17, 3), "Asia/Seoul", 24 * 7, "May 10"),
+        (
+            "UTC",
+            datetime(2021, 5, 17, 3),
+            "Asia/Seoul",
+            24 * 7,
+            ("May 10", "May 10 2021"),
+        ),
         ("UTC", datetime(2021, 5, 17, 3), "Asia/Seoul", None, "never"),
     ],
 )
@@ -31,17 +45,19 @@ def test_naturalized_datetime_str(
 ):
     monkeypatch.setitem(app.config, "FLEXMEASURES_TIMEZONE", server_tz)
     if now == "server_now":
-        now = server_now()  # done this way as it needs app context
+        now = server_now()  # done this way as it needs (patched) app context
     if now.tzinfo is None:
-        now.replace(tzinfo=pytz.utc)  # assuming UTC
+        now = now.replace(tzinfo=pytz.utc)  # assuming UTC
     if delta_in_h is not None:
         h_ago = now - timedelta(hours=delta_in_h)
         if dt_tz is not None:
             h_ago = h_ago.astimezone(pytz.timezone(dt_tz))
     else:
         h_ago = None
-    print(h_ago)
-    assert naturalized_datetime_str(h_ago, now=now) == exp_result
+    if isinstance(exp_result, tuple):
+        assert naturalized_datetime_str(h_ago, now=now) in exp_result
+    else:
+        assert naturalized_datetime_str(h_ago, now=now) == exp_result
 
 
 @pytest.mark.parametrize(