test: stabilize time-dependant test after summer time switch

tests/util/test_datetime_helpers.py

@@ -78,12 +78,15 @@ def test_shorten_date() -> None:
 
 
 def test_dt_humanize() -> None:
-    assert dt_humanize_delta(dt_now()) == "now"
-    assert dt_humanize_delta(dt_now() - timedelta(minutes=50)) == "50 minutes ago"
-    assert dt_humanize_delta(dt_now() - timedelta(hours=16)) == "16 hours ago"
-    assert dt_humanize_delta(dt_now() - timedelta(hours=16, minutes=30)) == "16 hours ago"
-    assert dt_humanize_delta(dt_now() - timedelta(days=16, hours=10, minutes=25)) == "a month ago"
-    assert dt_humanize_delta(dt_now() - timedelta(minutes=50)) == "50 minutes ago"
+    with time_machine.travel("2026-03-25 10:01:00 +00:00", tick=False):
+        assert dt_humanize_delta(dt_now()) == "now"
+        assert dt_humanize_delta(dt_now() - timedelta(minutes=50)) == "50 minutes ago"
+        assert dt_humanize_delta(dt_now() - timedelta(hours=16)) == "16 hours ago"
+        assert dt_humanize_delta(dt_now() - timedelta(hours=16, minutes=30)) == "16 hours ago"
+        assert (
+            dt_humanize_delta(dt_now() - timedelta(days=16, hours=10, minutes=25)) == "a month ago"
+        )
+        assert dt_humanize_delta(dt_now() - timedelta(minutes=50)) == "50 minutes ago"
 
 
 def test_format_ms_time() -> None: