From ffcceb94ba20effd0fe33c75ff89a0030c6a1122 Mon Sep 17 00:00:00 2001
From: Thomas A Caswell <tcaswell@gmail.com>
Date: Fri, 4 Sep 2026 16:44:30 -0400
Subject: [PATCH] MNT: Future version of dateutil warns on non-existent time
 zone

Which in turn fails our tests.
---
 lib/matplotlib/tests/test_dates.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/matplotlib/tests/test_dates.py b/lib/matplotlib/tests/test_dates.py
index 572891e91653..5245b14777f3 100644
--- a/lib/matplotlib/tests/test_dates.py
+++ b/lib/matplotlib/tests/test_dates.py
@@ -1300,6 +1300,7 @@ def test_change_interval_multiples():
     assert ax.get_xticklabels()[1].get_text() == 'Feb 01 2020'
 
 
+@pytest.mark.filterwarnings("ignore:I/O error")
 def test_DateLocator():
     locator = mdates.DateLocator()
     # Test nonsingular