diff --git a/core/modules/datetime/src/Tests/DateTestBase.php b/core/modules/datetime/src/Tests/DateTestBase.php
index 81e7550..d970a34 100644
--- a/core/modules/datetime/src/Tests/DateTestBase.php
+++ b/core/modules/datetime/src/Tests/DateTestBase.php
@@ -71,6 +71,8 @@
     'Pacific/Funafuti',
     // UTC+13, no DST.
     'Pacific/Tongatapu',
+    // UTC+12, with DST.
+    'Pacific/Auckland',
   ];
 
   /**