Adjust unit test for ISO8601 dates to Java 23.

xstream/src/test/com/thoughtworks/xstream/converters/extended/ISO8601DateConverterTest.java

@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2004, 2005 Joe Walnes.
- * Copyright (C) 2006, 2007, 2018 XStream Committers.
+ * Copyright (C) 2006, 2007, 2018, 2024 XStream Committers.
  * All rights reserved.
  *
  * The software in this package is published under the terms of the BSD
@@ -16,6 +16,7 @@
 import java.util.Calendar;
 import java.util.Date;
 
+import com.thoughtworks.xstream.core.JVM;
 import com.thoughtworks.xstream.testutil.TimeZoneChanger;
 
 import junit.framework.TestCase;
@@ -30,7 +31,7 @@ protected void setUp() throws Exception {
         super.setUp();
         converter = new ISO8601DateConverter();
 
-        // Ensure that this test always run as if it were in the EST timezone.
+        // Ensure that this test always run as if it were in the EST (Eastern Standard) timezone (UTC-05:00).
         // This prevents failures when running the tests in different zones.
         // Note: 'EST' has no relevance - it was just a randomly chosen zone.
         TimeZoneChanger.change("EST");
@@ -64,7 +65,7 @@ public void testUnmarshallsISOFormatInUTC() throws ParseException {
         final Date out = (Date)converter.fromString(isoFormat);
         final Date control = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(simpleFormat);
         // verify for EST
-        assertEquals("Sun Feb 14 13:10:30 EST 1993", out.toString());
+        assertEquals("Sun Feb 14 13:10:30 " + (JVM.isVersion(23) ? "GMT-05:00" : "EST") + " 1993", out.toString());
         assertEquals(control, out);
     }