Index: tests/src/java/org/apache/log4j/DRFATestCase.java
===================================================================
--- tests/src/java/org/apache/log4j/DRFATestCase.java	(revision 683512)
+++ tests/src/java/org/apache/log4j/DRFATestCase.java	(working copy)
@@ -502,5 +502,15 @@
                 "witness/drfa_blockedRollover.log"));
     }
 
-
+    /** Check that the computed rollover period for a pattern containing a week as the finest unit is set to be
+     * a week.  Due to a locale mismatch this was incorrect in non-English locales.
+     * {@link https://issues.apache.org/bugzilla/show_bug.cgi?id=40888}
+     * 
+     */
+    public void testWeeklyRollover() {
+    	DailyRollingFileAppender drfa = new DailyRollingFileAppender();
+    	drfa.setDatePattern("'.'yyyy-ww");
+		int checkPeriod = drfa.computeCheckPeriod();
+		assertEquals(DailyRollingFileAppender.TOP_OF_WEEK, checkPeriod);
+    }
 }