Index: trunk/src/org/openstreetmap/josm/tools/date/DateUtils.java
===================================================================
--- trunk/src/org/openstreetmap/josm/tools/date/DateUtils.java	(revision 9391)
+++ trunk/src/org/openstreetmap/josm/tools/date/DateUtils.java	(revision 9394)
@@ -303,3 +303,11 @@
         return getDateTimeFormat(dateStyle, timeStyle).format(datetime);
     }
+
+    /**
+     * Allows to override the timezone for unit tests.
+     * @param zone the timezone to use
+     */
+    protected static void setTimeZone(TimeZone zone) {
+        calendarLocale.setTimeZone(zone);
+    }
 }