6772689: java.sql.Date.valueOf("2042-10-xx").toString() wrong in some time zones

Reviewed-by: peytoia

src/share/classes/sun/util/calendar/ZoneInfo.java

 /*
- * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -297,7 +297,13 @@ public class ZoneInfo extends TimeZone {
             if (type != UTC_TIME) {
                 msec -= rawOffset;
             }
-            int dstoffset = tz.inDaylightTime(new Date(msec)) ? tz.getDSTSavings() : 0;
+            int dstoffset = tz.getOffset(msec) - rawOffset;
+
+            // Check if it's in a standard-to-daylight transition.
+            if (dstoffset > 0 && tz.getOffset(msec - dstoffset) == rawoffset) {
+                dstoffset = 0;
+            }
+
             if (offsets != null) {
                 offsets[0] = rawoffset;
                 offsets[1] = dstoffset;

test/java/util/TimeZone/Bug6772689.java

+/*
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 6772689
+ * @summary Test for standard-to-daylight transitions at midnight:
+ * date stays on the given day.
+ */
+
+import java.util.Calendar;
+import java.util.Date;
+import java.util.GregorianCalendar;
+import java.util.TimeZone;
+import static java.util.GregorianCalendar.*;
+
+public class Bug6772689 {
+    private static final int BEGIN_YEAR = 2035;
+    private static final int END_YEAR = BEGIN_YEAR + 28;
+
+    public static void main(String[] args) {
+        TimeZone defaultTimeZone = TimeZone.getDefault();
+        int errors = 0;
+
+        Calendar cal = new GregorianCalendar(BEGIN_YEAR, MARCH, 1);
+        String[] tzids = TimeZone.getAvailableIDs();
+        try {
+            for (String id : tzids) {
+                TimeZone tz = TimeZone.getTimeZone(id);
+                if (!tz.useDaylightTime()) {
+                    continue;
+                }
+                TimeZone.setDefault(tz);
+
+              dateloop:
+                // Use future dates because sun.util.calendar.ZoneInfo
+                // delegates offset transition calculations to a SimpleTimeZone
+                // (after 2038 as of JDK7).
+                for (int year = BEGIN_YEAR; year < END_YEAR; year++) {
+                    for (int month = MARCH; month <= NOVEMBER; month++) {
+                        cal.set(year, month, 1, 15, 0, 0);
+                        int maxDom = cal.getActualMaximum(DAY_OF_MONTH);
+                        for (int dom = 1; dom <= maxDom; dom++) {
+                            Date date = new Date(year - 1900, month, dom);
+                            if (date.getYear()+1900 != year
+                                || date.getMonth() != month
+                                || date.getDate() != dom) {
+                                System.err.printf("%s: got %04d-%02d-%02d, expected %04d-%02d-%02d%n",
+                                                  id,
+                                                  date.getYear() + 1900,
+                                                  date.getMonth() + 1,
+                                                  date.getDate(),
+                                                  year,
+                                                  month + 1,
+                                                  dom);
+                                errors++;
+                                break dateloop;
+                            }
+                        }
+                    }
+                }
+            }
+        } finally {
+            // Restore the default TimeZone.
+            TimeZone.setDefault(defaultTimeZone);
+        }
+        if (errors > 0) {
+            throw new RuntimeException("Transition test failed");
+        }
+    }
+}