/*

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 * 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.

 *

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 */

/*

 * @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");

        }

    }

}