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/*
 * Copyright (c) 2015, 2017 Cisco Systems, Inc. and others. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */

package org.opendaylight.sfc.tacker.util;

import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

public final class DateUtils {

    private DateUtils() {
    }

    public static Date getUtcDate(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);

        TimeZone timeZone = calendar.getTimeZone();
        int offset = timeZone.getRawOffset();
        if (timeZone.inDaylightTime(new Date())) {
            offset = offset + timeZone.getDSTSavings();
        }
        int offsetHrs = offset / 1000 / 60 / 60;
        int offsetMins = offset / 1000 / 60 % 60;

        calendar.add(Calendar.HOUR_OF_DAY, -offsetHrs);
        calendar.add(Calendar.MINUTE, -offsetMins);

        return calendar.getTime();
    }

    public static Date addHours(Date date, int hours) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.add(Calendar.HOUR, hours); // minus number would decrement the days
        return cal.getTime();
    }
}