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PrimeFaces is one of the most popular UI libraries in Java EE Ecosystem and widely used by software companies, world renowned brands, banks, financial institutions, insurance companies, universities and more.

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/**
 * Copyright 2009-2018 PrimeTek.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.primefaces.util;

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

public class DateUtils {

    // convert from local date to UTC
    public static Date toUtcDate(TimeZone browserTZ, TimeZone targetTZ, String localDate) {
        if (localDate == null) {
            return null;
        }

        return toUtcDate(browserTZ, targetTZ, Long.valueOf(localDate));
    }

    // convert from local date to UTC
    public static Date toUtcDate(TimeZone browserTZ, TimeZone targetTZ, long localDate) {
        return toUtcDate(browserTZ, targetTZ, new Date(localDate));
    }

    // convert from local date to UTC
    public static Date toUtcDate(TimeZone browserTZ, TimeZone targetTZ, Date localDate) {
        if (localDate == null) {
            return null;
        }

        long local = localDate.getTime();
        int targetOffsetFromUTC = targetTZ.getOffset(local);
        int browserOffsetFromUTC = browserTZ.getOffset(local);

        return new Date(local - targetOffsetFromUTC + browserOffsetFromUTC);
    }

    // convert from UTC to local date
    public static long toLocalDate(TimeZone browserTZ, TimeZone targetTZ, Date utcDate) {
        long utc = utcDate.getTime();
        int targetOffsetFromUTC = targetTZ.getOffset(utc);
        int browserOffsetFromUTC = browserTZ.getOffset(utc);

        return utc + targetOffsetFromUTC - browserOffsetFromUTC;
    }
}