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Apache Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are considered to be so standard as to justify existence in java.lang. The code is tested using the latest revision of the JDK for supported LTS releases: 8, 11, 17 and 21 currently. See https://github.com/apache/commons-lang/blob/master/.github/workflows/maven.yml Please ensure your build environment is up-to-date and kindly report any build issues.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.commons.lang3.time;

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

/**
 * Custom timezone that contains offset from GMT.
 *
 * @since 3.7
 */
class GmtTimeZone extends TimeZone {

    private static final int MILLISECONDS_PER_MINUTE = 60 * 1000;
    private static final int MINUTES_PER_HOUR = 60;
    private static final int HOURS_PER_DAY = 24;

    // Serializable!
    static final long serialVersionUID = 1L;

    private final int offset;
    private final String zoneId;

    GmtTimeZone(final boolean negate, final int hours, final int minutes) {
        if (hours >= HOURS_PER_DAY) {
            throw new IllegalArgumentException(hours + " hours out of range");
        }
        if (minutes >= MINUTES_PER_HOUR) {
            throw new IllegalArgumentException(minutes + " minutes out of range");
        }
        final int milliseconds = (minutes + (hours * MINUTES_PER_HOUR)) * MILLISECONDS_PER_MINUTE;
        offset = negate ? -milliseconds : milliseconds;
        zoneId = twoDigits(
            twoDigits(new StringBuilder(9).append("GMT").append(negate ? '-' : '+'), hours)
                .append(':'), minutes).toString();

    }

    private static StringBuilder twoDigits(final StringBuilder sb, final int n) {
        return sb.append((char) ('0' + (n / 10))).append((char) ('0' + (n % 10)));
    }

    @Override
    public int getOffset(final int era, final int year, final int month, final int day, final int dayOfWeek, final int milliseconds) {
        return offset;
    }

    @Override
    public void setRawOffset(final int offsetMillis) {
        throw new UnsupportedOperationException();
    }

    @Override
    public int getRawOffset() {
        return offset;
    }

    @Override
    public String getID() {
        return zoneId;
    }

    @Override
    public boolean useDaylightTime() {
        return false;
    }

    @Override
    public boolean inDaylightTime(final Date date) {
        return false;
    }

    @Override
    public String toString() {
        return "[GmtTimeZone id=\"" + zoneId + "\",offset=" + offset + ']';
    }

    @Override
    public int hashCode() {
        return offset;
    }

    @Override
    public boolean equals(final Object other) {
        if (!(other instanceof GmtTimeZone)) {
            return false;
        }
        return zoneId == ((GmtTimeZone) other).zoneId;
    }
}