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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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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.poi.hwpf.usermodel;

import org.apache.poi.common.Duplicatable;
import org.apache.poi.util.*;

import java.util.Calendar;

/**
 * This class is used to represent a date and time in a Word document.
 */
public final class DateAndTime implements Duplicatable {
    public static final int SIZE = 4;
    private static final BitField _minutes = BitFieldFactory.getInstance(0x3f);
    private static final BitField _hours = BitFieldFactory.getInstance(0x7c0);
    private static final BitField _dom = BitFieldFactory.getInstance(0xf800);
    private static final BitField _months = BitFieldFactory.getInstance(0xf);
    private static final BitField _years = BitFieldFactory.getInstance(0x1ff0);
    // private static final BitField _weekday = BitFieldFactory.getInstance(0xe000);

    private short _info;
    private short _info2;

    public DateAndTime() {
    }

    public DateAndTime(DateAndTime other) {
        _info = other._info;
        _info2 = other._info2;
    }

    public DateAndTime(byte[] buf, int offset) {
        _info = LittleEndian.getShort(buf, offset);
        _info2 = LittleEndian.getShort(buf, offset + LittleEndianConsts.SHORT_SIZE);
    }

    public Calendar getDate() {
        // TODO Discover if the timezone is stored somewhere else or not
        return LocaleUtil.getLocaleCalendar(
                _years.getValue(_info2) + 1900,
                _months.getValue(_info2) - 1,
                _dom.getValue(_info),
                _hours.getValue(_info),
                _minutes.getValue(_info),
                0
        );
    }

    public void serialize(byte[] buf, int offset) {
        LittleEndian.putShort(buf, offset, _info);
        LittleEndian.putShort(buf, offset + LittleEndianConsts.SHORT_SIZE, _info2);
    }

    @Override
    public boolean equals(Object o) {
        if (!(o instanceof DateAndTime)) return false;
        DateAndTime dttm = (DateAndTime) o;
        return _info == dttm._info && _info2 == dttm._info2;
    }

    @Override
    public int hashCode() {
        assert false : "hashCode not designed";
        return 42; // any arbitrary constant will do
    }


    @Override
    public DateAndTime copy() {
        return new DateAndTime(this);
    }

    public boolean isEmpty() {
        return _info == 0 && _info2 == 0;
    }

    @Override
    public String toString() {
        if (isEmpty())
            return "[DTTM] EMPTY";

        return "[DTTM] " + getDate();
    }
}