Java Month Format addMonths(String src, int addMonth, String format)

Description

add Months

License

Apache License

Declaration

public static String addMonths(String src, int addMonth, String format) throws IOException 

Method Source Code

//package com.java2s;
/**/*from ww w  .  jav  a  2 s . co m*/
 * Copyright 2014 tgrape Inc.
 * 
 * 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.
 */

import java.io.IOException;
import java.text.DecimalFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

public class Main {
    public static String addMonths(String src, int addMonth, String format) throws IOException {

        SimpleDateFormat formatter = new SimpleDateFormat(format, Locale.UK);
        SimpleDateFormat informatter = new SimpleDateFormat("yyyyMMdd", Locale.UK);
        SimpleDateFormat yearFormat = new SimpleDateFormat("yyyy", Locale.UK);
        SimpleDateFormat monthFormat = new SimpleDateFormat("MM", Locale.UK);
        SimpleDateFormat dayFormat = new SimpleDateFormat("dd", Locale.UK);
        DecimalFormat fourDf = new DecimalFormat("0000");
        DecimalFormat twoDf = new DecimalFormat("00");

        Calendar calendar = Calendar.getInstance(Locale.UK);
        calendar.setFirstDayOfWeek(Calendar.MONDAY);
        calendar.setMinimalDaysInFirstWeek(4);

        Date date = null;
        try {
            date = formatter.parse(src);
        } catch (ParseException e) {
            throw new IOException(e.getMessage());
        }

        int year = Integer.parseInt(yearFormat.format(date));
        int month = Integer.parseInt(monthFormat.format(date));
        int day = Integer.parseInt(dayFormat.format(date));

        month += addMonth;
        if (addMonth > 0) {
            while (month > 12) {
                month -= 12;
                year += 1;
            }
        } else {
            while (month <= 0) {
                month += 12;
                year -= 1;
            }
        }

        String tempdate = String.valueOf(fourDf.format(year)) + String.valueOf(twoDf.format(month))
                + String.valueOf(twoDf.format(day));

        Date targetdate = null;
        try {
            targetdate = informatter.parse(tempdate);
        } catch (ParseException e) {
            throw new IOException(e.getMessage());
        }

        return formatter.format(targetdate);
    }
}

Related

1. formatMonth(Date date)
2. formatMonth(Date date)
3. formatMonth(final Date date)
4. formatMonth(final int year, final int month)