Java Month Format monthsBetween(String from, String to, String format)

Description

months Between

License

Apache License

Declaration

public static int monthsBetween(String from, String to, String format) throws IOException 

Method Source Code

//package com.java2s;
/**//from w  w w  . ja  va 2 s .  com
 * 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.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

public class Main {
    public static int monthsBetween(String from, String to, String format) throws IOException {

        SimpleDateFormat formatter = new SimpleDateFormat(format, Locale.UK);

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

        Date fromDate = null;
        Date toDate = null;
        try {
            fromDate = formatter.parse(from);
            toDate = formatter.parse(to);
        } catch (ParseException e) {
            throw new IOException(e.getMessage());
        }

        if (fromDate.compareTo(toDate) == 0)
            return 0;

        SimpleDateFormat yearFormat = new SimpleDateFormat("yyyy", Locale.UK);
        SimpleDateFormat monthFormat = new SimpleDateFormat("MM", Locale.UK);
        SimpleDateFormat dayFormat = new SimpleDateFormat("dd", Locale.UK);

        int fromYear = Integer.parseInt(yearFormat.format(fromDate));
        int toYear = Integer.parseInt(yearFormat.format(toDate));
        int fromMonth = Integer.parseInt(monthFormat.format(fromDate));
        int toMonth = Integer.parseInt(monthFormat.format(toDate));
        int fromDay = Integer.parseInt(dayFormat.format(fromDate));
        int toDay = Integer.parseInt(dayFormat.format(toDate));

        int result = 0;
        result += ((toYear - fromYear) * 12);
        result += (toMonth - fromMonth);

        // ceil & floor
        if (((toDay - fromDay) > 0))
            result += toDate.compareTo(fromDate);

        return result;
    }
}

Related

1. getFormatCurMonthAsYYYYMM()
2. getLastYearMonthYYYYMM()
3. getMonthFormat(String dateString)
4. getUpMonthDate(String date, String dateFormat)
5. getYesterMonthDate(String format)