Java Month Calculate monthsBetween(String pFormerStr, String pLatterStr)

Description

months Between

License

Apache License

Declaration

public static int monthsBetween(String pFormerStr, String pLatterStr) 

Method Source Code

//package com.java2s;
/*/*from   w  ww. j  a  va  2s. c  om*/
 * (C) 2013-2015 Asiainfo-linkage Group Holding Limited.
 *
 * 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.
 * Authors:
 *   davylin<linjxljx@gmail.com>
 */

import java.util.*;

public class Main {
    static StringTokenizer sToken;

    public static int monthsBetween(String pFormerStr, String pLatterStr) {
        GregorianCalendar vFormer = parse2Cal(pFormerStr);
        GregorianCalendar vLatter = parse2Cal(pLatterStr);
        return monthsBetween(vFormer, vLatter);
    }

    public static int monthsBetween(GregorianCalendar pFormer, GregorianCalendar pLatter) {
        GregorianCalendar vFormer = pFormer;
        GregorianCalendar vLatter = pLatter;
        boolean vPositive = true;
        if (pFormer.before(pLatter)) {
            vFormer = pFormer;
            vLatter = pLatter;
        } else {
            vFormer = pLatter;
            vLatter = pFormer;
            vPositive = false;
        }
        int vCounter;
        for (vCounter = 0; vFormer.get(1) != vLatter.get(1) || vFormer.get(2) != vLatter.get(2); vCounter++)
            vFormer.add(2, 1);

        if (vPositive)
            return vCounter;
        else
            return -vCounter;
    }

    public static GregorianCalendar parse2Cal(String pDateStr) {
        sToken = new StringTokenizer(pDateStr, "-/");
        int vYear = Integer.parseInt(sToken.nextToken());
        int vMonth = Integer.parseInt(sToken.nextToken()) - 1;
        int vDayOfMonth = Integer.parseInt(sToken.nextToken());
        return new GregorianCalendar(vYear, vMonth, vDayOfMonth);
    }
}

Related

1. incrementMonth(long date, int increment)
2. intToCalendarMonth(int month)
3. isFirstOfMonth(long date)
4. isMonthEnd(Date date)
5. isSameMonth(final Calendar c1, final Calendar c2)
6. nextMonth(Date date, int months)
7. nextMonths(int diff)
8. startOfMonth(Date d)
9. startOfMonth(Date date)