This method calculate difference of years from a couple of Calendar Object. - Java java.util

Java examples for java.util:Year

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Description

This method calculate difference of years from a couple of Calendar Object.

Demo Code

/*/*from  w ww. j  a  va 2  s .  c om*/
 * Copyright 2012 Hiromasa Horiguchi ( The University of Tokyo )
 * 
 * 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.
 */
//package com.java2s;
import java.text.ParseException;
import java.util.Calendar;

public class Main {

    public static Integer calcDifferenceAsYears(Calendar aBaseDate,
            Calendar aTargetDate) throws ParseException {
        if (aBaseDate.getTimeInMillis() > aTargetDate.getTimeInMillis()) {
            return -1
                    * calcDifferenceAsYearsPrivate(aTargetDate, aBaseDate);
        } else {
            return calcDifferenceAsYearsPrivate(aBaseDate, aTargetDate);
        }
    }

    private static int calcDifferenceAsYearsPrivate(Calendar aBaseDate,
            Calendar aTargetDate) {
        int tBaseDateMonth = aBaseDate.get(Calendar.MONTH);
        int tTargetDateMonth = aTargetDate.get(Calendar.MONTH);
        return aTargetDate.get(Calendar.YEAR)
                - aBaseDate.get(Calendar.YEAR)
                - (tBaseDateMonth > tTargetDateMonth
                        || (tBaseDateMonth == tTargetDateMonth && aBaseDate
                                .get(Calendar.DATE) > aTargetDate
                                .get(Calendar.DATE)) ? 1 : 0);
    }
}

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