Java Age Calculate getAgeFromBirthDate(Date birth, boolean estimate)

Description

get Age From Birth Date

License

Open Source License

Declaration

public static String getAgeFromBirthDate(Date birth, boolean estimate) 

Method Source Code

//package com.java2s;
/**/* ww  w .j  a v a  2 s . c  o m*/
 *  Copyright 2010 Society for Health Information Systems Programmes, India (HISP India)
 *
 *  This file is part of Patient-dashboard module.
 *
 *  Patient-dashboard module is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
    
 *  Patient-dashboard module is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Patient-dashboard module.  If not, see <http://www.gnu.org/licenses/>.
 *
 **/

import java.util.Calendar;
import java.util.Date;

public class Main {
    public static String getAgeFromBirthDate(Date birth, boolean estimate) {
        String result = "";
        //           var d = parseDateString(birth.substring(0,9));
        //           Date d2 = parseDateString(birth);

        Calendar now = Calendar.getInstance();
        Calendar bd = Calendar.getInstance();
        bd.setTime(birth);

        // The number of milliseconds in one day
        long ONE_DAY = 1000 * 60 * 60 * 24;

        // Convert both dates to milliseconds
        long date1_ms = now.getTimeInMillis();
        long date2_ms = bd.getTimeInMillis();

        // Calculate the difference in milliseconds
        long difference_ms = Math.abs(date1_ms - date2_ms);

        int day = Math.round(difference_ms / ONE_DAY);

        String est = "";

        if (estimate) {
            est = "~";
        }
        if (bd.get(Calendar.YEAR) < now.get(Calendar.YEAR) && day > now.getActualMaximum(Calendar.DAY_OF_YEAR)) {
            int year = now.get(Calendar.YEAR) - bd.get(Calendar.YEAR);
            if (year == 1) {
                result = est + year + " year";
            } else {
                result = est + year + " years";
            }
        } else if (day > 31) {
            int month = 0;
            if (bd.get(Calendar.YEAR) < now.get(Calendar.YEAR))
                month = 12 - bd.get(Calendar.MONTH) + now.get(Calendar.MONTH);
            if (bd.get(Calendar.YEAR) == now.get(Calendar.YEAR))
                month = now.get(Calendar.MONTH) - bd.get(Calendar.MONTH);
            if (month == 1) {
                result += est + month + " month";
            } else {
                result += est + month + " months";
            }
        } else {
            if (day == 1) {
                result += est + day + "day";
            } else {
                result += est + day + " days";
            }
        }
        return result;
    }
}

Related

1. getAge(Date time, Date birth)
2. getAge(final Date birthDay, final Date currDate)
3. getAge(String year)
4. getAge1(Date birthDay)
5. getAgeAt(final Date birthday, final Date date)
6. getAgeFromBirthday(Date birthday)
7. getAgeFromBirthday(Date date)
8. getAgeFromDate(Date snapshotDate, Date birthdate)