Java Date Calculate calculationAge(Date birthday, Date calculateDay)

Description

calculation Age

License

Open Source License

Declaration

public static final int calculationAge(Date birthday, Date calculateDay) 

Method Source Code

//package com.java2s;

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

public class Main {

    public static final int calculationAge(Date birthday, Date calculateDay) {
        @SuppressWarnings("unused")
        int day = 1, month = 0, year = 1, ageYears, ageMonths, ageDays;
        Calendar calculate = Calendar.getInstance();
        calculate.setTime(calculateDay);
        Calendar birth = Calendar.getInstance();
        birth.setTime(birthday);//  w  w w .j  av a2s  .co  m

        try {
            year = birth.get(Calendar.YEAR);
            if (year > calculate.get(Calendar.YEAR)) {
                System.out.println("Invalid year");
            }
            month = birth.get(Calendar.MONTH);
            if (month < 0 || month > 11) {
                System.out.println("month between 1 to 12.");
                return 0;
            } else {
                // month--;
                if (year == calculate.get(Calendar.YEAR)) {
                    if (month > calculate.get(Calendar.MONTH)) {
                        System.out.println("Invalid month");
                        return 0;
                    }
                }
            }
            day = birth.get(Calendar.DATE);
            if (month == 0 || month == 2 || month == 4 || month == 6 || month == 7 || month == 9 || month == 11) {
                if (day > 31 || day < 1) {
                    System.out.println("day between 1 to 31");
                    return 0;
                }
            } else if (month == 3 || month == 5 || month == 8 || month == 10) {
                if (day > 30 || day < 1) {
                    System.out.println("day between 1 to 30");
                    return 0;
                }
            } else {
                if (new GregorianCalendar().isLeapYear(year)) {
                    if (day < 1 || day > 29) {
                        System.out.println("day between 1 to 29");
                        return 0;
                    }
                } else if (day < 1 || day > 28) {
                    System.out.println("day between 1 to 28.");
                    return 0;
                }
            }
            if (year == calculate.get(Calendar.YEAR)) {
                if (month == calculate.get(Calendar.MONTH)) {
                    if (day > calculate.get(Calendar.DAY_OF_MONTH)) {
                        System.out.println("Invalid date");
                        return 0;
                    }
                }
            }
        } catch (NumberFormatException ne) {
            System.out.println(ne.getMessage() + " is not a legal entry");
            return 0;
        }

        Calendar bd = new GregorianCalendar(year, month, day);
        ageYears = calculate.get(Calendar.YEAR) - bd.get(Calendar.YEAR);
        if (calculate.before(new GregorianCalendar(calculate.get(Calendar.YEAR), month, day))) {
            ageYears--;
            ageMonths = (12 - (bd.get(Calendar.MONTH) + 1)) + (bd.get(Calendar.MONTH));
            if (day > calculate.get(Calendar.DAY_OF_MONTH)) {
                ageDays = day - calculate.get(Calendar.DAY_OF_MONTH);
            } else if (day < calculate.get(Calendar.DAY_OF_MONTH)) {
                ageDays = calculate.get(Calendar.DAY_OF_MONTH) - day;
            } else {
                ageDays = 0;
            }
        } else if (calculate.after(new GregorianCalendar(calculate.get(Calendar.YEAR), month, day))) {
            ageMonths = (calculate.get(Calendar.MONTH) - (bd.get(Calendar.MONTH)));
            if (day > calculate.get(Calendar.DAY_OF_MONTH))
                ageDays = day - calculate.get(Calendar.DAY_OF_MONTH) - day;
            else if (day < calculate.get(Calendar.DAY_OF_MONTH)) {
                ageDays = calculate.get(Calendar.DAY_OF_MONTH) - day;
            } else
                ageDays = 0;
        } else {
            ageYears = calculate.get(Calendar.YEAR) - bd.get(Calendar.YEAR);
            ageMonths = 0;
            ageDays = 0;
        }

        return ageYears;
    }
}

Related

1. calculateTime(Date date, String addpart, int num)
2. calculateTime(Date sendTime, String timeZoneID)
3. calculateTimestamp()
4. calculateTruncatedTime(final Date dateTimeBegin, final Date dateTimeEnd, final Date begin, final Date end)
5. calculateTruncatedTimeByDays( final Date dateTimeStart, final Date dateTimeEnd, final Date start, final Date end)
6. getDateCalculate(int d)