Java Day of Month getLastDayOfMonth(int year, int month)

Description

get Last Day Of Month

License

Apache License

Declaration

public static Integer getLastDayOfMonth(int year, int month) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

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

public class Main {

    public static Integer getLastDayOfMonth(int year, int month) {
        return intDateSub(getIntDate(newCalendar(year, month + 1, 1)), 1);
    }/*from   w w  w  . j a  v a 2  s.co m*/

    public static Integer intDateSub(int date, int days) {
        return intDateAdd(date, -days);
    }

    public static Integer getIntDate(int year, int month, int day) {
        return getIntDate(newCalendar(year, month, day));
    }

    public static Integer getIntDate(Calendar c) {
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH) + 1;
        int day = c.get(Calendar.DAY_OF_MONTH);
        return year * 10000 + month * 100 + day;
    }

    public static Integer getIntDate(Date d) {
        if (d == null) {
            return null;
        }
        Calendar c = Calendar.getInstance();
        c.setTime(d);
        return getIntDate(c);
    }

    public static Calendar newCalendar(int year, int month, int day) {
        Calendar ret = Calendar.getInstance();
        if (year < 100) {
            year = 2000 + year;
        }
        ret.set(year, month - 1, day);
        return ret;
    }

    public static Calendar newCalendar(int date) {
        int year = date / 10000;
        int month = (date % 10000) / 100;
        int day = date % 100;

        Calendar ret = Calendar.getInstance();
        ret.set(year, month - 1, day);
        return ret;
    }

    public static Integer intDateAdd(int date, int days) {
        int year = date / 10000;
        int month = (date % 10000) / 100;
        int day = date % 100;

        day += days;

        return getIntDate(year, month, day);
    }
}

Related

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2. getLastDayOfMonth(int year, int month)
3. getLastDayOfMonth(int year, int month)
4. getLastDayOfMonth(int year, int month)
5. getLastDayOfMonth(int year, int month)
6. getLastDayOfMonth(int year, int month)
7. getLastDayOfMonth(java.util.Date date)
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