Here you can find the source of getEndDateOfMonth(Date given)
public static Date getEndDateOfMonth(Date given)
//package com.java2s;
//License from project: Apache License
import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
public class Main {
public static Date getEndDateOfMonth(Date given) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(given);// www . j av a 2s . com
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH);
int date = calendar.get(Calendar.DATE);
int eom = 31;
if (month == 1) {
if (isLeapYear(year)) {
eom = 29;
} else {
eom = 28;
}
} else if (isBigMonth(month)) {
eom = 31;
} else if (isSmallMonth(month)) {
eom = 30;
}
calendar.set(Calendar.DATE, eom);
return calendar.getTime();
}
private static boolean isLeapYear(int year) {
return ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0));
}
private static boolean isBigMonth(int month) {
int[] months = {0, 2, 4, 6, 7, 9, 11};
return Arrays.stream(months).anyMatch(e -> e == month);
}
private static boolean isSmallMonth(int month) {
int[] months = {3, 5, 8, 10};
return Arrays.stream(months).anyMatch(e -> e == month);
}
}