Previous and Next Date Palindrome

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Calendar;

import java.util.Date;

import java.util.List;

public class DatePalindrome {

    // Function to check if a given date is a palindrome in "YYYYMMDD" format

    public static boolean isPalindrome(String date) {

        int len = date.length();

        for (int i = 0; i < len / 2; i++) {

            if (date.charAt(i) != date.charAt(len - i - 1)) {

                return false;

            }

        }

        return true;

    }

    // Function to format date as "YYYYMMDD"

    public static String formatDate(Date date) {

        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");

        return sdf.format(date);

    }

    // Function to get the next date

    public static Date getNextDate(Date date) {

        Calendar calendar = Calendar.getInstance();

        calendar.setTime(date);

        calendar.add(Calendar.DATE, 1);

        return calendar.getTime();

    }

    // Function to get the previous date

    public static Date getPreviousDate(Date date) {

        Calendar calendar = Calendar.getInstance();

        calendar.setTime(date);

        calendar.add(Calendar.DATE, -1);

        return calendar.getTime();

    }

    // Function to find all next palindrome dates within a given range

    public static List<String> getAllNextPalindromeDates(Date startDate, int limit) {

        List<String> palindromeDates = new ArrayList<>();

        Date nextDate = getNextDate(startDate);

        while (palindromeDates.size() < limit) {

            if (isPalindrome(formatDate(nextDate))) {

                palindromeDates.add(formatDate(nextDate));

            }

            nextDate = getNextDate(nextDate);

        }

        return palindromeDates;

    }

    // Function to find all previous palindrome dates within a given range

    public static List<String> getAllPreviousPalindromeDates(Date startDate, int limit) {

        List<String> palindromeDates = new ArrayList<>();

        Date prevDate = getPreviousDate(startDate);

        while (palindromeDates.size() < limit) {

            if (isPalindrome(formatDate(prevDate))) {

                palindromeDates.add(formatDate(prevDate));

            }

            prevDate = getPreviousDate(prevDate);

        }

        return palindromeDates;

    }

    public static void main(String[] args) throws ParseException {

        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");

        Date date = sdf.parse("20240804");

        int limit = 10;  // Limit to 10 previous and next palindrome dates

        System.out.println("Current Date: " + formatDate(date));

        List<String> nextPalindromes = getAllNextPalindromeDates(date, limit);

        System.out.println("Next Palindrome Dates:");

        for (String nextDate : nextPalindromes) {

            System.out.println(nextDate);

        }

        List<String> previousPalindromes = getAllPreviousPalindromeDates(date, limit);

        System.out.println("Previous Palindrome Dates:");

        for (String prevDate : previousPalindromes) {

            System.out.println(prevDate);

        }

    }

}