Java Date and Time | HackerRank Solution

Hello coders, today we are going to solve Java Date and Time HackerRank Solution.

The Calendar class is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week.

Read about String to Date Conversion in Java – here

Problem

You are given a date. You just need to write the method, getDay, which returns the day on that date. To simplify your task, we have provided a portion of the code in the editor.

Example

month = 8 day = 14 year = 2017

The method should return MONDAY as the day on that date.

Function Description

Complete the findDay function in the editor below.

findDay has the following parameters:

• int: month
• int: day
• int: year

Returns

string: the day of the week in capital letters

Input Format

A single line of input containing the space separated month, day and year, MM DD YYYY respectively, in format.

Constraints

2000 <= year <= 3000

Sample Input

 08 05 2015

Sample Output

 WEDNESDAY

Explanation

The day on August 15^th 2015 was WEDNESDAY.

Solution – Java Date and Time

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;
import java.time.LocalDate;
//===========================SOLUTION==============================//
class Result {

    /*
     * Complete the 'findDay' function below.
     *
     * The function is expected to return a STRING.
     * The function accepts following parameters:
     *  1. INTEGER month
     *  2. INTEGER day
     *  3. INTEGER year
     */

    public static String findDay(int month, int day, int year) {

        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.MONTH,month-1);
        cal.set(Calendar.DAY_OF_MONTH,day);
        cal.set(Calendar.YEAR,year);
String dayOfWeek = cal.getDisplayName(Calendar.DAY_OF_WEEK, Calendar.LONG, Locale.US).toUpperCase();
        return dayOfWeek;

    }

}
//=============================SOLUTION-END=============================//
public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        String[] firstMultipleInput = bufferedReader.readLine().replaceAll("\\s+$", "").split(" ");

        int month = Integer.parseInt(firstMultipleInput[0]);

        int day = Integer.parseInt(firstMultipleInput[1]);

        int year = Integer.parseInt(firstMultipleInput[2]);

        String res = Result.findDay(month, day, year);

        bufferedWriter.write(res);
        bufferedWriter.newLine();

        bufferedReader.close();
        bufferedWriter.close();
    }
}

Disclaimer: The above Problem ( Java Date and Time ) is generated by Hacker Rank but the Solution is Provided by CodingBroz. This tutorial is only for Educational and Learning Purpose.