Java Date and Time

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.

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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, respectively, in MM DD YYYY format.

Constraints

• 2000 < year <3000

Sample Input

08 05 2015

Sample Output

WEDNESDAY

Explanation

The day on August 5<sup>th</sup> 2015 was WEDNESDAY.

Solution:

Language Used: Java

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;

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) 
{
        // We use a Calendar object which we construct with GregorianCalendar constructor where month is 0 based (January = 0)
        Calendar calendar = new GregorianCalendar(year, month - 1, day);

        /* 
            We use calendar.getDisplayName method which receives the field format we want to display, day of week in this case, 
            a style to apply to the String representation, Long in this case and the Locale for our String representation, US.
            Finally we upper case it.
        */
        return calendar.getDisplayName(calendar.DAY_OF_WEEK, calendar.LONG,       Locale.US).toUpperCase();
    }

}

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();
    }
}