Java Date and Time

https://www.hackerrank.com/challenges/java-date-and-time/problem?isFullScreen=true

Java Date and Time | HackerRank

https://docs.oracle.com/javase/7/docs/api/constant-values.html#java.util.Calendar.DAY_OF_WEEK

Constant Field Values (Java Platform SE 7 )

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;

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
     */
     
     /*
DAY_OF_WEEK
public static final int DAY_OF_WEEK
Field number for get and set indicating the day of the week. This field takes values SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, and SATURDAY.
SUNDAY        1
    MONDAY    2
    TUESDAY        3
    WEDNESDAY    4
    THURSDAY    5
    FRIDAY        6
    SATURDAY    7
*/

    public static String findDay(int month, int day, int year) {
        String result = "";
        Calendar rightNow = Calendar.getInstance();
        rightNow.set(year, month-1, day);
      
        int dayOfWeek = rightNow.get(Calendar.DAY_OF_WEEK);
        
    
        switch (dayOfWeek){
        case 1 : result = "SUNDAY";
                 break;
        case 2 : result = "MONDAY";
                 break;
        case 3 : result = "TUESDAY";
                 break;
        case 4 : result = "WEDNESDAY";
                 break;
        case 5 : result = "THURSDAY";
                 break;
        case 6 : result = "FRIDAY";
                 break;
        case 7 : result = "SATURDAY";
                 break;
        }
        return result;
    }

}

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();
    }
}

 

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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, , which returns the day on that date. To simplify your task, we have provided a portion of the code in the editor.

Example

The method should return  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    format.

Constraints

•  

Sample Input

08 05 2015

Sample Output

WEDNESDAY

Explanation

The day on August th  was WEDNESDAY.