Added Java Date and Time Solution and Updated Readme

Java/Introduction/DateTime.java

@@ -0,0 +1,60 @@
+// Problem - https://www.hackerrank.com/challenges/java-date-and-time/problem?isFullScreen=true
+// Score - 15
+// Difficulty - Easy
+
+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.util.Calendar;
+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   import java.util.Calendar;   import java.util.Calendar;
+     */
+
+    public static String findDay(int month, int day, int year) {
+        Calendar cal=Calendar.getInstance();
+        String dd[]={"SUNDAY","MONDAY","TUESDAY","WEDNESDAY","THURSDAY","FRIDAY","SATURDAY"};
+        cal.set(year,month-1,day);
+        int n=cal.get(Calendar.DAY_OF_WEEK);
+        return dd[n-1];
+    }
+
+}
+
+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();
+    }
+}

README.md

@@ -181,6 +181,7 @@
 | S.No. | Problem | Solution | Score | Difficulty |
 |--|--|--|--|--|
 | 1 | [Java Stdin and Stdout](https://www.hackerrank.com/challenges/java-stdin-stdout/problem) | [Solution]() | 10 | Easy |
+| 2 | [Java Date and Time](https://www.hackerrank.com/challenges/java-date-and-time/problem?isFullScreen=true) | [Solution](https://github.com/Riddhi9570/HackerrankPracticeProblems/blob/main/Java/Introduction/DateTime.java) | 15 | Easy |
 
 ### Strings
 | S.No. | Problem | Solution | Score | Difficulty |