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; import java.time.DayOfWeek;

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) {
  LocalDate date = LocalDate.of(year, month, day);
  DayOfWeek dayOfWeek = date.getDayOfWeek();
  return dayOfWeek.toString();
} 

}

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();
}

}

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
 */

public static String findDay(int month, int day, int year) {
        Calendar calendar = Calendar.getInstance();
    calendar.set(year, month - 1, day); // Calendar months are 0-based
    int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);

    // Array of day names in uppercase
    String[] days = { "SUNDAY", "MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", "FRIDAY", "SATURDAY" };
    return days[dayOfWeek - 1];
}

import java.time.LocalDate; import java.time.DayOfWeek;

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) {
    LocalDate firstDay = LocalDate.of(year, month, day);
    DayOfWeek firstDOW = (DayOfWeek) firstDay.getDayOfWeek();
    return String.valueOf(firstDOW);
}

** SOLUTION:**

  Calendar c = new GregorianCalendar();
   c.set(year, month-1,day );    

      return (c.getDisplayName(c.DAY_OF_WEEK, Calendar.LONG, Locale.ENGLISH)).toUpperCase();
         

This will definitely help me understand how to handle date and time operations in Java better. Thanks again for taking the time to share this! Matchbox 9