import java.util.Scanner;
import java.util.InputMismatchException;

public class DateFormat
{
	public static int monthNumber() throws MonthException
	{
		int month = 0;
		Scanner keyboard = new Scanner(System.in);
		try
		{
			System.out.println("Enter month number: ");
			month = keyboard.nextInt();
			if(month <= 0 || month > 12)
				throw new MonthException();
		}
		catch(InputMismatchException e)
		{
			throw new MonthException();
		}
			return month;
	}

	public static int dayNumber() throws DayException
	{
		int day = 0;
		Scanner keyboard = new Scanner(System.in);
		try
		{
			System.out.println("Enter day number: ");
			day = keyboard.nextInt();
			if(day > 31 || day <= 0)
				throw new DayException();
		}
		catch(InputMismatchException e)
		{
			throw new DayException();
		}
			return day;
	}

	public static int yearNumber() throws YearException
	{
		int year = 0;
		Scanner keyboard = new Scanner(System.in);
		try
		{
			System.out.println("Enter year number: ");
			year = keyboard.nextInt();
			if(year > 3000 || year <= 1000)
				throw new YearException();
		}
		catch(InputMismatchException e)
		{
			throw new YearException();
		}
			return year;
	}

	public static String numToString(int month)
	{
		switch(month)
		{
			case 1:
				return "January";
			case 2:
				return "February";
			case 3:
				return "March";
			case 4:
				return "April";
			case 5:
				return "May";
			case 6:
				return "June";
			case 7:
				return "July";
			case 8:
				return "August";
			case 9:
				return "September";
			case 10:
				return "October";
			case 11:
				return "November";
			case 12:
				return "December";
		}
	}

	public class MonthException extends Exception
	{
		public MonthException()
		{
			super("Incorrect month");
		}
		public MonthException(String message)
		{
			super(message);
		}
	}

	public class DayException extends Exception
	{
		public DayException()
		{
			super("Invalid day.");
		}
		public DayException(String message)
		{
			super(message);
		}
	}


	public class YearException extends Exception
	{
		public YearException()
		{
			super("Invalid year.");
		}

		public YearException(String message)
		{
			super(message);
		}
	}
}