Assignment # 96 and Weekday Calculator

Code

    /// Name: Tommy Oyuntseren
    /// Period: 7
    /// Program Name: WeekdayCalculator
    /// File Name: WeekdayCalculator.java
    /// Date: 3/29/2016

    import java.util.Scanner;
    public class WeekdayCalculator
    
{
	public static void main( String[] args )
	{
		Scanner keyboard = new Scanner(System.in);

		System.out.println("Welcome to Mr. Tommys's fantastic birth-o-meter!");
		System.out.println();
		System.out.println("All you have to do is enter your birth date, and it will");
		System.out.println("tell you the day of the week on which you were born.");
		System.out.println();
		System.out.println("Some automatic tests....");
		System.out.println("12 10 2003 => " + weekday(12,10,2003));
		System.out.println(" 2 13 1976 => " + weekday(2,13,1976));
		System.out.println(" 2 13 1977 => " + weekday(2,13,1977));
		System.out.println(" 7  2 1974 => " + weekday(7,2,1974));
		System.out.println(" 1 15 2003 => " + weekday(1,15,2003));
		System.out.println("10 13 2000 => " + weekday(10,13,2000));
		System.out.println();

		System.out.println("Now it's your turn!  What's your birthday?");
		System.out.print("Birth date (mm dd yyyy): ");
		int mm = keyboard.nextInt();
		int dd = keyboard.nextInt();
		int yyyy = keyboard.nextInt();

		System.out.println("You were born on "+weekday(mm, dd, yyyy));
	}


	public static String weekday( int mm, int dd, int yyyy )
	{
		int yy, total;
		String date = "";

		yy = yyyy-1900;
		total = yy/4 + yy + dd + monthOffset(mm);

		if ((mm==1||mm==2) && isLeap(yyyy)) total--;

		date = weekday_name(total%7)+", "+month_name(mm) +" "+dd+ ", " + yyyy;

		return date;
	}


	static int[] monthoff = {1,4,4,0,2,5,0,3,6,1,4,6};
	public static int monthOffset( int month )
	{
		if (month>0 && month < 13)
			return monthoff[month-1];
		else return -1;
	}

	static String[] months = {"January","February","March","April","May","June","July","August","September","October", "November","December"};
	public static String month_name( int month )
	{
		if (month>0 && month < 13)
			return months[month-1];
		else return "WRONG MONTH NUMBER!!!";
	}

	static String[] days = {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
	public static String weekday_name( int day )
	{
		if (day>-1 && day < 7)
			return days[day-1];
		else return "WRONG DAY NUMBER!!!";
	}
		
	public static boolean isLeap( int year )
	{
		boolean result;

		if ( year%400 == 0 )
			result = true;
		else if ( year%100 == 0 )
			result = false;
		else if ( year%4 == 0 )
			result = true;
		else
			result = false;
		
		return result;
	}
}
   

  

Picture of the output