Assignment #96 and Weekday Calculator

Code

    /// Name: Ali Kurland
    /// Period: 6
    /// Program Name: Weekday Calculator
    /// File Name: WeekdayCalculator.java
    /// Date Finished: 11/19/2015
    
    import java.util.Scanner;
    
    public class WeekdayCalculator
    {
    	public static void main( String[] args )
    	{
    		Scanner keyboard = new Scanner(System.in);
    
    		System.out.println("Welcome to Ali's amazing Weekday Calculator!");
    		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("\nYou 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 ( isLeap(yyyy) && ( 0 < mm ) && ( mm <= 2 ) )
                total = total - 1;
            int wd = total % 7;
    		date = weekdayName(wd) + ", " + monthName(mm) + " " + dd + ", " + yyyy;
    
    		return date;
    	}
    
        public static String monthName( int mm )
    	{
            String outcome; 
            
            if ( mm == 1 )
            outcome = "January";
            else if ( mm == 2 )
            outcome = "February";
            else if ( mm == 3 )
            outcome = "March";
            else if ( mm == 4 )
            outcome = "April";
            else if ( mm == 5 )
            outcome = "May";
            else if ( mm == 6 )
            outcome = "June";
            else if ( mm == 7 )
            outcome = "July";
            else if ( mm == 8 )
            outcome = "August";
            else if ( mm == 9 )
            outcome = "September";
            else if ( mm == 10 )
            outcome = "October";
            else if ( mm == 11 )
            outcome = "November";
            else if ( mm == 12 )
            outcome = "December";
            else
            outcome = "error";
            
            return outcome;
    	}
        
        public static String weekdayName( int wd )
        {
            String name;
            
            if ( wd == 1 )
                name = "Sunday";
            else if ( wd == 2 )
                name = "Monday";
            else if ( wd == 3 )
                name = "Tuesday";
            else if ( wd == 4 )
                name = "Wednesday";
            else if ( wd == 5 )
                name = "Thursday";
            else if ( wd == 6 )
                name = "Friday";
            else if ( wd == 0 )
                name = "Saturday";
            else 
                name = "error";
                
            return name;
        }
        
        public static int monthOffset( int mm )
        {
            int offset;
    
            if ( mm == 1 )
                offset = 1;
            else if ( mm == 2 )
                offset = 4;
            else if ( mm == 3 )
                offset = 4;
            else if ( mm == 4 )
                offset = 0;
            else if ( mm == 5 )
                offset = 2;
            else if ( mm == 6 )
                offset = 5;
            else if ( mm == 7 )
                offset = 0;
            else if ( mm == 8 )
                offset = 3;
            else if ( mm == 9 )
                offset = 6;
            else if ( mm == 10 )
                offset = 1;
            else if ( mm == 11 )
                offset = 4;
            else if ( mm == 12 )
                offset = 6;
            else
                offset = -1;
    
            return offset;
        }
    		
    	public static boolean isLeap( int yyyy )
    	{
    		boolean result;
    
    		if ( yyyy%400 == 0 )
    			result = true;
    		else if ( yyyy%100 == 0 )
    			result = false;
    		else if ( yyyy%4 == 0 )
    			result = true;
    		else
    			result = false;
    		
    		return result;
    	}
    }
    

Picture of the output