Assignment #96 and Weekday Calculator

Code

    /// Name: Brendan Baird
    /// Period: 6
    /// Program Name: Weekday Calculator
    /// File Name: WeekdayCalculator.java
    /// Date Finished: 1/5/2016
    
    import java.util.Scanner;

    public class WeekdayCalculator
    {
    	public static void main( String[] args )
    	{
    		Scanner keyboard = new Scanner(System.in);
    
    		System.out.println("Welcome to Brendan'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();
    
    		// put a function call for weekday() here
    		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 = "";
    
    		// bunch of calculations go here
            yy = yyyy - 1900;
            total = (yy/4) + yy + dd;
            total = monthOffset(mm) + total;
            
            if (isLeap(yyyy) == true)
            {
                if (mm == 1 || mm == 2)
                {
                    total--;
                }
            }
            
    		date = weekday_name(total % 7) + ", " + monthName(mm) + " " + dd + ", " + yyyy;
    
    		return date;
    	}
    
    
    	// paste your functions from MonthName, WeekdayName, and MonthOffset here
        public static String monthName( int month )
        {
            String result;
    
            if (month == 1)
                result = "January";
            else if (month == 2)
                result = "February";
            else if (month == 3)
                result = "March";
            else if (month == 4)
                result = "April";
            else if (month == 5)
                result = "May";
            else if (month == 6)
                result = "June";
            else if (month == 7)
                result = "July";
            else if (month == 8)
                result = "August";
            else if (month == 9)
                result = "September";
            else if (month == 10)
                result = "October";
            else if (month == 11)
                result = "November";
            else if (month == 12)
                result = "December";
            else
                result = "ERROR";
    
            return result;
        }
        
        public static int monthOffset( int month )
        {
            int result;
    
            if (month == 1)
                result = 1;
            else if (month == 2)
                result = 4;
            else if (month == 3)
                result = 4;
            else if (month == 4)
                result = 0;
            else if (month == 5)
                result = 2;
            else if (month == 6)
                result = 5;
            else if (month == 7)
                result = 0;
            else if (month == 8)
                result = 3;
            else if (month == 9)
                result = 6;
            else if (month == 10)
                result = 1;
            else if (month == 11)
                result = 4;
            else if (month == 12)
                result = 6;
            else
                result = -1;
    
            return result;
        }
    		
        public static String weekday_name( int weekday )
        {
            String result = "";
    
            if ( weekday == 1 )
            {
                result = "Sunday";
            }
            else if ( weekday == 2 )
            {
                result = "Monday";
            }
            else if ( weekday == 3 )
            {
                result = "Tuesday";
            }
            else if ( weekday == 4 )
            {
                result = "Wednesday";
            }
            else if ( weekday == 5 )
            {
                result = "Thursday";
            }
            else if ( weekday == 6 )
            {
                result = "Friday";
            }
            else if ( weekday == 7 )
            {
                result = "Saturday";
            }
            else if ( weekday == 0 )
            {
                result = "Saturday";
            }
            else
            {
                result = "error";
            }
    
            return result;
        }
        
    	public static boolean isLeap( int year )
    	{
    		// years which are evenly divisible by 4 are leap years,
    		// but years divisible by 100 are not leap years,
    		// though years divisible by 400 are leap years
    		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