Assignemnt #96 and Weekday Calculator

Code

/// Name: Raff Lisbona
/// Period: 6
/// Program Name: Weekday Calculator
/// File Name: WeekdayCalculator.java
/// Date Finished: 2/25/2016
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. Lisbona'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;
        total = yy + total;
        total = total + dd;
        total = monthOffset(mm) + total;
        if ( isLeap(yyyy) == true && mm == 1 || mm == 2)
            total = total - 1;
        total = total % 7;
		date =weekday_name(total) + ", " + month_name(mm) + " " + dd + ", " + yyyy;

		return date;
	}
    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 month_name( int month_name )
	{
		String result;
		if ( month_name == 1 )
            result = "January";
        else if ( month_name == 2 )
            result = "February";
        else if ( month_name == 3 )
            result = "March";
        else if ( month_name == 4 )
            result = "April";
        else if ( month_name == 5 )
            result = "May";
        else if ( month_name == 6 )
            result = "June";
        else if ( month_name == 7 )
            result = "July";
        else if ( month_name == 8 )
            result = "August";
        else if ( month_name == 9 )
            result = "September";
        else if ( month_name == 10 )
            result = "October";
        else if ( month_name == 11 ) 
            result = "November";
        else if ( month_name == 12 )
            result = "December";
        else 
            result = "error";
		
		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 = "Sunday";
        }
        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