Finding the day from a given date using the Tomohiko Sakamoto Algorithm

Sakamoto.java

import java.util.*;
import java.lang.*;
import java.io.*;

class Sakamoto {

	static int sakamotoAlgorithm(int date, int month, int year) {
		
		int[] dateDiff = {0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4};

		if (month < 3)
			year -= 1;

		return (year + year/4 - year/100 + year/400 + dateDiff[month-1] + date) % 7;
		
	}
	
	public static void main (String[] args) {
		
		Scanner scan = new Scanner(System.in);

		Integer date = scan.nextInt();
		Integer month = scan.nextInt();
		Integer year = scan.nextInt();

		int day = sakamotoAlgorithm(date, month, year);

		String[] days = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

		System.out.println(days[day]);
        
	}
}