zeller.java

// Java program to  Find the Day
// for a Date
import java.util.*;
import java.io.*;
 
public class zeller {
    // Print Day for a Date
    public static void Zellercongruence(int day, int month, int year) {
        if (month == 1){
            month = 13;
            year--;
        } if (month == 2) {
            month = 14;
            year--;
        }
        int q = day;
        int m = month;
        int k = year % 100;
        int j = year / 100;
        int h = q + 13*(m + 1) / 5 + k + k / 4 + j / 4 + 5 * j;
        h = h % 7;
        switch (h) {
            case 0 : {
                System.out.println("Saturday"); 
                break;
            }
            case 1 : {
                System.out.println("Sunday"); 
                break;
            }
            case 2 : {
                System.out.println("Monday"); 
                break;
            }
            case 3 : {
                System.out.println("Tuesday"); 
                break;
            }
            case 4 : {
                System.out.println("Wednesday"); 
                break;
            }
            case 5 : {
                System.out.println("Thursday"); 
                break;
            }
            case 6 : {
                System.out.println("Friday"); 
                break;
            }
        }
    }
     
    // Driver code
    public static void main(String[] args) {
        Zellercongruence(11, 11, 2022); //date (dd/mm/yyyy)
    }
}