Day Finder

package test.file;

import java.math.*;
import java.util.Scanner;

public class TestFile {

    public static boolean ly(int d, int m, int y)
    {
        if (((y%4==0) && (y%100!=0)) || (y%400==0)){
            if(m==2 && d>=29) return true;
            else if(m>2) return true;
            else return false;
        }
        else return false;
    }

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        String[] ar = new String[14];
        ar[4]="Saturday";
        ar[5]="Sunday ";
        ar[6]="Monday ";
        ar[0]="Tuesday";
        ar[1]="Wednesday";
        ar[2]="Thursday";
        ar[3]="Friday";

        int[] mnth = new int[14];
        mnth[0]=0;
        mnth[1]=31;
        mnth[2]=mnth[1]+28;
        mnth[3]=mnth[2]+31;
        mnth[4]=mnth[3]+30;
        mnth[5]=mnth[4]+31;
        mnth[6]=mnth[5]+30;
        mnth[7]=mnth[6]+31;
        mnth[8]=mnth[7]+31;
        mnth[9]=mnth[8]+30;
        mnth[10]=mnth[9]+31;
        mnth[11]=mnth[10]+30;
        mnth[12]=mnth[11]+31;

        System.out.print("Please Enter in yyyy-mm-dd formate: ");
        String s=scan.next();

        char[] ch = s.toCharArray();

        int d=0, y=0, m=0;
        y=((ch[0]-'0')*1000)+((ch[1]-'0')*100)+((ch[2]-'0')*10)+(ch[3]-'0');
        m=((ch[5]-'0')*10)+(ch[6]-'0');
        d=((ch[8]-'0')*10)+(ch[9]-'0');

        int days=0;
        int temp=y-2019;
        days+=temp*365;
        if(y>2020 && y<2024) days++;
        days+=(temp-1)/4;
        days+=mnth[m-1];
        if(ly(d,m,y)==true) days++;
        days+=d-1;

        temp=days%7;

        System.out.println("The day is "+ar[temp]);
    }

}