Simple Date "Calculator"

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner dateInput = new Scanner(System.in);

        String date;
        System.out.print("What is the date? ");
        date = dateInput.next();



        String[] daysOfWeek = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
        String[] dayNumber = { "0", "1", "2", "3", "4", "5", "6"};

        int i = Integer.parseInt(date);
        if(Integer.parseInt(date) < 7) {
            i = Integer.parseInt(date);
        }
        else if (Integer.parseInt(date) >= 28 && Integer.parseInt(date) <= 31){
            i = i - 28;
        }
        else if (Integer.parseInt(date) >= 21 && Integer.parseInt(date) <= 27){
            i = i - 21;
        }
        else if (Integer.parseInt(date) >= 14 && Integer.parseInt(date) <= 20){
            i = i - 14;
        }
        else if (Integer.parseInt(date) >= 7 && Integer.parseInt(date) <= 13){
            i = i - 7;
        }

        else {
            System.out.println("Error with i");
        }


        int d = Integer.parseInt(dayNumber[i]);

        // Replies with date and day.

        if(Integer.parseInt(dayNumber[d]) <= 6 ) {
            System.out.println("The " + date + " is a " + daysOfWeek[d]);
        }

        else {
           System.out.println("Error with reply");
        }
    }