DaysBetweenTwoDates.java

import java.util.*;

public class DaysBetweenTwoDates {

    /**
    *   Program:    DaysBetweenTwoDates.java
    *   Purpose:    Calculate the number of days between date1 and date2.
    *   Creator:    Chris Clarke
    *   Created:    10.10.2013
    */

    public static void main(String[] args) {
        int d1, m1, y1;
        int d2, m2, y2;
        int days = 0;
        Scanner keybd = new Scanner(System.in);
        System.out.println("Please enter first (start) date.");
        System.out.print("Enter day: ");
        d1 = keybd.nextInt();
        System.out.print("Enter month(1-12): ");
        m1 = keybd.nextInt();
        System.out.print("Enter year(4 digits): ");
        y1 = keybd.nextInt();

        System.out.println("Now enter second (end) date.");
        System.out.print("Enter day: ");
        d2 = keybd.nextInt();
        System.out.print("Enter month(1-12): ");
        m2 = keybd.nextInt();
        System.out.print("Enter year(4 digits): ");
        y2 = keybd.nextInt();

        GregorianCalendar date1 = new GregorianCalendar(y1, m1-1, d1);
        GregorianCalendar date2 = new GregorianCalendar(y2, m2-1, d2);

        while (date1.before(date2)) {
            date1.add(Calendar.DAY_OF_MONTH, 1);
            days++;
        }//end while

        System.out.println("There are "+days+" days between the dates.");
    }//end main()
}//end class