title: Calculating days between two dates with Java
body: <p>I want a Java program that calculates days between two dates.</p>
  
  <ol>
  <li>Type the first date (German notation; with whitespaces: "dd mm yyyy")</li>
  <li>Type the second date.</li>
  <li>The program should calculates the number of days between the two dates.</li>
  </ol>
  
  <p>How can I include leap years and summertime?</p>
  
  <p>My code:</p>
  
  <pre><code>import java.util.Calendar;
  import java.util.Date;
  import java.util.Scanner;
  
  public class NewDateDifference {
  
      public static void main(String[] args) {
  
          System.out.print("Insert first date: ");
          Scanner s = new Scanner(System.in);
          String[] eingabe1 = new String[3];
  
          while (s.hasNext()) {
              int i = 0;
              insert1[i] = s.next();
              if (!s.hasNext()) {
                  s.close();
                  break;
              }
              i++;
          }
  
          System.out.print("Insert second date: ");
          Scanner t = new Scanner(System.in);
          String[] insert2 = new String[3];
  
          while (t.hasNext()) {
              int i = 0;
              insert2[i] = t.next();
              if (!t.hasNext()) {
                  t.close();
                  break;
              }
              i++;
          }
  
          Calendar cal = Calendar.getInstance();
  
          cal.set(Calendar.DAY_OF_MONTH, Integer.parseInt(insert1[0]));
          cal.set(Calendar.MONTH, Integer.parseInt(insert1[1]));
          cal.set(Calendar.YEAR, Integer.parseInt(insert1[2]));
          Date firstDate = cal.getTime();
  
          cal.set(Calendar.DAY_OF_MONTH, Integer.parseInt(insert2[0]));
          cal.set(Calendar.MONTH, Integer.parseInt(insert2[1]));
          cal.set(Calendar.YEAR, Integer.parseInt(insert2[2]));
          Date secondDate = cal.getTime();
  
  
          long diff = secondDate.getTime() - firstDate.getTime();
  
          System.out.println ("Days: " + diff / 1000 / 60 / 60 / 24);
      }
  }
  </code></pre>