title: Date arithmetic in Java, adding 3 months from today
body: <p>My program is about generating (producing) a Kurosawa and making the customers produce it.</p>
  
  <p>Every time we generate a Kurosawa, we have to print its id, its production date and expiration date, which is 3 months from the production date. </p>
  
  <p>My problem is: <em>How can I calculate the date after 3 months?</em> </p>