title: how to add time in java.sql.Timestamp
body: <p>How to add 3 hours to the time that store in <code>java.sql.Timestamp</code> by not using the deprecated API?</p>
  
  <p>I use the below code, but it doesn't work.</p>
  
  <pre><code>Timestamp later = new Timestamp(old + (1000 * 60 * 60 * 3));
  </code></pre>