title: System.currentTimeMillis(); If I change system time
body: <p>If I use <code>System.currentTimeMillis()</code> at 00:00 and I get <code>X</code> value.</p>
  
  <p>Then I set the clock back one hour, and after one hour i call <code>System.currentTimeMillis()</code>.</p>
  
  <p>Will it return <code>X</code> again, or will it just be <code>X + 3600 * 1000</code></p>