title: length of System.currentTimeMillis
body: <p>Does <code>System.currentTimeMillis</code> always returns a fixed length of value. In my windows Core2, it return a 13 digit long value. </p>
  
  <p>From its API:</p>
  
  <blockquote>
    <p>Returns the current time in milliseconds. Note that while the unit of time of the return value is a millisecond, the granularity of the value depends on the underlying operating system and may be larger. For example, many operating systems measure time in units of tens of milliseconds.</p>
  </blockquote>