title: log4j: timezone formatting
body: <p>I would like to format the timezone information in log4j messages in the format
  <code>+hh:mm</code> such that a complete timestamp looks like this:</p>
  <pre><code>2013-09-05T09:32:10.703+02:00
  </code></pre>
  <p>I know the date format specifier <code>Z</code>, but then the output format is <code>+hhmm</code> and not <code>+hh:mm</code>. So the colon is missing:</p>
  <pre><code>2013-09-10T15:55:34.123+0200
  </code></pre>
  <p>Is there any way to get what I want?</p>