title: log4j ConversionPattern timestamp with microseconds
body: <p>I want to add microseconds in the timestamp of each entry of my log files generated with log4j, is it possible ?</p>
  
  <p>I have searched in the official documentation but there are no mention of unit below the milliseconds. </p>
  
  <p>Now i have a conversion pattern like the following : </p>
  
  <pre><code>%d{dd/MM/yyyy HH\:mm\:ss,SSS} %-5p [%t] - %m%n
  </code></pre>
  
  <p>in the date conversion pattern(<strong>%d</strong>) i want to add <strong>microseconds</strong> after the milliseconds value(<strong>SSS</strong>), is there a way to do it ?  </p>