title: Log4net generating wrong log file name
body: <p>I want to create log files names with the following pattern:</p>
  
  <pre><code>SBRF_20120820.log
  SBRF_20120821.log
  SBRF_20120822.log
  SBRF_20120823.log
  </code></pre>
  
  <p>In other words, create a new file for each day. So, I create the following configuration to do that:</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;log4net&gt;
      &lt;appender name="FileAppender" type="log4net.Appender.RollingFileAppender, log4net"&gt;
          &lt;file type="log4net.Util.PatternString" value="Logs/SBRF_%date{yyyyMMdd}.log" /&gt;
          &lt;appendToFile value="true" /&gt;
          &lt;rollingStyle value="Date" /&gt;
          &lt;layout type="log4net.Layout.PatternLayout"&gt;
              &lt;conversionPattern value="%date %-5level - %message%newline" /&gt;
          &lt;/layout&gt;
      &lt;/appender&gt;
      &lt;logger name="LogEmArquivo"&gt;
          &lt;level value="INFO" /&gt;
          &lt;appender-ref ref="FileAppender" /&gt;
      &lt;/logger&gt;
  &lt;/log4net&gt;
  </code></pre>
  
  <p>When I run the program, today for example, the file <code>SBRF_20120823.log</code> will be created. But in the following days the log keeps to write in the <code>SBRF_20120823.log</code> file, and the files that are created are:</p>
  
  <pre><code>SBRF_20120823.log.2012-08-23
  SBRF_20120823.log.2012-08-24
  SBRF_20120823.log.2012-08-25
  SBRF_20120823.log.2012-08-26
  </code></pre>
  
  <p>And if I run the program tomorrow, the files that will be created are:</p>
  
  <pre><code>SBRF_20120824.log.2012-08-24
  SBRF_20120824.log.2012-08-25
  SBRF_20120824.log.2012-08-26
  SBRF_20120824.log.2012-08-27
  </code></pre>
  
  <p>Why? </p>