title: How to access maven.build.timestamp for resource filtering
body: <p>I am using maven 3.0.4 and would like to make the build timestamp accessible to my application. For this, I'm putting a placeholder in a <code>.properties</code> file and let maven filter on build. While this is working fine for <code>${project.version}</code>, <code>${maven.build.timestamp}</code> is not substituted on filtering. </p>
  
  <p>The property seems to be available on build - I can use it to modify the artifact name: </p>
  
  <p><code>&lt;finalName&gt;${project.artifactId}-${maven.build.timestamp}&lt;/finalName&gt;</code></p>
  
  <p>So why is it not available for resource filtering? And, more importantly, how do I make it accessible?</p>