Maven Groovy Plugin

<plugin>
            <groupId>org.codehaus.groovy.maven</groupId>
            <artifactId>gmaven-plugin</artifactId>
            <executions>
               <execution>
                  <phase>validate</phase>
                  <goals>
                     <goal>execute</goal>
                  </goals>
                  <configuration>
                     <source>
                     import java.util.Date
                     import java.text.SimpleDateFormat
                     def format = new SimpleDateFormat("dd/MM/yyyy");
                     def myothertimestamp = format.format(new Date());
                     project.properties['othertimestamp'] = myothertimestamp
                     </source>
                  </configuration>
               </execution>
            </executions>
         </plugin>