这个时间戳文件是如何从maven build生成的？

<build>
  <plugins>
    <plugin>
      <groupId>org.codehaus.mojo</groupId>
      <artifactId>buildnumber-maven-plugin</artifactId>
      <version>1.4</version>
      <executions>
        <execution>
          <id>generate-timestamp</id>
          <phase>validate</phase>
          <goals>
            <goal>create</goal>
          </goals>
        </execution>
      </executions>
      <configuration>
        <format>{0,date,yyyyMMdd-HHmmss}</format>
        <items>
          <item>timestamp</item>
        </items>
        <doCheck>false</doCheck>
        <doUpdate>false</doUpdate>
      </configuration>
    </plugin>
  </plugins>
</build>