Ant: How to select the latest modified file from a directory?

You can do that with the TimestampSelector task from ant-contrib.

<timestampselector property="latest.modified">
  <path>
    <fileset dir="${my-directory.dir}">
      <include name="file-*" />
    </fileset>
  </path>
</timestampselector>

<echo message="${latest.modified}" />