build.xml

 <project name="genTestReport" default="gen" basedir=".">
        <description>
                Generate the HTML report from JUnit XML files
        </description>

        <target name="gen">
                <property name="genReportDir" location="${basedir}/unitTestReports"/>
                <tstamp>
                <format property="time.stamp" pattern="yy-MM-dd_HHmmss"/>
                </tstamp>         
                <mkdir dir="${genReportDir}"/>
                <junitreport todir="${basedir}/unitTestReports">
                        <fileset dir="${basedir}">
                                <include name="**/TEST-*.xml"/>
                        </fileset>
                        <report format="frames" todir="${genReportDir}/${time.stamp}"/>
                </junitreport>
        </target>
</project>