Is there a reason that you have to use the FTP server to do this? There's a couple of other ways that is, perhaps, easier depending on the environment.
For example, it's relatively easy to write a shell script to generate an HTML file to be served up from a web server. Attach that shell script to a CRON job running once per day (or once per hour, etc.).
Alternatively, you can write a dynamic page in PHP, Perl, JSP, Java, etc. and have them served up by the appropriate server type (for example, Apache for PHP or Perl, Tomcat for JSP or Java Servlets, etc.).