I have an HTML page with data that is updated once a day at 5pm. Ultimately I would like mod_expires to be able to expire this web page every Monday - Friday at 5pm, and will settle for expiring .html file daily at 5pm. Diving deeper, the main HTML file is index.html and the daily updated file is mosaic.html which is a Server Side Include file, <!--#include virtual="mosaic.html"-->. The end user / browser never sees mosaic.html directly. Alternatively, if mod_expires could use the most recent modification time of any file that is server side included (e.g. mosaic.html), an ExpiresDefault "modification plus 1 day" rule might be able to solve this use case.