live-migration

Best way of reliably updating content at a specific time across VARIOUS files and formats?

Let's say I have to push a change live at 8 AM EST on Tuesday May 18th - this change is across various files: xml file php file 30x static html files with no php processing enabled all of these are hosted on a linux server with cron. Is it reliable setting up a cron job to call a script which takes these files, for example: templa...