It’s April 12, 2007, Fabrikam Day! As Brian Connell pointed out on the GP Newsgroup, today is the day that the Fabrikam demo company for GP defaults to. You still get the annoying message buy for today only, the date is correct!
Happy Fabrikam Day!
Archived post from 2007. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.