Do you think technically competant people....
....reads anything on a website on the First of April??
I assume most take the morning off, and just to be on the safe side take the entire day off as a sickie.
Even if they have left surprisings in the style of the BOFH, it's usually a good idea to be far away or at least in communicado (a country in Spain I think) so why keep making up stuff for an arbitrary date on the calendar?