Hey CF,
It is the same up to 4.0(5) anyways, have a look;
Holiday Settings
When a Holiday setting is in effect, Cisco Unity plays closed greetings and observes closed transfer rules. You can set up several years of holidays at a time, and you can copy the holidays from one year to the next, adjusting dates as necessary. Because many holidays occur on different dates each year, confirm that the holiday schedule remains accurate annually.
From this 4.0(5) doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_administration_guide_chapter09186a0080443b5e.html#wp1548625
Hope this helps!
Rob
