Automatically go to after hours for holidays

There should be a feature to just toggle holidays on or off. So when the next holiday comes up if it is on, calls automatically go to the after hours message. Currently I've been told you have to create a rule for each holiday with each date and time by going through multiple steps in a wizard. And the dates change yearly so you'd have to remember to change them once a year. I do support for this small business with 3 phones basically just as needed for little to no money. So I set everything and forget it until something has to change. Software should easily understand the 12 yearly federal holidays and accomodate them if you chose to.