AssFace,
I think merlyn, and others, are right for a different reason. Even though there is no universal Holiday schedule, you could possibly find, or more likely, build your own that fits your situation. What is the problem with that?

Automation is only as smart as the person who programmed it.

During the 9/11 tragedy the markets were closed for an "un-scheduled outage". If your code can't efficiently determine that today is a down day - you will eventually end up having your script waste time and resources.

Cheers - L~R