Jquery if date run function

Jquery if date run function

Hey guys

I ran into a bit of a snag.
I have written a Jquery code to overlay my page for the CISPA blackout(Yes I am one of those people lol).

My issue is I can't find any answer on Google as to how to activate the script on a given date.
I do not want my site blacked out every day but rather if Jquery detects todays date is 4/22/2013 then the script runs, if not then it does nothing.

How do I achieve this?