ActionScript 3.0 :: Change Mc Based On Day Of The Week?

I'm working on a lil' animated weekly meal plan that'll be played in my school's cafeteria. It gets the meal info from an external text file that the staff update every weekend for the coming week.Preface: I know my way around Flash relatively well, but don't have any formal training or much experience with Action Script.

What I would like to do is to automatically highlight the meals for the current day via Action Script. It drives me crazy that I know this is possible, most likely not overly complex, and that I've got all the basic elements assembled already.The problem is that I don't know the Syntax that would allow me to put it all together and get it working.I can create an array for the days of the week and trace the result, like so:

ActionScript Code:
var days:Array = ["0", "1", "2", "3", "4", "5", "6"];
var my_date:Date = new Date();
trace(days[my_date.day]);

Now I'd like to take the result, number representing the day of the week, and see if that is the current day. If so, I'd like this result to cause the alpha of my background MC to change (I'm doing this via TweenMax):

ActionScript Code:
if day == 0 //Day is Sunday
TweenMax.to(bg0, 2, {alpha:0.9});  // change the alpha of "bg0" to 0.9
else

[code]....

And lastly, since the computer running the swf is being turned off every night and back on every morning I don't really need this run at a certain interval (i.e. every 24 hours), correct?