Countdown clock

1

Hi
i am working on a website that includes a monthly countdown clock to a lottery draw.
To achieve this i have used a video tutorial from learnflash.com and th code as below:

this.onEnterFrame = function() {

var today:Date = new Date();
var currentYear = today.getFullYear();
var currentTime = today.getTime();

var targetDate:Date = new Date(2008,2,30);
var targetTime = targetDate.getTime();

var timeLeft = targetTime - currentTime;

var sec = Math.floor(timeLeft/1000);
var min = Math.floor(sec/60);
var hrs = Math.floor(min/60);
var days = Math.floor(hrs/24);
sec = string(sec % 60);
if (sec.length < 2) {
    sec = "0" + sec;
}
min = string(min % 60);
if (min.length < 2) {
    min = "0" + min;
}
hrs = string(hrs % 24);
if (hrs.length < 2) {
    hrs = "0" + hrs;
}
days = string(days);

var counter:String = days + ":" + hrs + ":" + min;
time_text.text = counter;

}

i was wondering if anyone knew how to edit this so that i can specify a time on the target date…at the moment it counts down to the day itself ie. midnight the day before. If i wanted to specify midday or something how might i do this?

thanks.