Countdown Clock - After Effects Expression by Animoplex

CountdownClock.jsx

// Countdown Clock
// Original: http://www.motionscript.com/design-guide/up-down-clock.html

rate = -1;
clockStart = 3.00;
sign = "";
function padZero(n) {
    if (n < 10) {
        return "0" + n
    }
    else {
        return "" + n
    }
}
clockTime = clockStart + rate * (time - inPoint);
if (clockTime < 0) {
    sign = "-"; clockTime = -clockTime;
}
t = Math.floor(clockTime);
min = Math.floor((t % 3600) / 60);
sec = Math.floor(t % 60);
ms = clockTime.toFixed(3).substr(-3);
sign + ":" + padZero(min) + ":" + padZero(sec) + "." + ms