If Else Statement not working?

Hey,

Before the 2019 update for After Effects, my expression for a countdown clock was working a treat. Now the If else statement seems to have had a definition change and I can't seem to find where the issue is. Does anyone have an idea of what could be happening?

Here is the original expression:

rate = -1;

clockStart = 899.97;

function padZero(n){

if (n < 10) return "0" + n else return n;

}

clockTime = Math.max(clockStart + rate*(time - inPoint),0);

t = Math.floor(clockTime);

min = Math.floor((t%3600)/60);

sec = Math.floor(t%60);

msec = clockTime.toFixed(2).substr(-2);

padZero(min) + ":" + padZero(sec) + ":" + msec;

Thanks