After trying it out on your site, I found a small typo in your script. I then checked this with what I posted and it seems that it got changed (not sure how as I copy/pasted this from my AdminCP).
The typo is the second line of both countdown and countup function. The line that fails is
PHP Code:
y2k = new date(date);
The lowercase d in the first date is causing your problems.
This is part of the code that goes into your Head Insert section.
Below is the correct line for both functions.
I will fix the first post here. Maybe PHP tag is doing this ???
Edit: I just tried the [ code ] tag to post the correct line and it did it again

Both PHP and CODE tags are making this line appear incorrect.
y2k = new Date(date);
Admins/Mods,
I'm not sure how I can fix this so the members can see the code.
Help Please.
Kevin