How long will unopened heavy whipping cream last in the fridge

It lasts just shy of forever.  If it smells okay and isn't lumpy, you shouldn't have any problems using it.  (Though I tend to play it safe and use older cream in recipes that call for it to be heated, as opposed to whipping it up and serving it.)

If its ultra pasteurized it will last a long long time. If regular usually a week after date stamped on it

A week past use-by date sounds a bit conservative, Ed. If it's unopened you should get at least several weeks past the use-by date.

Again, folks need to understand the difference between at-home and professional usage. I just dumped three gallons of milk, at work, cuz they didn't rotate the stock (again!), and these were use-by dated January 15.

Do you think for one second I'd have dumped them at home? That sound you hear is my hollow laughter.

Make a cup of coffee. Drizzle a little of the cream in. If it curdles, throw the container out.

KYH.. If you see milk out of date  and you do not want to use Freeze it, You can use for cooking.  And yes if unopened a few weeks but, opened non ultra pasteurized  watch out and depends on temp in fridge and how often fridge opens and closes. Most today are ultra pasteurized .

If you see milk out of date  and you do not want to use Freeze it,

Unfortunately I have no choice, Ed. They insist that we flush it. I'd have gladly taken it home, as it irks me to waste any kind of food. But, good grief! Three gallons of perfectly good milk!

I think, it is 6 months from the date of production or it maybe longer. :)

Like Ed says.  ULTRA PASTEURIZED lasts longer.

great advice about the coffee trick!!  thank you.