Quick tip:
If you want to expand the refrigerator life of cream, transfer it from the carton to a sealable jar.
When we get a liter of cream, either whipping cream or heavy cream, the first thing we do is transfer it to a mason jar with a lid and ring. We use those because we have tons of them from canning preserves, but any sealable jar with a good lid will work.
Doing this will help keep the air from causing spoilage, and will create a barrier that will help keep the cream from absorbing refrigerator odors from other foods.
After transferring the only thing to get in the habit of doing is wiping the jar rim after pouring to avoid cream crust which will interfere with the seal between the jar and lid.
We've found that doing this can extend the life of our cream by up to a month, sometimes more.