"this provides me a number of days remaining however it does not update"
It doesn't update because the result of that calculation is stored.
To let it update, go to the "Storage Options..." of that calculation and check the box: "Do not store..."
Also, use a field of type calculation. Do not set up a date field with this expression as an auto-entered calculation.
That did it!
Thanks so much for the help
Wish I'd found this post three days ago! Ugh, one checkmark!