Hello @Marie_Lunney1
Welcome to the forum.
I think what you are trying to achieve can be obtained by implementing one of these forumals that @Richard_Sather listed here.
Check them out: 📆 How you can use the Today input in Advanced Formulas, today!
The forumals do not target the priority per se, but you might be able to customise them to achieve the result without having zero as a multiplier.
Hope this helps a bit.
Rashad