Arbitrary date does not update

I set an arbitrary date for last Friday and it gives me the correct date for last Friday but a week later when I’m using my app it’s still stuck on the original date that was set and does not automatically update

Yep, arbitrary date is letting you select a specific date and time, its not dynamic.

You want to use the Current date, and then modify, like current date + 7 days etc if you want a live dynamic date