Angelina K. saw this message come in and kind of marinated on it - and a lightbulb just went off.
What if you brought in a richtext field and hid it either with positioning (off screen) or with opacity or anything really. You may not be able to use display: none; though but test it with that first.
So if the richtext field is in the DOM - the attributes will pick up on it, calculate, and then you can display that time within those cards on any page.
Does that make sense? If not, I can do a quick loom.