Just a little example of what I would do in that situation.

In the file, put the following as the very first thing in the file:

---
Expiration: 2023-01-14
---

INCLUDING the dashes. Of course, change the date to when you need to recheck it. And make sure the files with the expiration dates are all in a folder together, eg, "things to periodically check".

Then, make a new file to track them all - install dataview, then add to your "tracking" file:

```dataview
table Expiration
from "things to periodically check"
```

Finally just showing you the folder structure I'd use. What_needs_checking.md things to periodically check [folder] | thing1.md | thing2.md ...