Would you mind to give some examples?
Here is an article from the FTC and one about NIST guidelines.
https://www.ftc.gov/news-events/blogs/techftc/2016/03/time-r...
https://qz.com/981941/the-us-standards-office-wants-to-do-aw...
do you write custom rules based on your actual application? <- not a real question