When the new certificate check analyzes the certificate chain, the value “validity” in the details contains several numbers:
The 65 is obviously the number of days left on the certificate itself. What are the other numbers? In this example, the next certificate in the chain is the Let’s Encrypt intermediate that is valid until 2027-03-13. The root certificate is ISRG Root X1, valid until 2030-06-04. I don’t seen any connection to the numbers 28 and 7.