If I have a folder that contains all of my certificate related files, is it possible to examine the files to determine the expiration of the file?
Or do I have to make an API call to get this information?
Yes it's possible, because the certificate contains that information.
If it's pem encoded:
openssl x509 -enddate -noout -in file.pem
Note: if you want to check the revocation of the certificate, you can do it on https://crt.sh
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