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You 'could' use the ability of NCM to download other config output than just 'running' and 'startup', so the following would be available to you:
1. Create a new config type (NCM Settings > configs)
2. Add a new entry for 'crypto pki cert' (you do not need the show, as this will be pre-pended by NCM)
3. Create a Policy report which looks for the output line and uses Regex to identify expire time
I have to say the use of SAM is so much easier for this purpose, but hopefully the above will get you along right path.
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Thank you Mark!