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by stevekemp 3672 days ago
If you clone my sysadmin utilities, from here:

https://github.com/skx/sysadmin-util

You'll find:

     $ ssl-expiry-date bbc.co.uk
     bbc.co.uk
        Expires: Mar 15 17:01:06 2017 GMT
        Days: 289
That uses openssl, bash, and other standard facilities available upon Unix/Linux systems.