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Retrieve SSL certificate expiration date

There are several ways to extract the expiration date from the certificate file. Here is one of the easiest way if you have the file locally:
# openssl x509 –noout –in < cert_file >  -dates
[root@mysystem][/opt/certificates]> openssl x509 -noout -in private_key -dates
notBefore=Jul 14 16:23:57 2010 GMT
notAfter=Jul 14 16:23:57 2012 GMT
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