openssl command to check certificate expiry date

first find where openssl is located(if it is not in your .profile file)

to find where this command is . use following
find . -name openssl

than go to that directory and run following command to find out about certificate expiry date.

 ./openssl x509 -in /oam/identity/oblix/config/aaa_cert.pem -noout -enddate

output
notAfter=Dec 23 06:23:45 2014 GMT