Unix/AIX box - Certificate expiration date check

Run the following openssl command 

echo | openssl s_client -servername NAME -connect HOST:443 2>/dev/null | openssl x509 -noout –dates

Example: If you have a server name ="test.server.com" and port="443"

echo | openssl s_client -servername test.server.com -connect test.server.com:443 2>/dev/null | openssl x509 -noout -dates