SSL Checker

1 This SSL Checker will help you diagnose problems with your SSL certificate installation.
You can go to
http://www.sslshopper.com/ssl-checker.html
input your server name, you can get information when your SSL will expire
 and which company (such as StartCom) issued the certificate.
2) Another method:

wget http://prefetch.net/code/ssl-cert-check

./ssl-cert-check -s gmail.com -p 443

(replace gmail.com to your sever)

3) Method 3: Click at the beginning of web address in the navigation bar

to get SSL information.

Reference: 

1. What is SSL and what are Certificates? 

2.https://www.startssl.com/