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How to view the expiry date of an ssl certificate on crt file

openssl x509 -noout -in wildcard.ashishnepal.com.crt -dates

notBefore=Aug 21 16:43:10 2011 GMT
notAfter=Aug 21 16:43:10 2014 GMT

How to view the expiry date of an ssl certificate on domain

openssl s_client -connect kb.ashishenpal.com:443 | openssl x509 -text

[You would see this section before public key Fingreprint]
Validity
Not Before: Jan 29 00:00:00 2010 GMT
Not After : Jan 28 23:59:59 2014 GMT

I came across Very nice script provided by Matty, which is available at http://prefetch.net/code/ssl-cert-check
and http://prefetch.net/articles/checkcertificate.html this script does exactly what you would be looking for.

SSL Checker

Using this script you could get verity of options where simply you can create a list of domain inside a file and read file . Here ssl_spy.sh is this ssl_checker script, ssl_check.txt is the file which contains all those domain i want to check and wheel@tikejhya.com is my email address where i want to get notified, -f is option for file read and -q is quite -x is time if less than 60 it will notify me in given email.

/bin/bash /home/tikejhya/bin/ssl_spy.sh -a -f /home/tikejhya/bin/ssl_check.txt -q -x 60 -e wheel@tikejhya.com