handling of expired certificates

[Vijaya Venkatachalam]

Hi
 
I am new to openssl application development.
I had a question on how to handle expired certificates.
 
So at the time of openssl connection establishment, the certificate is valid.
But while the connection is still up, the certificate expires.
 
Is the application supposed to handle this or does openssl handle this?
 
what should be the application behavior on certificate expiry?
 
Thanks,
Vijaya