Nevermind, it was easy to generate a new cert.  In putty logged into root to the control station:  # /nas/sbin/nas_ca_certificate -generate  Now I was able to be prompted for a new cert that expires in 2019 and accept always for this session.
I cannot manage a celerra that I have here.  If I try to connect to it in Unisphere or USM (to do a software upgrade), I get an error popup that says "Certificate has invalid date".  My only options are details, reject or help.  There is no button to "continue anyway".  The CN that is our name is valid to Thu May 07 08:28:45 EDT 2015.  The CN that is emcnas_i0, O=Celerra Certificate Authority is valid to Tue Jul 08 00:31:08 EDT 2014 (which is past).  How can I regenerate a new certificate without a web interface to do so?  
Cannot manage celerra- Certificate has invalid date