With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cspPskcCertStartDate
csp Pskc Cert Start Date
1.3.6.1.4.1.9.9.370.1.4.1.1.13
The time when the certificate starts to be valid, corresponding to the notBefore time on the certificate.
Back to CISCO-SSL-PROXY-MIB MIB page.
IPHost Network monitor allows you to monitor cspPskcCertStartDate on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.