You can display expiration dates of certificates in your key database by viewing the certificate information with the IKEYMAN Key Management utility GUI or using the gsk7cmd command.
gsk7cmd -cert -list all -expiry 1825 -db key.kdb -pw <password>
Certificates in database: key.kdb VeriSign Class 1 CA Individual Subscriber-Persona Not Validated Validity Not Before: Mon May 11 20:00:00 EDT 1998 Not After: Mon May 12 19:59:59 EDT 2008where <password> is the password you specified when creating the key.kdb key database file.