Show the date and time when an X.509 certificate expires.
Each X.509 has a range of certificate validity times. This method returns the X.509 'notAfter'
field formatted as a 'POSIXct'
date value.
getCertExpires(x, ...) ## S4 method for signature 'CertificateManager' getCertExpires(x)
x
: a CertificateManager instance...
: (Not yet used)POSIXct value