question: private void verifyTimestamp ( X509Certificate cert ) throws CertPathValidatorException { String msg = "timestamp" ; if ( debug != null ) debug . println ( "---checking " + msg + ":" + date . toString ( ) + "..." ) ; try { cert . checkValidity ( date ) ; } catch ( CertificateExpiredException e ) { throw new CertPathValidatorException ( msg + " check failed" , e , null , - 1 , BasicReason . EXPIRED ) ; } catch ( CertificateNotYetValidException e ) { throw new CertPathValidatorException ( msg + " check failed" , e , null , - 1 , BasicReason . NOT_YET_VALID ) ; } if ( debug != null ) debug . println ( msg + " verified." ) ; }
target:  Internal method to verify the timestamp on a certificate