modifier.setClientName( getPrincipalName( "hnelson" ) );
modifier.setServerName( getPrincipalName( "krbtgt/EXAMPLE.COM@EXAMPLE.COM" ) );
modifier.setRealm( "EXAMPLE.COM" );
modifier.setEType( config.getEncryptionTypes() );
KdcOptions kdcOptions = new KdcOptions();
kdcOptions.set( KdcOptions.ALLOW_POSTDATE );
modifier.setKdcOptions( kdcOptions );
long now = System.currentTimeMillis();
KerberosTime requestedEndTime = new KerberosTime( now + 1 * KerberosTime.DAY );
modifier.setTill( requestedEndTime );