To Timestamp a Java Applet with a DigiCert Code Signing Certificate for Sun Java using JDK 1.6.0, perform the following steps:
DigiCert now has access to the new RFC3161-compliant DigiCert timestamp server. Therefore it is now possible to timestamp Java applets when signing using JDK 1.6 or above.
The RFC 3161 Timestamp URL is: http://timestamp.digicert.com
The command to use to correctly sign and timestamp Java code is:
jarsigner -tsa http://timestamp.digicert.com -keystore <keystore_filename> <path to Applet (ie. C:TestApplet.jar)> <alias_name>