Is it possible to add a timestamp when I'm creating new signed applet.
There is a problem with the signing that after the validity period there is a warning message that the certificate is out of the date. (I never want this warning dialog, I'm signing the applet when the certificate is valid!)
Supposedly, you can specify the number of days that a cert should be valid. If you don't specify, it uses the default - which is probably what it got when it was originally created.
When you are running keytool with the '-genkey' option you should be able to also use the '-validity' option which is a number of days for the cert to be valid. Don't know what the upper limit is. Perhaps try a huge number. It might just blow out the genkey if it is beyond is valid range of values.