Making a signed JAR that expires

How can I make a signed JAR that expires in a week, therefore, not letting anyone launch the program after a week?
[121 byte] By [ChromoXNHa] at [2007-11-27 2:04:53]
# 1
A time bomb?
wangwja at 2007-7-12 1:49:32 > top of Java-index,Security,Signed Applets...
# 2
Yeah sure if you want to call it that.
ChromoXNHa at 2007-7-12 1:49:32 > top of Java-index,Security,Signed Applets...