[rules-users] Matching time diff

Hi listers, I have a fact MyFact that has a Date field in it, and I want to check if the difference between this date and the current date is greater than 10 seconds: The function timediff() returns the difference in seconds between a date and the current date. Rule: rule myRule when fact : MyFact(date : fact, eval(timediff(date) > 10)); then System.out.println("Greater than 10 seconds"); end When I fire the rules, and the difference is less than 10 seconds nothing happens. The next time that I fire the rules and the difference is greater than 10 seconds nothing happens as well. How can I make this work? Best regards, Miguel