Hi guys, I'm looking to do the following and I was wondering how to use Date objects in Drools. This is what I currently have: rule "Difference between end and start time is less than a very small (threshold) value." *salience* 100 when *obs*: ObsClass((endTime - startTime) < someVerySmallValue) then System.out.*println*("Difference between end and start time is less than a very small (threshold) value."); End rule "Check if user defined time frame falls between startTime and endTime variables" *salience* 100 when *obs*: ObsClass((endTime - userDefinedTime) > 0 && (userDefinedTime - startTime) > 0) then System.out.println("Check if user defined time frame falls between startTime and endTime variables") end The problem I'm having with dates is in comparing them. The mathematical portion of the rules above kind of explain what I want to do but I doubt I'll be able to achieve my goals. Any help would be greatly appreciated. Thanks in advance, Armaghan