Hey, I have a use case where we need to retroactively process data using rules, but with the rules that were effective at the time the data was created (maybe a year ago), not at the time the data is run through the engine (today). We are setting effective and expiration dates on our rules to accomplish this. I am now trying to figure out how to control the date the agenda sees against which it evaluates which rules are in effect. I understand the TimeMachine class is part of this control mechanism but I am not sure how to properly use it in the context of a session. We may have multiple stateless sessions executing at the same time and each session needs its own independent control over its date parameter. Thanks HC -- View this message in context: http://n3.nabble.com/How-to-use-Drools-5-TimeMachine-for-controlling-effe... Sent from the Drools - User mailing list archive at Nabble.com.