[rules-users] using homemade Date in Drools

Hi, We are using a lot of Dates in our application but we use a homemade Date class for that. Therefore, we cannot use > and < provided by Drools. I looked through the mailing list but could not find any examples using Dates in Drools other than in the documentation. What interested me in particular in the documentation was "If more control is required, use the predicate constraint." Could someone give some examples of using predicate constraint with dates? Something I would like to do, for example, is the following : If there is an obj1 of class A with field of type Date d1 and another obj2 of class A with field Date d2, where d1 is before d2, obj2 should be used to fire something. rule XXX when obj : A( $date : mydate) // do not know how to use constraint on date here. then // something obj.doSomething(); end Thanks for your input.