Date arithmetic in “when” session

 

I am trying to subtract hours from date and compare with
another date with
in "when" section, subtracting any value from date
giving me compilation
errors. Only the way i could achive this writing drl file
as:


dialect "java"
	//   Rule: Flight.departure – 2 hours <
LowFareRequest.departure
	//        > Flight.departure + 4 hours 
	// then set  AirItinerary.discarded = true

rule "ITR Discard"
when
    	$req : LowFareRequest()
    	$itr : AirItinerary( discarded == false )
     	$flight : Flight()
 then
        if((($flight.getDeparture().getTime() - 2 * 3600000)

            < $req.getRequestedDeparture().getTime()) 
            &&
            ($req.getRequestedDeparture().getTime()
              > $flight.getDeparture().getTime() + 4 *
3600000))
            System.out.println("discard true");
        else
        	System.out.println("discard false");
end

I am new user to drools, executing if with in then session
nullifies when
clause. 

how else i can do the above? 

TIA

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