hi I have got the answer of above question in drools documentation . drools global variables are immutable . now i have inserted this object into memory as control . rule myrule 1 when $ct: control ( $t : timeTo) $m : Medicine(expiryDate < ($t - 60000)) then retract($m) end but it takes more time then this rule myrule2 .functionality wise working fine . rule myrule 2 when $m : Medicine (expiryDate <( System.currentTimemillis() -600000)) then retract($m); end but i can not take time as System.currentTimemillis() in myrule1 medicine fact type does the cartisian product with control . but control is single and each time i update it . So what am i doing wrong ? or somewhere i am conceptually wrong Plz help me if u have any idea about this . Regards Saurabh -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/drools-global-variabl... Sent from the Drools - User mailing list archive at Nabble.com.