[rules-users] Define a time event

Hi everyone, i'm using drools in .net version. I'd want that at a certain hour a rule has to be fired. For example: when Time(hour==22,minute==0) Lamp(status==1) then Console.Writeline("It's late,turn off the light and go to bed") where time is a class that return the current hour; I've tried this code but nothing happens at 22.00. Is there any solution, or i have to use an external class timer and execute fireAllrules command for the hour that i'm interesting for? Please,can somebody help me?? Cla