So Dt is your parameter, and you are thinking of passing that into the connector rule to create your query? IF this is correct, then what I said is still valid. I don't know a way to pass the parameter to a connector rule. All I've seen is the ClientRequest call, and even that not sure where that is being passed. (it is in many rules, but they all fail to mention where that value is coming from).
Since you are looking for a date, can't you use the workflow you are loading and get it that way instead of passing it as a parameter?