var taskId = args["taskId"];
var transitionId = args["transitionId"];
var task = workflow.getTaskById(taskId);
var futureDate = new Date();
futureDate.setDate(futureDate.getDate() + 7);
// What do I do here, there is no setProperty or anything like it that I can find?
// task.setProperty("bpm:workflowDueDate", futureDate);