public InstanceGroupDetail withReadyDateTime(java.util.Date readyDateTime) {
        setReadyDateTime(readyDateTime);
        return this;
    }
<p>
The date/time the instance group was available to the cluster.
</p>

@param readyDateTime
       The date/time the instance group was available to the cluster.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/InstanceGroupDetail.java