public ReservedInstancesModification withEffectiveDate(java.util.Date effectiveDate) {
        setEffectiveDate(effectiveDate);
        return this;
    }
<p>
The time for the modification to become effective.
</p>

@param effectiveDate
       The time for the modification to become effective.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/ReservedInstancesModification.java