public S3CopyObjectOperation withUnModifiedSinceConstraint(java.util.Date unModifiedSinceConstraint) {
        setUnModifiedSinceConstraint(unModifiedSinceConstraint);
        return this;
    }
<p/>

@param unModifiedSinceConstraint
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-s3control/src/main/java/com/amazonaws/services/s3control/model/S3CopyObjectOperation.java