public DescribedCertificate withNotBeforeDate(java.util.Date notBeforeDate) {
        setNotBeforeDate(notBeforeDate);
        return this;
    }
<p>
The earliest date that the certificate is valid.
</p>

@param notBeforeDate
       The earliest date that the certificate is valid.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-transfer/src/main/java/com/amazonaws/services/transfer/model/DescribedCertificate.java