public void setNotBefore(java.util.Date notBefore) {
        this.notBefore = notBefore;
    }
<p>
The timestamp when the SSL/TLS certificate is first valid.
</p>

@param notBefore
       The timestamp when the SSL/TLS certificate is first valid.
aws-java-sdk-lightsail/src/main/java/com/amazonaws/services/lightsail/model/LoadBalancerTlsCertificate.java