public void setNotBefore(Instant notBefore) {
        addAuthenticationAttribute(SAML2Authenticator.SAML_CONDITION_NOT_BEFORE_ATTRIBUTE, notBefore);
    }
<p>setNotBefore.</p>

@param notBefore a {@link Instant} object
pac4j-saml/src/main/java/org/pac4j/saml/profile/SAML2Profile.java