protected void validateIssueInstant(final Instant issueInstant) {
        if (!isIssueInstantValid(issueInstant)) {
            throw new SAMLIssueInstantException("Issue instant is too old or in the future");
        }
    }
<p>validateIssueInstant.</p>

@param issueInstant a {@link Instant} object
pac4j-saml/src/main/java/org/pac4j/saml/profile/impl/AbstractSAML2ResponseValidator.java