protected boolean isIssueInstantValid(final Instant issueInstant) {
        return isDateValid(issueInstant, 0);
    }
<p>isIssueInstantValid.</p>

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