public String getEndingDateTime() {
        return StringUtils.isBlank(endingDateTime)
            ? null
            : SpringExpressionLanguageValueResolver.getInstance().resolve(endingDateTime);
    }
The {@link TimeBasedRegisteredServiceAccessStrategy} is responsible for
enforcing CAS authorization strategy based on a configured start/end time.

@author Misagh Moayyed
@since 4.2
core/cas-server-core-services-api/src/main/java/org/apereo/cas/services/TimeBasedRegisteredServiceAccessStrategy.java