Feature request to support is_date for LocalDate

[faltfe]

I stumbled about a problem that the build-in is_date does not support Java 8 time objects like LocalDate.

Let me try to show you my usecase

<#if myDate?is_date>true<#else>false</#if>

Map<String, Object> placeholders = new HashMap<>();
placerholders.put("mydate", LocalDate.now());
FreeMarkerTemplateUtils.processTemplateIntoString(template, placeholders);

When I replace LocalDate.now() with new Date() it is working. Is there any possibility to check with your library if a LocalDate is a date?