//SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd a hh:mm:ss");
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd a hh:mm:ss",Locale.KOREA);
java.util.Date date = sdf.parse(articleForm.getDate());
String strDate = sdf.format(date);

<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<fmt:setLocale value="ko_KR"/>
<fmt:formatDate value="${comment.date}" pattern="yyyy-MM-dd a hh:mm:ss"/>