JSTL 날짜형식 출력

<%@ taglib prefix="fmt"  uri="http://java.sun.com/jsp/jstl/fmt"%><!-- 필수 -->

20170101 형식

<fmt:parseDate var="dateString" value="${sdt}" pattern="yyyyMMdd" />

2017.01.01 형식

<fmt:formatDate value="${dateString}" pattern="yyyy.MM.dd" />

20170101235959 형식으로 dateString에 담기. (년월일 시분초)

<fmt:parseDate var="dateString" value="${sdt}" pattern="yyyyMMddHHmmss" />

파싱후 문자열값: <fmt:formatDate value="${dateString}" pattern="yyyy.MM.dd HH:mm:ss" />

날짜 차이 계산

<c:set var="sdate" value="2017.01.15" />

<c:set var="edate" value="2017.01.22" />

<fmt:parseDate var="sDate" value="${sdate}" pattern="yyyy.MM.dd" />

값 확인 : <fmt:formatDate value="${sDate }"  pattern="yyyyMMdd" />

<fmt:parseNumber value="${sDate.time / (1000*60*60*24)}" integerOnly="true" var="sDays" scope="request" />

<fmt:parseDate var="eDate" value="${edate}" pattern="yyyy.MM.dd" />

값 확인 : <fmt:formatDate value="${eDate }"  pattern="yyyyMMdd" />

<fmt:parseNumber value="${eDate.time / (1000*60*60*24)}" integerOnly="true" var="eDays" scope="request" />

${eDays - sDays}일

출처 http://wlsufld.tistory.com/34