CODEWITHSUNDEEP
jspdatejstl
CrazyProgrammer
CrazyProgrammer

Reputation: 544

Get first day of next and previous month in JSTL

I have to show first date of next and previous month, is there any way I can get it using JSTL. Pure JSTL is preferred.

I could get tomorrow as below.

<jsp:useBean id="ourDate" class="java.util.Date"/>
<jsp:setProperty name="ourDate" property="time" value="${ourDate.time + 86400000}"/>
<fmt:formatDate value="${ourDate}" pattern="dd/MM/yyyy"/>

I couldn't get the first day of month.

Upvotes: 0

Views: 1445

Answers (1)

BalusC
BalusC

Reputation: 1108802

JSTL has only tags to parse and format the date, not to manipulate the date. Your best resort is EL (those ${} things). Since Servlet 3.0 / EL 2.2 it supports method expressions in JSP as well. You could then use among others Calendar#set() and Calendar#add() methods. True, this is hacky, but as you asked for "pure JSTL", that's best you can get.

<jsp:useBean id="firstDayOfMonth" class="java.util.GregorianCalendar">
    ${firstDayOfMonth.set(5,1)}
</jsp:useBean>
<jsp:useBean id="firstDayOfPreviousMonth" class="java.util.GregorianCalendar">
    ${firstDayOfPreviousMonth.set(5,1)}
    ${firstDayOfPreviousMonth.add(2,-1)}
</jsp:useBean>
<jsp:useBean id="firstDayOfNextMonth" class="java.util.GregorianCalendar">
    ${firstDayOfNextMonth.set(5,1)}
    ${firstDayOfNextMonth.add(2,1)}
</jsp:useBean>

(those expressions are merely for self-documentary purposes nested inside the <jsp:useBean>, they can be placed outside, but it may be more confusing for starters; the first argument (5 resp. 2) is by the way value of the constant field Calendar.DAY_OF_MONTH and Calendar.MONTH)

Now you can present them as below via Calendar#getTime() the usual way:

<fmt:formatDate value="${firstDayOfMonth.time}" pattern="dd/MM/yyyy"/>
<fmt:formatDate value="${firstDayOfPreviousMonth.time}" pattern="dd/MM/yyyy"/>
<fmt:formatDate value="${firstDayOfNextMonth.time}" pattern="dd/MM/yyyy"/>

If you're not on EL 2.2 yet, then your best bet is preparing them in a servlet.

Upvotes: 1

Related Questions