JSF - f:convertDateTime


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f:convertDateTime tag is used to convert a string value to a date of required format. It also acts as a validator, a required date format.

JSF Tag

<f:convertDateTime pattern = "dd-mm-yyyy" />

Tag Attributes

S.No Attribute & Description
1

type

date (default), time, or both

2

dateStyle

default, short, medium, long, or full

3

timeStyle

default, short, medium, long, or full

4

pattern

Formatting pattern, as defined in java.text.SimpleDateFormat

5

locale

Locale whose preferences are to be used for parsing and formatting

6 timeZone

Time zone to use for parsing and formatting

Example Application

Let us create a test JSF application to test the above tag.

Step Description
1 Create a project with a name helloworld under a package com.tutorialspoint.test as explained in the JSF - First Application chapter.
2 Modify home.xhtml as explained below. Keep the rest of the files unchanged.
3 Create result.xhtml in the webapps directory as explained below.
4 Create UserData.java as a managed bean under package com.tutorialspoint.test as explained below.
5 Compile and run the application to make sure business logic is working as per the requirements.
6 Finally, build the application in the form of war file and deploy it in Apache Tomcat Webserver.
7 Launch your web application using appropriate URL as explained below in the last step.

UserData.java

package com.tutorialspoint.test;

import java.io.Serializable;
import java.util.Date;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

@ManagedBean(name = "userData", eager = true)
@SessionScoped
public class UserData implements Serializable {
   private static final long serialVersionUID = 1L;
   public Date date;

   public Date getDate() {
      return date;
   }

   public void setDate(Date date) {
      this.date = date;
   }
}

home.xhtml

<?xml version = "1.0" encoding = "UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns = "http://www.w3.org/1999/xhtml"
   xmlns:h = "http://java.sun.com/jsf/html"
   xmlns:f = "http://java.sun.com/jsf/core">
   
   <h:head>
      <title>JSF tutorial</title>
   </h:head>
   
   <h:body>
      <h2>ConvertDateTime Example</h2>
      
      <h:form>
         <h:inputText id = "dateInput" value = "#{userData.date}"
            label = "Date" >
            <f:convertDateTime pattern = "dd-mm-yyyy" />
         </h:inputText>
         <h:commandButton value = "submit" action = "result"/>
      </h:form>
      <br/>
      <h:message for = "dateInput" style = "color:red" />
      
      <h:outputText value = "12-01-2012" >
         <f:convertDateTime pattern = "dd-mm-yyyy" />
      </h:outputText>
   
   </h:body>
</html>

result.xhtml

<?xml version = "1.0" encoding = "UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns = "http://www.w3.org/1999/xhtml"
   xmlns:f = "http://java.sun.com/jsf/core"
   xmlns:h = "http://java.sun.com/jsf/html"
   xmlns:ui = "http://java.sun.com/jsf/facelets">
   
   <h:body>
      <h2>Result</h2>
      <hr />
      #{userData.date}
   </h:body>
</html>

Once you are ready with all the changes done, let us compile and run the application as we did in JSF - First Application chapter. If everything is fine with your application, this will produce the following result.

JSF f:convertDateTime

Enter any invalid value and press Submit button. See the following error message.

JSF f:convertDateTime1

Enter any valid value and press Submit button. See the following result.

JSF f:convertDateTime2
jsf_convertor_tags.htm

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