What is actionPoller tag? This tag specifies a timer that sends an AJAX update request at specified interval. Minimum interval time to refresh is 5 sec.

Here in this post i am providing a simple example to explain about actionPoller.  I am calling a simple method from controller to display Date & TIme and recalling that method by using actionPoller tag to change the time for every 5 sesc. See the below code to understand how actionPoller will work.

Visualforce page Code:

<apex:page controller="actionpollerDemoController">
    <apex:form >
        <apex:pageBlock id="pb">
             <span style="color: #ff0000;" data-mce-style="color: #ff0000;"><strong><apex:actionPoller action="{!dateTimeMethod}" reRender="pb" interval="5"/></strong></span>
                     Hello!!!  Date and Time: <strong><span style="color: #ff0000;" data-mce-style="color: #ff0000;">{!dateAndTime}</span> </strong>
                     <p>Note: Time will refresh fror eevry 5 sec.</p>

Apex Controller:

public with sharing class actionpollerDemoController {

	public DateTime dateAndTime{

	public void dateTimeMethod(){
		dateAndTime =;


OutPut: In below screen rounded part will refresh for every 5 secs


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