Display Date and Time on the front page of Drupal

create custom block .. with php code that shows date.. i think there is not any default functionality with Drupal to show date and time on Front Page.

make your self an html block with the following, and place that block where ever you want.

<div  onload="updateDateTime();">
	 <span id="date">&nbsp;</span><br/>
 	 <span id="time">&nbsp;</span>
	 </div>
	 <script type=text/javascript>
	 function updateDateTime ( )
	 {
	   var currentTime = new Date ( );
	   
	   var currentDay = currentTime.getDay ( );
	   var currentDate = currentTime.getDate ( );
	   var currentMon = currentTime.getMonth ( ) + 1;
	   var currentYr = currentTime.getFullYear ( );
	   var currentHours = currentTime.getHours ( );
	   var currentMinutes = currentTime.getMinutes ( );
	   var currentSeconds = currentTime.getSeconds ( );

	   // Pad the minutes and seconds with leading zeros, if required
	   currentMinutes = ( currentMinutes < 10 ? "0" : "" ) + currentMinutes;
	   currentSeconds = ( currentSeconds < 10 ? "0" : "" ) + currentSeconds;
	   currentHours = ( currentHours < 10 ? "0" : "" ) + currentHours;
	   currentDate = ( currentDate < 10 ? "0" : "" ) + currentDate;
	   currentMon = ( currentMon < 10 ? "0" : "" ) + currentMon;
  
	   // Choose either "AM" or "PM" as appropriate
	   var timeOfDay = ( currentHours < 12 ) ? "AM" : "PM";

	   // Convert the hours component to 12-hour format if needed
	   currentHours = ( currentHours > 12 ) ? currentHours - 12 : currentHours;
	   if ( currentDay == 0 ) {
	       currentDay = "Sun" ;
	   } ;
	   if ( currentDay == 1 ) {
	       currentDay = "Mon" ;
	   } ;
	   if ( currentDay == 2 ) {
	       currentDay = "Tue" ;
	   } ;
	   if ( currentDay == 3 ) {
	       currentDay = "Wed" ;
	   } ;
	   if ( currentDay == 4 ) {
	       currentDay = "Thu" ;
	   } ;
	   if ( currentDay == 5 ) {
	       currentDay = "Fri" ;
	   } ;
	   if ( currentDay == 6 ) {
	       currentDay = "Sat" ;
	   } ;
	   // Convert an hours component of "0" to "12"
	   currentHours = ( currentHours == 0 ) ? 12 : currentHours;

	   // Compose the string for display
	   var currentTimeString = currentHours + ":" + currentMinutes + ":" + currentSeconds + " " + timeOfDay;
	   var currentDateString = currentDay + " " + currentMon + "-" + currentDate + "-" + currentYr

	   // Update the time display
	   document.getElementById("time").firstChild.nodeValue = currentTimeString;
	   document.getElementById("date").firstChild.nodeValue = currentDateString;
	 }
	 updateDateTime();
	 setInterval("updateDateTime()", 1000 );
	 </script>

I don't see creating a block to host the current date as an overkill; it's a perfectly legit use of Drupal's blocks, IMHO.

The simpler solution is to create a custom block that contains a simple call to Drupal's built-in formate_date() function. You just need to supply the PHP's time() function as its first argument. You may wrap all the code into a function to avoid name collisions, and of course you need to enable the PHP Filter module from the modules page. Paste the following code in the Body textarea, and use PHP code from the Input formats collapsible group:

function current_date_front() {
  $now = time();
  $output = '';
  $output .= formate_date($now);
  return $output;
}
print current_date_front();

Give the block a name and description, and set it to show only on the front page using <front> as a value in the page specific visibility settings section.

Another approach as some has noted, is to use preprocess functions to add a variable to the page.tpl.php template and just print it where you would want in the template's code.

In both cases, using the Drupal's built-in and versatile format_date() allows you to customize the output of the date to your liking, make sure to consult the documentation and the API for instructions on how to leverage that function.

Actually using a block could be more appropriate if you're using caching on your site and is concerned when the block or page (depends on which approach you use) is cached and thus does not display the correct current date.

The solution to this is to write a custom module that defines a block and set that block cache item to -1, which prevents caching the block even when caching on the website is turned on. Setting a block caching is not provided by the front-end block administration page in Drupal.

This is a jQuery clock. Just add the js file and <div id="clock"></div> to your page.tpl.php

http://code.google.com/p/epiclock/

Check this module Clock module for Drupal 6&7

The team here were looking to do this and did not want to enable PHP to do this (as that opens up all sorts of security issues).
It is very possible to edit the template .. but if you don't want to do that then you can Javascript quite easily like this:

<h2 class="text-align-center"><strong>Welcome&nbsp;-&nbsp;<span id="date-today">&nbsp;</span></strong></h2>
<script>
var m_names = new Array("January", "February", "March", 
"April", "May", "June", "July", "August", "September", 
"October", "November", "December");
var d = new Date();
var curr_date = d.getDate();
var curr_month = d.getMonth();
var curr_year = d.getFullYear();
document.getElementById("date-today").innerHTML = (curr_date + " " + m_names[curr_month] + " " + curr_year);
</script>

You can format the date (and time if you need) using some neat Javascript.
This site will show you how: http://www.webdevelopersnotes.com/javascript-date-and-time
Hope that helps.
The ChilledWeb Team.