Question

How can I add +9 hours on my script below ? I don’t prefer to just add 9 hours to the correct time, for example if I want it 13:22:54 to make it 22:22:54 for this to work but on the script.

I create the unix timestamp in a php file doing

$end = mktime(16, 54, 0, 8, 18, 2011);

and the copy it below

Countdown Script

<script type="text/javascript">
var end_date = new Date(<?php echo $end; ?>*1000);

$(document).ready(function() {
    $("#time").countdown({
        date: end_date,
        onComplete: function( event ){
            $(this).html("completed");
        },
        leadingZero: true
    });
});
</script>

<p id="time" class="time"></p>

Answer 1

Instead of playing the heroes by trying to do time Math (and even failing badly), you should rely on native methods, available to both PHP and JS:

// gets the time 9 hours from now
// you can give a 2nd parameter to specify when is "now"
$date = strtotime('+9 hours');

and:

// get the time right now
var date = new Date()
// add 9 hours, don't worry about jumping the 24hr boundary, JS resolves correctly.
date.setHours(date.getHours()+9)

Edit:

Since the OP said he wanted to use a TS from DB, here’s the relevant code:

$date = strtotime('+9 hours', (int)$db_time);

Note: If $db_time is a formatted string, like “24 April 2011, 4:56 pm”, you need to put the following code before the one above:

$db_time = strtotime($db_time);

However, I urge you to check for alternative ways to parse the time.