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    <p>Here's a solution that uses <a href="http://keith-wood.name/countdown.html" rel="nofollow">a countdown plugin for jQuery</a>. Download the <a href="http://keith-wood.name/zip/jquery.countdown.package-1.5.9.zip" rel="nofollow">jQuery Countdown plugin</a>, and place <code>jquery.countdown.css</code> and <code>jquery.countdown.min.js</code> in the same folder as your file (or elsewhere, and adjust the paths in the code below). In the head section of your document include this:</p> <pre><code>&lt;script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="jquery.countdown.min.js"&gt;&lt;/script&gt; &lt;style type="text/css"&gt;@import "jquery.countdown.css";&lt;/style&gt; </code></pre> <p>Somewhere in the PHP code, before anything is outputted, run this to set when the time will be:</p> <pre><code>if (!isset($_COOKIES['endtime'])) { $endtime = time() + 28800000; setcookie('endtime', $endtime); } else { $endtime = $_COOKIE['endtime']; } </code></pre> <p>Then, where you want the timestamp to appear, output this HTML:</p> <pre><code>&lt;span class="countdown hasCountdown" id="myCountdown"&gt;&lt;/span&gt; </code></pre> <p>And somewhere after it, output this JavaScript:</p> <pre><code>var targetDate = new Date(&lt;?php echo ($endtime ); ?&gt;); $('#myCountdown').countdown({until: targetDate}); </code></pre> <hr> <p><strong>EDIT</strong>: Alright, here are some improvement on my previous answer to include pausing when the user leaves the page. I'm also switching the post over to community wiki so anyone is welcome to edit and improve it.</p> <p>In order to track when the user was last on the page, you need to keep a cookie that you update every 5 seconds or so with the current time. Here's a bit of JavaScript that does just that:</p> <pre><code>function setCookie(c_name, value, exdays) { var exdate = new Date(); exdate.setDate(exdate.getDate() + exdays); var c_value = escape(value) + ((exdays==null) ? "" : "; expires="+exdate.toUTCString()); document.cookie = c_name + "=" + c_value; } function updateCookie() { var curTime = new Date(); setCookie('lastvisit', curTime.getTime(), 30); setTimeout("updateCookie()", 5000); } </code></pre> <p>You need to run <code>updateCookie()</code> once and then it will keep running every five seconds. To have it run for the first time as soon as the page has finished on loading, add an onLoad to your body tag, like this:</p> <pre><code>&lt;body onLoad="updateCookie()"&gt; </code></pre> <p>Your PHP code will then look like this instead of the one above:</p> <pre><code>if (!isset($_COOKIES['lastvisit']) || !isset($_COOKIES['endtime'])) { $endtime = (time()*1000) + 28800000; setcookie('endtime', $endtime, time() + 2592000); } else { $prevendtime = $_COOKIE['endtime']; $lastvisit = $_COOKIE['lastvisit']; $timeleft = $prevendtime - $lastvisit; $endtime = (time()*1000) + $timeleft } </code></pre> <p>All the cookies are set to expire after 30 days, so if your user stays away for more than 30 days they will reset.</p>
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    1. COThat is not secure. It allows the user to freely change the countdown number, which could be trial time for some paid service. Which is hardly the result I would want on my script.
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    2. COThe asker hadn't specified that it should be secure, and since the purpose wasn't specified, I assumed that security wasn't necessary, so I went with the simplest situation and the only one that doesn't involve using server-side storage space. There's plenty of situations where it's okay for the user to be able to change it (for example, a countdown to the user's birthday, or a countdown to the release of a new product, etc.) and really not that many where security *is* needed.
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    3. COSecurity would not really be needed, in fact letting the user change the number would be preferable.
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