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Javascript Countdown allows to insert a countdown anywhere on your WordPress website.
The Javascript Countdown is fully customizable from your WordPress admin. There, you can personalize the date, time, the format of the countown and the final message. You can even include any HTML you want !

Javascript Countdown

A fully customizable Javascript countdown

With this plugin you can set up a countdown timer – or even multiple – on a page. The timer will count down until the given date and show the alternative content.
This plugin is great for use on sales pages and product launches or discounts, it gives a sense of tension to the visitor.
This plugin does not use an admin page, everything is done with a few simple shortcodes.
Usage:
<pre><code>[countdown date="18:00:00 08/30/2009"]
This page goes live in about: [counter]
[after]
Enter your secret content here
[/countdown]
</code></pre>
Note that dates are UTC and that alternative content is not send to the browser until the date passed.

WordPress Countdown Plugin

Add a countdown timer to any page hiding content until the date passes.

Javascript Countdown vs WordPress Countdown Plugin