zourbuth

The countdown functionality can easily be added to your block or sidebar. With counting down and up functionality, gives you a full control to your counter. 
This plugin comes with bunch of timer option such as the ability to count up/down or even do relative time. 
There are many tempates available with lot of styles for each template that can be customized easily.
<h3>Key Features & Options</h3>
<ul>
<li>Date Picker for your until, since or relative counter.</li>
<li>Date Format easy to use custom date format for display.</li>
<li>Expiry option to show message, redirect to an URL or even run JavaScript function.</li>
<li>Custom labels the display texts for the counters, singular, plural name.</li>
<li>Builtin template with lots of style options.</li>
</ul>
<h3>Supports & Features</h3>
This plugin does not match to your site style? Is this script not quite working as it should? 
Having trouble installing? Or need some custom modifications that aren’t already included? 
Or you want more features on next release? 
Feel free to get in touch about any of your queries via <a href="https://wordpress.org/support/plugin/the-countdown/" rel="ugc">plugin support forum</a>.

The Countdown – Block Countdown Timer

A plugin for displaying counter for your site and do action after or before it hit the expiration.

anou

The Before You Are Dead (BYAD) Countdown provides a simple widget witch displays a countdown timer with Days, Hours, Minutes, Seconds and optionally, Years. You can configure some settings: Final date, Final time in the day, Final date format, Your final words and Years display.
<h4>Plugin Features</h4>
<ul>
<li>You can display the BYAD Countdown via:
<ul>
<li>a Widget</li>
<li>a Shortcode</li>
</ul>
</li>
<li>
BYAD Countdown implements some filters to use with add_filter() function:
<ul>
<li>byad_date_data > array( byadRegional, byadIcon) for jquery datepicker in admin. Useful for localization. Default in french. (see – byad-settings.php – around line 131). Check code example in <a href="https://plugins.svn.wordpress.org/before-you-are-dead-countdown/trunk/help-code.txt" rel="nofollow ugc">help-code.txt</a> file.</li>
<li>byad_title > filter for the widget title output. (see – byad-countdown_widget.php – around line 25)</li>
<li>byad_timezone > to set timezone for date php functions. Default: ‘Europe/Paris’. (see – byad-countdown_widget.php – around line 42)</li>
<li>byad_jsdata > to configure data passed to the main – byad-countdown.js – file displaying and activating your “last time of life”. (see – byad-countdown_widget.php – around line 53)</li>
</ul>
</li>
<li>
You can also:
<ul>
<li>use your own css using this simple action hook: byad_stylesheet.</li>
<li>use your own datepicker JS language file using this other action hook: byad_datepicker_lang.</li>
<li>Check examples in <a href="https://plugins.svn.wordpress.org/before-you-are-dead-countdown/trunk/help-code.txt" rel="nofollow ugc">help-code.txt</a> file.</li>
</ul>
</li>
</ul>
<h3>Localizations</h3>
BYAD Countdown distributes with translations for the following languages: 
* English 
* Français 
* Italiano
Don’t see your language on the list? 
There is a – byad-countdown-default.po – in the languages/ directory. 
Use it with <a href="http://www.poedit.net/" rel="nofollow ugc">Poedit</a> as a base .PO file for your language. 
Save it as: byad-countdown-LANGCODE.po where LANGCODE is your language code (e.g. fr_FR). 
If you create any, I’ll be glad to include it in the plugin.
<ul>
<li><a href="http://fr.termwiki.com/TWSpecial:ISO_Language_Code_Comparison" rel="nofollow ugc">Link to Languages Codes</a></li>
<li>Link to the excellent <a href="http://www.poedit.net" rel="nofollow ugc">Poedit software</a></li>
<li>See also my <a href="https://plugins.svn.wordpress.org/before-you-are-dead-countdown/trunk/help-code.txt" rel="nofollow ugc">help-code.txt</a> file for more info.</li>
</ul>

Before You Are Dead Countdown

Everybody using this plugin must be dead... So even if I'm the plugin's author, I must say, you don't really die at the end of this countdown!

Alone and counting

The Before You Are Dead (BYAD) Countdown provides a simple widget witch displays a countdown timer with Days, Hours, Minutes, Seconds and optionally,  …

The Countdown – Block Countdown Timer vs Before You Are Dead Countdown