Miriam de Paula

WP Coming Soon is a plugin that adds a countdown clock in the Coming Soon page. This plugin uses Keith Wood jQuery plugin. See it at: http://keith-wood.name/countdown.html.
[BASIC USAGE]
Put this <code>if ( function_exists('get_countdown')) get_countdown();</code> where you want to display the countdown clock…
If you want to use the countdown timer within a page or page template, you can use the shortcode <code>[wp_coming_soon]</code>

WP Coming Soon

WP Coming Soon is a simple plugin that adds a countdown clock in your Coming Soon page... Nothing more!

IP2Location

Simple widget to display analog or digital clock on your website without much hassle. IP2Location world clock gives you a range of different clock designs which is absolutely free. Supported local time, visitor’s time and custom time zone selection.
<h4>Features</h4>
<ul>
<li>World clock widget enable you to easily embed into your website in anywhere</li>
<li>46 different clock designs to choose from and the list is still growing</li>
<li>3 option of time selection (local time, visitor’s time and custom time zone).</li>
<li>Support 12 hour or 24 hour time format for digital clock.</li>
<li>Can be added via shortcode [ip2location_world_clock], please refer FAQ section for shortcode parameters.</li>
</ul>

IP2Location World Clock

Simple world clock widget to display analog or digital clock for multiple time zone on your site. Supported local time, visitor's time and custom …

WP Coming Soon vs IP2Location World Clock