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.

Alex Polonski

Smart Countdown FX key features:
<ul>
<li>
years and months (along with “traditional” weeks, days, hours, minutes and seconds) can be displayed in the countdown interval.
</li>
<li>
counter digits changes are animated and site administrator can easily switch between available <a href="http://wp.smartcalc.org/category/animation-profiles/" rel="nofollow ugc">animation profiles</a>, included with the plugin or added later.
</li>
<li>
event <a href="http://wp.smartcalc.org/category/event-import-plugins/" rel="nofollow ugc">import plugins</a> support, no need to manually edit widget settings or shortcode for recurring or calendar events.
</li>
</ul>
Other features
Smart Countdown FX can show both countdown and count up counters, and it will switch to the “count up” mode automatically when the event time arrives. Event description can be configured individually for countdown and count up modes and can containt HTML markup allowed for a post.
Smart Countdown FX supports different layouts. Most popular layouts (sidebar, shortcode, shortcode compact, etc.) are included in the package and can be selected in the widget options or using a shortcode attribute. Custom layout presets can be easily created using existing ones as a starting point. You will find detailed instructions in the documentation.
RTL languages are natively supported in all counter layouts.
Smart Countdown FX widget is responsive. Open “Responsive” page on different handheld devices or just change your browser window width if you are on a desktop to see the feature in action.
More than one countdown can be displayed on the same page, each instance with its individual settings and configuration.
Events import plugins are supported.
<a href="http://wp.smartcalc.org/" rel="nofollow ugc">Project home page</a>
Coming soon
<ul>
<li>
More event import plugins for popular event management plugins and services.
</li>
<li>
More animation profiles.
</li>
</ul>

Smart Countdown FX

Smart Countdown FX displays a responsive animated countdown. Supports years and months display and recurring events

The Countdown – Block Countdown Timer vs Smart Countdown FX