With this pluging you can add a countdown to your blog. Just specify an end-date in the settings (backend) and put one single line of php-code somewhere you want this countdown to be displayed. This plugin uses the ajax-technology for updating the countdown every second. The moment you change the specified date in the settings, the plugin recognizes this change and updates itself according to the new date.

COUNTdown

This plugin allows you to add an ajax-updated countdown to your blog.

Alex Polonski

Smart Countdown FX Easy Recurring Events requires <a href="https://wordpress.org/plugins/smart-countdown-fx/" rel="ugc">Smart Countdown FX</a> version 1.3 or higher, please do not forget to update before proceeding.
Up to four independent recurrence patterns can be defined. Supported patterns are:
<ul>
<li>
Hourly – every 10, 15, 20 or 30 minutes, 1, 2, 3, 4, 6, 8 or 12 hours starting from a given time
</li>
<li>
Daily – every day at a given time
</li>
<li>
Weekly – every week on chosen week days (more than one day can be selected) at a given time
</li>
<li>
Monthly – every month on a given date at a given time
</li>
<li>
Monthly by week day – every month on a given week and day (e.g. first monday, last saturday, second friday, etc.)
</li>
<li>
Yearly – every year on a given month and date at a given time
</li>
</ul>
Other features
When configuring Smart Countdown FX or adding a shortcode to you post you can choose one of or both recirrence patterns defined in “Smart Countdown FX Easy Recurring Events” configuration. The opition to use both patterns will merge events from each recurrence into a single timeline. Of course you can merge any kind of patterns but mostly this feature serves for creating different schedules for week days and weekends in a combined “Weekly” pattern.
All events in a recurrence pattern have the same duration which can be set in “Duration” option in plugin configuration. When recurring events are imported the widget will show countdown to the next scheduled event and after event starts it will show “In progress” (or whatever title you set for “count up” mode) while event is in progress (i.e. during the interval set as “Duration”). After that the counter will automatically start countdown to the next event.
Overlapping events are also supported.
For samples and complete list of features <a href="http://wp.smartcalc.org/recurring-events/" rel="nofollow ugc">see this page</a>

Smart Countdown FX Easy Recurring Events

Smart Countdown FX Easy Recurring Events adds recurring events support to Smart Countdown FX.

COUNTdown vs Smart Countdown FX Easy Recurring Events