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T(-) Countdown is a customisable countdown timer that can display years (optional), months (optional), weeks (optional), days, hours and seconds. This plugin is the next generation of T(-) Countdown Widget. Note: a dedicated sidebar widget is not included as shortcodes can now be used in most sidebars.

T(-) Countdown

Display and configure multiple countdown timers in years, months, weeks, days, hours and seconds in a number of different styles.

flexostudio

Countdown Clock 
see: http://www.flexostudio.com/
<h3>How to use</h3>
1.Going by the settings in the administration and data entry required to start the clock. Generate code and copy it and put the desired location and you’re done. 
or 
2. paste the following code to the desired location in the code of your page: 
example: 
 $con='[flexocounter endDate=”30.09.2011 10:30″ url=”http://google.com” header=”text” footer=”text”]’; 
 flexoCounter::the_content($con); 
$con generate in the administration too

T(-) Countdown vs Flexo Counter