jCountdown is a highly customizable jQuery plugin, you can easily to use it on your site, you can try some different setting at preview page, and check all properties and methods at below
check the WordPress Plugin here jCountdown Mega Package for Wordpress
Update Log
v1.1.1 02/12/2012 fix bug about can’t correctly parse some timeText format v1.1 27/11/2012 add new properity width and displayLabel, and now texts won’t warp, all texts will display in one line
Properities
timeText (String) – Year/Month/Date Hour:Minute:Second
timeZone (Number) – GMT number
style (String) – Flip, Slide, Metal or Crystal
color (String) – Black or White
width (Number) – 0 ~ n (unlimited, default 0) (if you don’t want to resize, it please set it to 0)
textGroupSpace – (Number) 0 ~ n (unlimited, default 15)
textSpace – (Number) 0 ~ n (unlimited, default 0)
reflection – (Boolean) true or false (default true) (this setting works in Firefox, Chrome, Safari, Opera and most mobile browser)
reflection Opacity – (Number) 0 ~ 100 (default 10) (this setting works in Firefox, Chrome, Safari, Opera and most mobile browser)
reflection Blur – (Number) 0 ~ 10 (default 0) (this setting works in Firefox, Chrome, Safari and most mobile browser)
dayTextNumber – (Number) 2 ~ n (unlimited, default 2)
displayDay – (Boolean) true or false (default true)
displayHour – (Boolean) true or false (default true)
displayMinute – (Boolean) true or false (default true)
displaySecond – (Boolean) true or false, (default true)
displayLabel – (Boolean) true or false, (default true)
onFinish – (function) execute some script when time’s up
Methods
create – create countdown
destroy – destroy countdown
stop – stop countdown
start – start countdown