I recently came across this cool plugin for jQuery, which lets you make quick “countdown” clocks for your website. This could be for many reasons, to name a few:
The list goes on You can even do “count ups”, i.e since the date your site was launched, or when an event started, etc.
You can download this plugin from here: http://keith-wood.name/countdown.html
I love the way this plugin is so flexible. For example, checkout the different formats you can use. Text, images, text in pretty muhc whatever format you want; setting the date format, etc