there is no HTML code for a countdown timer...
it does not exist, html is only wrappers to define the meaning of words with special rules and regulations.
JavaScript, PHP, Flash can do this on the other hand
javascript and flash do it best
javascript will show normal letters counting
flash will show fancy looking countdown timer
to create a javascript based countdown timer you only need a notepad
to create a flash based countdown timer you need a flash editing program
you can download "made" flash, javascript and php countdown timers and specify the date that they should count to.
flash will be a separate file that will be embedded into the HTML
like this
<object width="550" height="400">
<param name="movie" value="somefilename.swf">
<embed src="somefilename.swf" width="550" height="400">
</embed>
</object>
javascript is a bit of code in the HTML that will count
its easily embedded into html
<script type="text/JavaScript">
your script here...
</script>
you could use php or asp in the javascript case to "remember" the date to which the programs need to count
(maybe even for flash...)
aka read the date from a file (i think javascript can do that too)
i would give the code just like that, but i'm afraid its not that simple...and i don't really have it on me...and it needs lots of background knowledge
if i was you i would just create one myself
ill pm (personal message) you with the code if i get my hands on it if you want to...