I'm wanting to create a simple live countdown timer on a website using Flash. So far I know to use the Date & Time object and I set it to Countdown mode.

My issue is assigning the countdown start time. Instead of using the sliders to select the parameters I know I need to create an expression.

When using a calculation it says to enter in 1/1000th of a second. I know how to get the year, month, and so forth by clicking Retrieve Data From Object and selecting info from the Date & Time object but how do I convert the countdown date to 1/1000th of a second or what is the format to input that into in the expression editor.

Say I wanted to countdown till December 25, 2011.