ActionScript for Flash MX: The Definitive Guide, 2nd Edition By Colin Moock
Chapter 18. ActionScript Language Reference
Date.valueOf( ) Method
Flash 5
the number of milliseconds between January 1, 1970 and the time of the Date object
date.valueOf()
Returns
An integer expressing the number of milliseconds between the time of the Date object and midnight, January 1, 1970 positive if after January 1, 1970; negative if before.
Description
In practice, Date.valueOf( ) is equivalent to Date.getTime( ).